ST TDA7541B User Manual

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AM/FM car radio tuner IC with stereo decoder

Features

■ FM part

– AGC generation by RF and IF detection – I/Q mixer for 1

rejection –Mixer for 2 – Internal 450 kHz band pass filter with

bandwidth control by ISS – Fully integrated FM demodulator with noise

cancellation

■ AM part

– Wide and narrow AGC generation –Mixer for 1

conversion –Mixer for 2 – Integrated AM-demodulator – AM IF noise blanking

■ Stereo decoder

– PLL with adjustment free, fully integrated

VCO – Automatic pilot dependent

MONO/STEREO switching – Programmable ROLL-OFF compensation – High cut and stereo blend-characteristics

programmable – Dedicated RDS mute – Audio noise blanker

■ Additional features

– VCO for world tuning range

Table 1. Device summary

IF 10.7 MHz with image

IF 450 kHz

IF 10.7 MHz, AM up

IF 450 kHz

TDA7541B

and intelligent selectivity system

LQFP64

– High performance fast PLL for RDS-

System

– IF counter for FM and AM with search stop

signal

– Quality detector for level, deviation,

adjacent channel and multipath

– ISS (Intelligent selectivity system) for

cancellation of adjacent channel and noise

influences – Adjacent channel mute – Fully electronic alignment – Independent weather band input – All functions I

Description

The TDA7541B is a high performance tuner circuit with stereo decoder for AM/FM car radio. It contains a mixer, IF amplifier, demodulator for AM and FM, stereo decoder, quality detection, ISS filter and PLL synthesizer with IF counter on a single chip. Use of BICMOS technology allows the implementation of several tuning functions and a minimum of external components.

C bus controlled

Order code Package Packing

TDA7541B LQFP64 (10 x 10 x 1.4 mm) Tray

TDA7541BTR LQFP64 (10 x 10 x 1.4 mm) Tape and reel

TDA7541BW LQFP64 (14 x 14 x 1.4 mm) Tray

TDA7541BWTR LQFP64 (14 x 14 x 1.4 mm) Tape and reel

July 2009 Doc ID 16048 Rev 1 1/77

www.st.com

Contents TDA7541B

Contents

1 Block circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Pin connection and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Electrical specifications and characteristics . . . . . . . . . . . . . . . . . . . . 10

3.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3.1 Globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3.2 FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3.3 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.3.4 Stereo decoder section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.3.5 PLL section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.1 FM part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.1.1 Mixer 1 AGC and IF amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.1.2 Mixer2, limiter, FM demodulator and spike cancellation . . . . . . . . . . . . 26

4.1.3 Quality detection and ISS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.1.4 Block diagram quality detection principle . . . . . . . . . . . . . . . . . . . . . . . . 29

4.1.5 Strong adjacent channel correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4.1.6 Weak signal mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4.1.7 Weather band input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.2 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.2.1 Usage of control bit ADSEL (Addr23D7) . . . . . . . . . . . . . . . . . . . . . . . . 32

4.3 Stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.3.1 Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.3.2 Noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

4.3.3 Functional description of the multipath detector . . . . . . . . . . . . . . . . . . 37

4.3.4 Quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

4.3.5 AFS control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 37

4.4 PLL and IF counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

2/77 Doc ID 16048 Rev 1

TDA7541B Contents

4.4.1 PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

4.4.2 IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

4.5 I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5 Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.1 Chip address and overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.2 Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.3 Control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

5.4 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

7 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Doc ID 16048 Rev 1 3/77

List of tables TDA7541B

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 5. Globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 6. FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 7. AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 8. Stereo decoder section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 9. PLL section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 10. ISS filter control by I

Table 11. Internal ISS control signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 12. ISS control modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table 13. Usage of ADSEL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Table 14. Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Table 15. I

Table 16. Subaddress description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 17. Addr 0 TPLL charge pump control (0Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 18. Addr 1 TPLL Counter 1 (LSB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 19. Addr 2 TPLL Counter 2 (MSB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 20. Addr 3 TV(00h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 21. Addr 4 TV/IF Counter (FM ACh, AM 1Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Table 22. Addr 5 TPLL Divider (FM 3Dh, AM 2Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Table 23. Addr 6 AGC (FM 06h, AM 2Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Table 24. Addr 7 Quality AC (FM 50h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Table 25. Addr 8 Quality ACM/MP (FM 6Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Table 26. Addr 9 Quality Dev (FM 49h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Table 27. Addr 10 Quality MUX/FSU (FM 0Eh, AM 0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 28. Addr 11 Weak Signal Mute (FM A8h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 29. Addr 12 AM IF NB (AM B1h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Table 30. Addr 13 XTAL adjust(80h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Table 31. Addr 14 IF2 adjust (FM E8h, AM 08h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Table 32. Addr 15 IQ adjust / Switch (FM E7h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Table 33. Addr 16 FM keying AGC (FM 1Dh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Table 34. Addr 17 Roll off / Level gain (77h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Table 35. Addr 18 SD Stereoblend / AM corner frequency (0Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Table 36. Addr 19 SD High cut (2Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Table 37. Addr 20 SD MP (FM 97h, AM 3Fh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Table 38. Addr 21 SD Quality (FFM 7Ah, AM FAh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Table 39. Addr 22 SD NB I (FM 05h, AM 04h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Table 40. Addr 23 SD NB II (FM E2h, AM C2h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Table 41. Addr 24, 26, 27, 28, 29 testing (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Table 42. Addr 25 Testing (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Table 43. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

C control bit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

C bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4/77 Doc ID 16048 Rev 1

TDA7541B List of figures

List of figures

Figure 1. Block circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 3. Programming of HC filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 4. Programming of stereo blend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 5. Adaptive threshold control of noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 6. Stereo blend controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 7. Deviation controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 8. Block diagram FM part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 9. Block diagram VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Figure 10. Block diagram ISS function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Figure 11. Block diagram AM path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Figure 12. Block diagram stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Figure 13. Block diagram audio noise blanker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Figure 14. Block diagram multi path detection for stereo decoder. . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Figure 15. Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Figure 16. LQFP64 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Doc ID 16048 Rev 1 5/77

Block circuit diagram TDA7541B

1 Block circuit diagram

Figure 1. Block circuit diagram

6/77 Doc ID 16048 Rev 1

TDA7541B Pin connection and pin description

2 Pin connection and pin description

2.1 Pin connection

Figure 2. Pin connection (top view)

VCCMIX1

DEVTC

AMMIX1IN

AMRFAGCOUT

AMMIX1RAF

AMPINDR

FMMIX1IN1

GNDRF

FMMIX1IN2

FMPINDR

FMAGCTC

VCOB

VCOE

VCCVCO

MIX1OUT

GNDIF

MIX1REF

VCCIF1

IF1AMPIN

IF1REF

IF1AMPOUT

AMAGC2TC

AMRFAGCTC

MIX2IN56MIX2INREF

GNDVCC2

VCC2

MIX2REF

MIX2OUT53MIX2AMPOUT

51 50

VREF1

AMIF2IN

GNDDEM

FMREFDEMC

AMIF2REF

MPXOUT

MUTETC

MPXIN

AMREFDEMC

MPTC

GNDSTD

FSWO

VCC1

GNDVCC1

LPF

VREF2

LPOUT

GNDVCO

LPHC

MUX

SDA

SSTOP

SCL

FSU

FSTC

XTALG

ISSTC1

XTALD

ISSTC2

Doc ID 16048 Rev 1 7/77

Pin connection and pin description TDA7541B

2.2 Pin description

Table 2. Pin description

Pin No. Pin name Function

1 VCCMIX1 Mixer1 Supply

2 DEVTC Deviation Detector Time Constant

3 AMMIX1IN AM Mixer1 Input

4 AMRFAGCOUT AM RF AGC Voltage Output

5 WB Weather Band Input

6 AMMIX1REF AM Mixer1 Reference

7 AMPINDR AM Pin Diode Driver Output

8 FMMIX1IN1 FM Mixer1 Input1

9 GNDRF RF Ground

10 FMMIX1IN2 FM Mixer1 Input2

11 TV Tuning Voltage Preselection

12 FMPINDR FM Pin Diode Driver Output

13 FMAGCTC FM AGC Time Constant

14 VCOB VCO Input Base

15 VCOE VCO Output Emitter

16 VCCVCO VCO Supply

17 GNDVCO VCO Ground

18 LPOUT OpAmp Output to PLL Loop Filter

19 VREF2 Voltage Reference for PLL OpAmp

20 LPF OpAmp Input to PLL Loop Filter

21 LPHC High Current PLL Loop Filter Input

22 SW Free Programmable Switch Output

23 MUX Multiplexer Output

24 SSTOP Search Stop Output

25 SDA I

26 SCL I

C Bus Data

C Bus Clock

27 FSU Unweighted Field Strength Output

28 FSTC S-meter Filtering Capacitor

29 XTALG Xtal Oscillator to MOS Gate

30 ISSTC1 ISS Filter Time Constant1 (slow)

31 ISSTC2 ISS Filter Time Constant2 (fast)

32 XTALD Xtal Oscillator to MOS Drain

33 GNDVCC1 Digital Ground

8/77 Doc ID 16048 Rev 1

TDA7541B Pin connection and pin description

Table 2. Pin description (continued)

Pin No. Pin name Function

34 L Stereo Decoder Output Left

35 R Stereo Decoder Output Right

36 VCC1 Digital Supply

37 FSWO Weighted Field Strength Output

38 GNDSTD Stereo Decoder Ground

39 MPTC Multipath Detector Time Constant

40 AMREFDEMC AM Demodulator Reference

41 MPXIN Stereo Decoder Input

42 MUTETC Weak Signal Mute Time Constant

43 MPXOUT AM Audio / MPX Output

44 AMIF2REF AM IF2 Amplifier Reference Voltage

45 FMREFDEMC FM Demodulator Reference

46 GNDDEM FM Demodulator Ground

47 AMIF2IN AM IF2 Amplifier Input

48 VREF1 5V Reference

49 GNDVCC2 Analog Ground

50 MIX2AMPOUT MIXER2 Amplifier Output

51 VCC2 Analog Supply

52 MIX2REF Mixer2 Reference

53 MIX2OUT Mixer2 Output

54 AMRFAGCTC AM RF AGC Time Constant

55 MIX2INREF Mixer2 Input Reference

56 MIX2IN Mixer2 Input

57 AMAGC2TC AM AGC2 Time Constant

58 IF1REF IF1 Amplifier Reference

59 IF1AMPOUT IF1 Amplifier Output

60 VCCIF1 IF1 Supply

61 IF1AMPIN IF1 Amplifier Input

62 GNDIF1 IF1 Ground

63 MIX1REF Mixer1 Reference

64 MIX1OUT Mixer1 Output

Doc ID 16048 Rev 1 9/77

Electrical specifications and characteristics TDA7541B

3 Electrical specifications and characteristics

3.1 Thermal data

Table 3. Thermal data

Symbol Parameter Value Unit

TH(j-amb)

Thermal resistance junction-to-ambient Max. 70 °C/W

3.2 Absolute maximum ratings

Table 4. Absolute maximum ratings

Symbol Parameter Conditions Value Unit

Supply voltage - 9.5 V

Ambient temperature - -40 to 85 °C

Storage temperature - -55 to +150 °C

ESD withstand voltage

amb

ESD

stg

3.3 Electrical characteristics

3.3.1 Globals

= 25 °C, V

amb

in application circuit, unless otherwise specified.

Table 5. Globals

CC1

= V

CC2

= V

CCMIX1

= V

Human Body Model 2 kV

Machine Model 100 V

Charged Device Model 300 V

CCVCO

= V

CCIF

= 8.5 V, f

= 10.25 MHz,

Xtal

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

1. Supply

1.1 V

1.2 V

1.3 V

1.4 V

1.5 V

1.6 I

1.7 I

1.8 I

1.9 I

CC1

CC2

CCVCO

CCMIX1

CCIF

CC1

CC2

Digital supply voltage - 7.7 8.5 9 V

Analog supply voltage - 7.7 8.5 9 V

VCO supply voltage - 7.7 8.5 9 V

Mixer1 supply voltage - 7.7 8.5 9 V

IF1 Supply Voltage - 7.7 8.5 9 V

Supply current FM ON - 19 23 mA

Supply current AM ON - 21 25 mA

Supply current FM ON - 48 58 mA

Supply current AM ON - 37 44 mA

10/77 Doc ID 16048 Rev 1

TDA7541B Electrical specifications and characteristics

Table 5. Globals (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

1.10 I

1.11 I

1.12 I

1.13 I

CCVCO

CCMIX1

CCIF

Supply current - - 12 15 mA

Supply current FM ON - 32 40 mA

Supply current AM ON - 20 24 mA

Supply current - - 4 5 mA

2. Reference voltages

2.1 V

2.2 V

3. I

C bus interface

3.1 f

3.2 V

3.3 V

3.4 I

3.5 V

REF1

REF2

SCL

Internal reference voltage I

Clock frequency - - - 400 kHz

Input low voltage - - - 1 V

Input high voltage - 2 - - V

Input current - -5 - 5 µA

Output acknowledge voltage IO = 1.6mA - - 0.4 V

3.3.2 FM section

= 25 °C, V

amb

= 98 MHz, dev = 40 kHz, f

Table 6. FM section

CC1

= V

CC2

= 0mA 4.855.2V

REF1

= 0mA 2.4 2.5 2.6 V

REF2

= V

CCMIX1

Mod

= V

CCVCO

= V

CCIF

= 8.5 V, f

= 10.25 MHz,

Xtal

= 1 kHz, in application circuit, unless otherwise specified.

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

4. Wide band RF AGC

4.1 V

4.2 V

4.3 Δ V

8-10

Lower threshold start V13 = 2.5 V, RFK “0” - 79 - dBμV

Upper threshold start V13 = 2.5 V, RFK”0” - 93 - dBμV

Control range RF KAGC

8-10

KAGC”000”, RFAGC”00”, V

= 3.0….3.7 V, RFK”1”

5811-

5. Narrow band IF and keying AGC

5.1 V

5.2 V

5.3 V

5.4 V

5.5 Δ V

Lower threshold start KAGC = off, V

Upper threshold start KAGC = off, V

Max. IFAGC threshold

with KAGC

Start point KAGC KAGC”000”,IFAGC”00”, 3.2 3.4 3.6 V

Control range IF KAGC

KAGC”000”,IFAGC”00”, V37 = 3.0 V

KAGC”000”,IFAGC”00”,

= 3.2….3.9 V

8-10

= 0 mV

RMS

- 82 - dBµV

- 94 - dBµV

- 97 - dBµV

12 15 18 dB

6. AGC time constant output

6.1 V

Max. AGC output voltage V

8-10

= 0 mV

RMS

REF1

Doc ID 16048 Rev 1 11/77

Electrical specifications and characteristics TDA7541B

Table 6. FM section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

6.2 V

6.3 I

6.4 I

Min. AGC output voltage V

Min. AGC charge current V

Max. AGC discharge

current

8-10

= 100 mV

= 0 mV

RMS,V13

= 100 mV

RMS

--0.5V

= 2.5 V -33 -25 -17.5 µA

RMS,V13

= 2.5 V 1.7 2.5 3.3 mA

7. AGC PIN diode driver output

7.1 I

7.2 I

AGC OUT, current min. V

AGC OUT, current max. V

8-10

= 0 mV

= 50 mV

, V12 = 2.5V 15 25 35 µA

RMS

, V12 = 2.5 V - - -16 mA

RMS

8. FM I/Q Mixer1 (10.7 MHz)

8.1 R

8.2 C

8.3 R

8.4 V

OUT

8,11

Input resistance Differential 8 10 12 kΩ

Input capacitance Differential - 4 - pF

Output resistance - 530 660 790 Ω

Input DC bias - 2.2 2.5 2.8 V

8.5 G Gain Unloaded 20 22 24 dB

8.6 G

Gain With 330 Ω load 14 16 18 dB

8.7 INOISE Equivalent input noise - - 3 - nV/

8.8 CP

8.9 IIP3 3

1dB compression point Referred to diff. mixer input - 100 - dBµV

1dB

order intermodulation - - 119 - dBµV

√Hz

8.10 IQP I/Q phase adjust PH -7 - +8 DEG

8.11 IRR Image rejection ratio Ratio wanted/image 30 40 - dB

8.12 IRR Image rejection ratio With phase adjust 40 46 - dB

9. WB I/Q Mixer1 (10.7 MHz)

9.1 R

9.2 C

9.3 R

9.4 V

OUT

Input resistance Single ended 1.7 2.5 3.3 kΩ

Input capacitance Single ended - 3 - kΩ

Output resistance - 530 660 790 Ω

Input dc bias - 2 2.3 2.6 V

9.5 G Gain unloaded 24 26 28 dB

9.6 INOISE Equivalent Input noise Source impedance 400 Ω -2.3 -nV/

9.7 IIP3 3

order intermodulation - - 113 - dBµV

√Hz

10. IF1 amplifier (10.7 MHz)

10.1 R

10.2 C

10.3 V

10.4 R

10.5 C

OUT

Input resistance - 265 330 396 Ω

Input capacitance - - 2.5 - pF

DC input voltage - - V

/3 - V

CCIF1

Output resistance - 265 330 396 Ω

Output capacitance - - 2.5 - pF

12/77 Doc ID 16048 Rev 1

TDA7541B Electrical specifications and characteristics

Table 6. FM section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

10.6 V

10.7 G

10.8 G

10.9 INOISE

10.10 CP

10.11 IIP3 3

DC output voltage - - V

Min. gain IFG - 9 - dB

min

Max. gain IFG - 21 - dB

max

, R

Equivalent input noise voltage

1 dB compression point referred to 330 Ω input, G

1dB

order Intermodulation referred to 330 Ω input, G

max

noise of R

=330 Ω, RL=330 Ω,

gen

not included

gen

max

CCIF1

- 3.2 - nV/√Hz

-99 -dBµV

- 130 - dBµV

/2 - V

11. Mixer2 (450kHz)

11.1 R

11.2 C

11.3 V

11.4 R

11.5 C

11.6 V

11.7 g

55.56

OUT

52,53

Input resistance Differential 240 300 360 Ω

Input capacitance - - 2.5 - pF

DC input voltage - 3.7 4

Output resistance - 100 - - kΩ

Output capacitance - - 2.5 - pF

DC output voltage - 3.7 4 4.3 V

Conversion

transconductance

WB Mode; referred to MIX2OUT - 126 - µA/V

4.3 V

11.8 G Gain FM Mode, referred to MIX2OUT - 16 - dB

11.9 C

11.10 C

step

max

11.11 INOISE

11.12 CP

11.13 IIP3 3

Min. cap. Step IF2A - 2.2 - pF

Max. cap. IF2A - 33 - pF

Equivalent input noise voltage,

including buffer mixer2

1dB compression point referred to 330 Ω input,IF2Q”10” - 116 - dBμV

1dB

order Intermodulation referred to 330 Ω input,IF2Q”10” - 132 - dBμV

= 330 Ω, IF2Q”10”

gen

noise of R

gen

not included

-15 -nV/√Hz

12. Demodulator, audio output

12.1 THD Total harmonic distortion

12.2 a

12.3 V

12.4 R

12.5 R

MPX

OUT

LOAD

AM suppression

MPX output signal Dev.= 75 kHz 440 500 560 mV

Output impedance - 20 40 60 Ω

Load resistance - 10 - - kΩ

Dev.= 75 kHz, V IF2Q”11”

=100 dBµ, Δf = 40 KHz,

=1 kHz,

mod

=1 kHz@AM, m =0.3 %

mod

= 100 dBµV,

- 0.1 0.3 %

40 60 - dB

RMS

Doc ID 16048 Rev 1 13/77

Electrical specifications and characteristics TDA7541B

Table 6. FM section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

12.6 (S+N)/N

Signal plus noise-to-noise ratio at MPXOUT

Signal plus noise-to-noise

12.7 (S+N)/N

ratio In weatherband mode

13. Quality detection

Unweighted field strength (FSU) and weighted field strength

13.1 V

13.2 V

13.3 V

13.4 V

13.5 ΔV

13.6 ΔV

13.7 R

13.8 V

OUT

DC output voltage

Slope - - 25 - mV/dB

DC offset - -200 - 0 mV

Output impedance FSWO 17 23.5 30 kΩ

DC output voltage

Δf = 40 kHz, f

=100 dBµV,

mod

=1 kHz,

De-emphasis = 50 µs, B = 200 Hz to 15 kHz ISSENA = 0

Δf = 3.5 kHz, f

=100 dBµV,

mod

=1 kHz,

De-emphasis = 75 µs, setting see Ta bl e 1 0

= 20 dBμV, FMON=1,

FSWO = OFF

= 50 dBμV, FMON=1,

FSWO = OFF

= 70 dBμV, FMON=1,

FSWO = OFF

> 120 dBμV, FMON=1,

FSWO = OFF

= 20 dBμV, FMON=1,

SL=”101”

70 - - dB

40 - - dB

-2.5 - V

-3 -V

-3.5 - V

-4.6 - V

-0.10.4V

= 50 dBμV, FMON=1,

13.9 V

13.10 V

13.11 V

13.12 ΔV

13.13 R

13.14 R

13.15 V

13.16 V

13.17 V

13.18 V

OUT

load

DC output voltage

Slope - - 50 - mV/dB

Output impedance FSU 320 400 480 Ω

Load resistor FSU - 20 - kΩ

DC output voltage AM

SL=”101”

= 70 dBμV, FMON=1,

SL=”101”

> 120 dBμV, FMON=1,

SL=”101”

= 20 dBμV, FMON = 0,

SL= ”010”

= 40 dBμV, FMON = 0,

SL= ”010”

= 60 dBμV, FMON = 0,

SL= ”010”

> 100 dBμV, FMON = 0,

SL= ”010”

14/77 Doc ID 16048 Rev 1

-1 -V

-2 -V

4- -V

-0.10.3V

-1.25 - V

-3.0 - V

4.5 - - V

TDA7541B Electrical specifications and characteristics

Table 6. FM section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

13.19 ΔV

13.20 f

Slope AM FMON=0 - 90 - mV/dB

-3 dB frequency low pass

FMON=0 - 40 - kHz

Adjacent channel gain

13.21 G

Gain - - 32 - dB

Adjacent channel filter

13.22 f

13.23 f

13.24 f

-20dB

-3 dB frequency highpass ACF=0 - 100 - kHz

Attenuation 20dB - - 70 - kHz

Centre frequency ACF=1 - 100 - kHz

Multipath channel gain

13.25 G

Gain - - 12 - dB

Multipath bandpass filter

13.26 f

Centre frequency - - 19 - kHz

13.27 Q Quality factor - 5 8 10 -

14. ISS (intelligent selectivity system) filter 450kHz

14.1 f

centre

Centre frequency f

REF_intern

= 450kHz 450 kHz

14.2 BW 3dB Bandwidth, -3 dB ISSBW = 1 70 80 90 kHz

14.3 BW 20dB Bandwidth, -20 dB ISSBW = 1 132 150 168 kHz

14.4 BW 3dB Bandwidth, -3 dB ISSBW = 0 106 120 135 kHz

14.5 BW 20dB Bandwidth, -20 dB ISSBW = 0 220 250 280 kHz

14.6 BW 3dB Bandwidth weather band WBON = 1 18 22 26 kHz

14.7 BW 20dB -20dB weather band WBON = 1 - 70 - kHz

Adjacent channel ISS filter threshold

14.8 V

14.9 V

THAC

Internal low threshold ACTH - 2.75 - V

Internal high threshold ACTH - 3.05 - V

Multipath threshold

14.10 V

14.11 V

THMP

Internal low threshold MPTH - 0.50 - V

Internal high threshold MPTH - 1.25 - V

ISS filter time constant

14.12 I

14.13 I

14.14 I

14.15 I

14.16 I

30,31

Charge current low mid TISS, BWDEF = 1 -89 -74 -59 µA

Charge current high mid TISS, BWDEF = 1 -72 -60 -48 µA

Charge current low narrow TISS, BWDEF = 1 -148 -124 -99 µA

Charge current high narrow

TISS, BWDEF = 1 -132 -110 -88 µA

Discharge current low TISS, BWDEF = 0 0.5 1 1.5 µA

Doc ID 16048 Rev 1 15/77

Electrical specifications and characteristics TDA7541B

Table 6. FM section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

14.17 I

14.18 V

14.19 V

30,31

Discharge current high TISS, BWDEF = 0 11 15 19 µA

Low voltage BWDEF = 0 - 0.1 0.2 V

High voltage BWDEF = 1 4.6 4.9 - V

ISS filter switch threshold

14.20 V

14.21 V

14.22 V

14.23 V

30,31

Threshold ISS on BWDEF = 0 - 3 - V

Threshold ISS off BWDEF = 0 - 1 - V

Threshold ISS narrow on BWDEF = 0 - 4 - V

Threshold ISS narrow off BWDEF = 0 - 2 - V

Deviation detection

14.24 I

14.25 I

14.26 I

14.27 I

14.28 DEV

14.29 DEV

14.30 RATIO

14.31 RATIO

Charge current low TDEV -40 -32 -20 µA

Charge current high TDEV -48 -39 -30 µA

Discharge current low TDEV 0.5 1 1.5 µA

Discharge current high TDEV 5.5 8 10.5 µA

Internal low threshold DWTH, I3 = 1 µA - 20 - kHz

WTH

Internal high threshold DWTH, I3 = 1 µA - 50 - kHz

WTH

Referred to threshold DTH - 1 -

min

Referred to threshold DTH - 1.5 -

max

15. Weak signal mute

15.1 V

15.2 V

15.3 a

15.4 a

15.5 a

15.6 V

MTHISS

ACMTH

15.7 a

15.8 I

15.9 I

WMD

ACMD

Upper start point

Lower start point

Min. mute depth WMD = 0, WMTH = 7, V

Max. mute depth WMD = 7, WMTH = 7, V56=OFF 22 26 - dB

Mute threshold below WMTH for ISS filter “ON”

Internal AC mute threshold

AC mute depth ACMD 3 - 8 dB

Charge current - -65 -47.5 -30 μA

Discharge current - 1.5 2.5 4 μA

16. Multiplexer output

16.1 V

16.2 V

16.3 R

16.4 R

OUT

23load

Output voltage low - - 0.1 0.2 V

Output voltage high - 4.6 4.9 - V

Output resistance - 200 250 300 Ω

Load resistor - 20 - - kΩ

WMTH = 0, WMD = 7, V AF = -3 dB

WMTH = 7, WMD = 7, V AF = -3 dB

WMD, WMTH, V

IN=V56

=OFF 10 14 - dB

-2.9 - V

-2.7 - V

-1 -dB

ACMTH 40 - 260 mV

16/77 Doc ID 16048 Rev 1

TDA7541B Electrical specifications and characteristics

3.3.3 AM section

= 25 °C, V

amb

= 1 MHz, m = 30%, f

Table 7. AM section

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

17. Global

17.1 V

ANT_US

Usable sensitivity

17.2 (S+N)/N Signal to Noise Ratio Ref.: V

17.3 a

17.4 V

17.5 V

17.6 V

17.7 V

17.8 V

17.9 V

IF1 rejection S/N = 26 dB, m = 30 %, f

Min. RF AGC threshold

Max. RF AGC threshold - 104 - dBµV

Min. IF AGC threshold

Max. IF AGC threshold - 102 - dBµV

Min. DAGC threshold

Max. DAGC threshold - 98 - dBµV

18. AGC voltage driver output

CC1

= V

(1)

= V

CC2

mod

CCMIX1

= 1 kHz, in application circuit, unless otherwise specified.

= V

CCVCO

= V

CCIF

= 8.5 V, f

= 10.25 MHz,

Xtal

(S+N)/N = 26 dB - 19 25 dBµV

= 80 dBµV 50 55 - dB

= 1 kHz 70 80 - dB

mod

- 92 - dBµV

RFAGC

- 78 - dBµV

IFAGC

- 86 - dBµV

DAGC

18.1 V

18.2 V

18.3 | I

Max. AGC output voltage - 3.3 3.5 - V

Min. AGC output voltage - - - 0.5 V

AGC current V4 = 0 V, V54 = 3.5 V, LNA”00” - 340 - µA

4 |

19. AGC PIN diode driver output

19.1 I

AGC driver current - - - -15 mA

20. AM Mixer1 (10.7 MHz)

20.1 R

20.2 C

20.3 R

OUT

20.4 CP

20.5 V

20.6 IIP3 3

20.7 INOISE Equivalent input noise - - 5.5 -

Input resistance differential 45 - - kΩ

Input capacitance differential - 2.5 - pF

Output impedance - 530 660 790 Ω

1dB compression point referred to diff. mixer input - 112 - dBμV

1dB

Input DC bias - 0.3 0.4 0.55 V

3,6

order intermodulation - - 132 - dBμV

nV/√Hz

20.8 G Gain With 330 Ω filter 35.57 dB

21. AM mixer2

21.1 R

21.2 C

21.3 V

21.4 R

55.56

OUT

Input resistance - 240 300 360 Ω

Input capacitance - - 2.5 - pF

DC input voltage - 3.8 4 4.2 V

Output resistance - 100 - - kΩ

Doc ID 16048 Rev 1 17/77

Electrical specifications and characteristics TDA7541B

Table 7. AM section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

21.5 C

21.6 V

21.7 g

21.8 G

OUT

52,53

max

Output capacitance - - 2.5 - pF

DC output voltage - 3.7 4.0 4.3 V

Conversion

transconductance

Max. gain

MIX2OUT - 440 - µA/V

L = 560 µH, Q = 28; C = 180 pF, referred to MIX2OUT

-26- dB

21.9 ΔG Gain control range - - 20 - dB

21.10 C

21.11 C

step

max

21.12 INOISE

21.13 CP

21.14 IIP3 3

Min. cap. Step IF2A - 2.2 - pF

Max. cap. IF2A - 33 - pF

Equivalent input noise voltage,

including buffer mixer2

1dB compression point A

1dB

order Intermodulation A

, R

max

of R

max

= 330 Ω, RL = 2 kΩ, noise

gen

not included

gen

-11-

, referred to 330 Ω input -114-dBμV

, referred to 330 Ω input -132-dBμV

nV/√H

22. Buffer AM mixer2

22.1 R

22.2 C

OUT

22.3 V

22.4 G gain R

Output resistance - 1.6 2 2.4 kΩ

Output capacitance - - 2.5 - pF

DC output voltage - 3.7 4.0 4.3 V

= 2 kΩ -8 -6 -4 dB

23. AM IF2 amplifier

23.1 R

23.2 C

23.3 V

23.4 G

23.5

44,47

max

ΔG Gain control range - 36 38 40 dB

23.6 INOISE

23.7 CP

1dB

23.8 IIP3 3

23.9 V

24. AMAGC2

24.1 V

24.2

24.3 g

AGC(start)

ΔAGC AGC2 range

AGC

Input resistance - 1.6 2 2.4 kΩ

Input capacitance - - 2.5 - pF

DC input voltage - 4.1 4.3 4.5 V

Max. gain - 495255 dB

, R

Equivalent input noise voltage

1 dB compression point G

order Intermodulation G

max

noise of R

max

IF2 output voltage V56 = 90 dBV, m = off 140 190 240

= 2 kΩ,

gen

not included

-9.5-

nV/√Hz

, referred to 2 kΩ input -74-dBμV

, referred to 2 kΩ input -100-dBμV

RMS

AGC start voltage (PIN47) Input carrier voltage - 62 - dBµV

Between start of AGC2 and the intervention point

50 55 - dB

of prestage AGC

Control slope Seek mode - 50 - µA/V

18/77 Doc ID 16048 Rev 1

TDA7541B Electrical specifications and characteristics

Table 7. AM section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

24.4 g

24.5 II

24.6 II

24.7 V

24.8 V

AGC

Control slope normal mode - 5 - µA/V

I Max. AGC charge current Seek mode - 125 - μA

I Max. AGC charge current normal mode - 5 - μA

Max. AGC output voltage V47 = 100 dBµ 4.6 4.8 - V

Min. AGC output voltage V47 = 20 dBµ - 0.2 0.5 V

25. AM audio output

25.1 V

Audio output voltage

25.2

THD Total harmonic distortion

25.3

25.4 R

OUT

Output impedance - 20 25 30 Ω

26. IF noise blanking

26.1 t

26.2 t

26.3 V

26.4 V

26.5 V

1. Can be reached in application circuit, not measured.

thstep

Min. blanking time - - 8 - μs

Max. blanking time - - 17 - μs

Min internal threshold - - 50 - mV

Max. internal threshold - -

Threshold step - - 12.5 - mV

= 90 dBµ, m = 30 %,

= 1KHz

mod

= 90 dBµ, m = 30 %,

= 1 kHz

mod

= 90 dBµ, m = 80%,

= 1 kHz

mod

170 200 230

-0.30.5

-0.50.9

187.5

-mV

3.3.4 Stereo decoder section

= 25 °C, V

amb

= 500 mV

MPX

otherwise specified.

Table 8. Stereo decoder section

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

27. Stereo decoder

27.1

27.2 WBON = 1 - 0.05 0.06

27.3 R

27.4 G

27.5 G

27.6 SVRR

STD

STDWB

MPX input level

Input resistance - 80 100 120 kΩ

Stereo decoder gain - 2 2.5 3 dB

Stereo decoder gain Weather band mode 23 26 27 dB

Supply voltage ripple rejection

= V

CC1

mono, f = 1 kHz, de-emphasis τ = 50 µs, in application circuit, unless

rms

CC2

= V

CCMIX1

= V

CCVCO

= V

CCIF

= 8.5 V, f

= 10.25 MHz,

Xtal

--0.50.93

= 100 mV, f = 1 kHz - 60 - dB

ripple

Doc ID 16048 Rev 1 19/77

rms

Electrical specifications and characteristics TDA7541B

Table 8. Stereo decoder section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

27.7 A channel separation

= 500 mV

MPX

L/R, ROC adjusted

stereo, only

rms

35 40 - dB

27.8 THD Total harmonic distortion - - 0.02 0.3 %

27.9 (S+N)/N

Signal plus noise to noise ratio

A-weighted, 19 kHz notch - 85 - dB

28. Mono/stereo switch

28.1 V

28.2 V

28.3 V

28.4 V

PTHST1

PTHST0

PTHMO1

PTHMO0

Pilot threshold voltage for Stereo, PTH = 1 5 8 12 mV

Pilot threshold voltage for Stereo, PTH = 0 7 11 16 mV

Pilot threshold voltage for Mono, PTH = 1 3.5 6 10 mV

Pilot threshold voltage for Mono, PTH = 0 6 9 14 mV

29. 19kHz PLL

29.1 f

lock

29.2 DP Pilot deviation range f

Capture range Pilot magnitude 20 mV

= 19 kHz 4 - 30 %

pilot

= 4 % 18.9 - 19.1 kHz

rms

30. De-emphasis and high cut

30.1 t

30.2 t

HC50

HC75

De-emphasis time constant

DEEMP=0, High Cut OFF 45 50 55 μs

DEEMP = 1, High Cut OFF 67 75 83 μs

rms

30.3 t

30.4 t

30.5 A

30.6 A

HC50

HC75

Ammin

Ammax

High cut time constant

Min. Attenuation in AM

Max. Attenuation in AM

31. Stereo blend and high cut control

31.1 LG

31.2 LG

31.3 LG

31.4 VSBL

31.5 VSBL

31.6 VSBL

31.7 VHCH

31.8 VHCH

Min. level gain LG -0.3 0 0.3 dB

min

Max. level gain LG 7.75 8.25 8.75 dB

max

Level gain step Resolution - 0.25 0.55 0.85 dB

step

Min. voltage for mono SBC 24 29 34 %V

min

Max. voltage for mono SBC 53 58 63 %V

max

Step resolution SBC 3.5 4.2 5 %V

step

Min. voltage for no high

min

cut

Max.voltage for no high

max

cut

DEEMP = 0, High Cut ON, V

=0.1V

DEEMP= 1, High Cut ON,

= 0.1 V

Voutmax/Vout@ f = 3.5 kHz, DEEMP = 0, AMCF “111”

Voutmax/Vout@ f = 3.5 kHz, DEEMP= 0, AMCF “000”

HCHT 374247%V

HCHT 616671%V

135 150 165 μs

200 225 250 μs

-3.6- dB

-8-dB

REF1

20/77 Doc ID 16048 Rev 1

TDA7541B Electrical specifications and characteristics

Table 8. Stereo decoder section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

31.9 VHCH

31.10 VHCL

31.11 VHCL

31.12 VHCL

Step resolution HCHT 7 8 9 %V

step

Min. voltage for full high cut

min

Max. voltage for full high cut

max

Step resolution HCLT 6.5 7.3 8.1 %VHCH

step

HCLT 6 11 16 %VHCH

HCLT 28 33 38 %VHCH

32. Carrier and harmonic suppression at the output

32.1 a19 Pilot signal f = 19 kHz - 45 50 - dB

32.2 a38 Subcarrier f = 38 kHz - - 75 - dB

32.3 a57 Subcarrier f = 57 kHz - - 62 - dB

32.4 a76 Subcarrier f = 76 kHz - - 90 - dB

mod

(2)

(1)

= 10 kHz, f

= 13 kHz, f

=1 kHz - - 65 - dB

spur

=1 kHz - - 75 - dB

spur

33. Intermodulation

33.1 a2 f

33.2 a3 f

34. Traffic radio

34.1 a57 Signal f = 57 kHz - 65 70 - dB

35. SCA

(3)

35.1 a67 Signal f = 67 kHz - - 75 - dB

36. ACI – adjacent channel interference

(4)

REF1

36.1 a114 Signal f = 114 kHz - - 95 - dB

36.2 a190 Signal f = 190 kHz - - 84 - dB

37. FM noise blanker

37.1 V

37.2 V

37.3 V

37.4 V

37.5 V

37.6 V

37.7 V

37.8 V

37.9 V

TRMIN

TRMAX

TRNOISE

PEAK

PEAKDEV

Min. trigger threshold

Max. trigger threshold

Min. noise controlled trigger threshold

Max. noise controlled trigger threshold

Peak voltage NBRR “00”, V

Peak voltage

Min. deviation dependent peak voltage

Max. deviation dependent peak voltage

(5)

PEAK

(5)

PEAK

NBRR “00”, V f = 150 kHz

MPX

NBDC = 11 (“OFF”)

MPX

=0.8 V, NBLT “111” - 147 - mV

=0.8 V, NBLT “000” - 280 - mV

= 1.5 V, NBCT “11” - 450 - mV

= 1.5 V, NBCT “00” - 1200 - mV

= 0 mV - 0.8 - V

MPX

= 50 mV,

MPX

= 500 mV,

= 200 mV,

-1.9- V

-3.5- V

-0.8- V

= 500 mV, NBDC= 00 - 2.0 - V

Doc ID 16048 Rev 1 21/77

Electrical specifications and characteristics TDA7541B

Table 8. Stereo decoder section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

37.10 V

37.11 V

PEAKFS

37.12 T

37.13 T

37.14 SR

37.15 SR

37.16 V

37.17 V

37.18 V

37.19 V

37.20 V

37.21 V

37.22 V

RECTADJ

ADJMP

Min. fieldstrength controlled peak voltage

Max. fieldstrength controlled peak voltage

Min. blanking time

Max. blanking time

Noise rectifier charge

PEAK

Noise rectifier charge

PEAK

Noise rectifier discharge adjustment

Noise rectifier adjustment by multipath

Noise rectifier adjustment by strong multipath influence

Noise rectifier adjustment by multipath and strong multipath influence

MPX

=0mV, V

LEVEL

<< V

SBL

(fully mono), NBFC = 11 (“OFF”)

MPX

=0mV, V

LEVEL

<< V

SBL

(fully mono), NBFC = 00

Signal HOLDN in testmode, NBT = 00

Signal HOLDN in testmode, NBT = 11

Signal PEAK in testmode, NBPC =0

Signal PEAK in testmode, NBPC=1

Signal PEAK in testmode, NBRR=00

Signal PEAK in testmode, NBRR=01

Signal PEAK in testmode, NBRR=10

Signal PEAK in testmode, NBRR=11

Signal PEAK in testmode,

=1V, NBSMP=0, NBMP=1,

MPTC

NBRR=01

Signal PEAK in testmode, V

= 1V, NBSMP = 1,

MPTC

NBMP = 0, NBRR = 01

Signal PEAK in testmode,

=1 V, MBSMP=1,

MPTC

NBMP=1, NBRR=01

-0.8- V

-2.0- V

-38- μs

-22- μs

-5-mV/μs

-12-mV/μs

- 0.3 - V/ms

- 1.8 - V/ms

- 2.8 - V/ms

-4-V/ms

-3-V/ms

-4-V/ms

- 5.2 - V/ms

38. Multipath detector

38.1 G

38.2 G

38.3 G

38.4 G

RECTMP

38.5 I

38.6 I

38.7 I

DISMP

CHMP

Min. multipath gain MPG = 00 5 6 7 dB

Max. multipath gain MPG = 11 11 12 13 dB

Min. rectifier gain MPRG = 01 -1 0 1 dB

Max. rectifier gain MPRG = 11 5 7.6 9 dB

Rectifier charge current MPCC = 0 0.5 0.8 1.1 μA

Rectifier charge current MPCC = 1 0.2 0.4 0.7 μA

Rectifier discharge current 0.5 1 - mA

39. Quality detector

39.1 a

Min. quality detector coefficient

QDC 0.5 0.6 0.7 -

22/77 Doc ID 16048 Rev 1

TDA7541B Electrical specifications and characteristics

Table 8. Stereo decoder section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

39.2 a

Max. quality detector coefficient

QDC 0.9 1.05 1.2 -

39.3 b Min. quality noise gain QNG 5 6 7 dB

39.4 b Max. quality noise gain QNG 13 15 17 dB

1. Intermodulation suppression

signal @1 kHz,()

---------------------------------------------------------------

spurious @1 kHz,()

signal @1 kHz,()

---------------------------------------------------------------

spurious @1 kHz,()

measured with: 91 % stereo signal; 9 % pilot signal; fm = 10 kHz or 13 kHz.

2. Traffic radio (V.F.) suppression

a57 V W F,,()

------------------------------------------------------------------------------------------=

measured with: 91% stereo signal; 9% pilot signal; fm=1 kHz; 5% sub carrier (f=57 kHz, fm=23 Hz AM, m=60 %)

3. SCA (subsidiary communications authorization)

signal @1 kHz,()

---------------------------------------------------------------

a67

spurious @9 kHz,()

measured with: 81 % mono signal; 9 % pilot signal; fm=1 kHz; 10 % SCA - sub carrier (f

ƒs 2 10 kHz×()19 kH z–()=;=

ƒs 3 13 kHz×()38 kH z–()=;=

signal @1 kHz,()

spurious @1 kHz,()23 k H z±

ƒs 2 38 kHz×()67 kH z–()=;=

= 67 kHz, unmodulated)

4. ACI (adjacent channel interference)

signal @1 kHz,()

---------------------------------------------------------------

a114

spurious @4 kHz,()

signal @1 kHz,()

---------------------------------------------------------------

a190

spurious @4 kHz,()

measured with: 90 % mono signal; 9 % pilot signal; fm=1 kHz; 1% spurious signal (f

5. All thresholds are measured in test mode at the quality output. The thresholds are calculated by V be adjusted by applying a 150 kHz sinewave at MPXIN.

ƒs 110 k Hz 2 38 kHz×()–()=;=

ƒs 186 k H z 5 38 k Hz×()–()=;=

= 110 kHz or 186 kHz, unmodulated)

NBTH

- V

PEAK

. V

PEAK

can

Doc ID 16048 Rev 1 23/77

Electrical specifications and characteristics TDA7541B

3.3.5 PLL section

T V

amb MPX

= 25 °C, V

= 500 mV

= V

CC1

mono, f = 1 kHz, de-emphasis τ = 50 µs, in application circuit, unless

rms

CC2

= V

CCMIX1

= V

CCVCO

= V

CCIF

= 8.5 V, f

= 10.25 MHz,

Xtal

otherwise specified.

Table 9. PLL section

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

40. Voltage controlled oscillator (VCO)

40.1 f

40.2 f

VCOmin

VCOmax

40.3 C/N Carrier-to-noise-ratio

Min. VCO frequency - 160 - - MHz

Max. VCO frequency - - - 260 MHz

= 200 MHz, Δf=1 kHz,

VCO

B = 1 Hz, Q

loaded

=60

-80-dBc/

√Hz

41. Crystal oscillator

41.1 f

41.2 C/N Carrier-to-noise-ratio f

41.3 V

41.4 C

29-32

41.5 C

41.6 C

41.7 Δf/f Deviation versus V

Crystal frequency - - 10.25 - MHz

xtal

=10.25 MHz, Δf=10 kHz 110 - - dBc/√Hz

xtal

Oscillator output voltage - - 400 - mV

Input capacitance - - 2.5 - pF

Min. cap. Step XTAL - 0.75 - pF

step

Max. cap. XTAL - 23.25 - pF

max

Δ VCC=1 V - 1.5 - ppm/V

rms

41.8 Δf/f Deviation versus T -40 °C<T<+85 °C - 0.2 - ppm/K

42. Charge pump current

42.1 -I

42.2 I

42.3 -I

42.4 I

42.5 -I

42.6 I

42.7 -I

42.8 I

Source current

Sink current - 50 - μA

Source current

Sink current - 500 - μA

Source current

Sink current - 1 - mA

Source current - 1.9 - mA

Sink current - 1.9 - mA

= 2.5 V

ICP, V

= 2.5 V

-50- μA

-550- μA

-1- mA

43. Loop filter input/output

43.1 -I

43.2 I

43.3 V

43.4 V

43.5 I

43.6 I

OUT

Input leakage current VIN = GND: PD

Input leakage current VIN = VREF1 PD

Output voltage Low I

Output voltage High I

Output current, sink V

Output current, source V

= -0.2 mA - 0.05 0.5 V

OUT

= 0.2 mA

OUT

= 1 V to V

OUT

= 1 V to V

OUT

= Tristate -0.1 - 0.1 μA

OUT

CCVCO

24/77 Doc ID 16048 Rev 1

= Tristate -0.1 - 0.1 μA

CCVCO

0.5

CCVCO

0.05

-V

-1 V - - 10 mA

-1 V -10 - - mA

TDA7541B Electrical specifications and characteristics

Table 9. PLL section (continued)

Item Symbol Parameter Test conditions Min. Typ. Max. Unit

44. Output of tuning voltage (TV)

44.1 V

44.2 IV

44.3 IV

44.4

44.5 R

44.6 R

ΔV Additional offset voltage TVM=1, TVO+ - 3.175 - V

Output voltage - 0.5 -

OUT

I Min. voltage step TVO - 25 - mV

step

I Max. voltage offset TVO - 3175 - mV

max

Output impedance TVM=0 - 40 - kΩ

OUT

Output impedance TVM=1 - 20 - kΩ

OUT

45. SSTOP output (open collector)

VCO

0.5

45.1 V

45.2 V

45.3 -I

45.4 I

45.5 V

45.6 V

37SSTH

27SSTH

46. Switch output

46.1 V

46.2 V

46.3 -I

46.4 I

46.5 V

46.6 V

46.7 I

Output voltage low I24 = -200 μA -0.20.5 V

Output voltage high - - - 5 V

Output leakage current V 24 = 5 V -0.1 - 0.1 μA

Output current, sink V 24 = 0.5 V to 5 V - 1 mA

Internal unfiltered field strength threshold for

SSTH, FMON=1 2.6 - 4.1 V

SSTOP=HIGH

Internal unfiltered field strength threshold for SSTOP=HIGH

SSTH, FMON=0 SL = “011”

1.2 - 4.8 V

Output Voltage low SWM”1”,SW”0”, I24 = -5 µA - 0.35 0.5 V

Output Voltage high SWM”1”,SW”1” - VCC-1 - V

Output leakage current V22=5 V -0.5 - 0.5 μA

Output Current, sink - - - 7 mA

Output Voltage low SWM”0”,SW”0”, I22=0 µA - 0.1 0.3 V

Output Voltage high SWM”0”,SW”1”, I22=1 mA - VCC-1 - V

Output Current, sink V22=5 V -7 - - mA

Doc ID 16048 Rev 1 25/77

Functional description TDA7541B

4 Functional description

4.1 FM part

4.1.1 Mixer 1 AGC and IF amplifier

FM quadrate I/Q-mixer converts FM RF to IF1 of 10.7 MHz. The mixer provides inherent image rejection and wide dynamic range with low noise and large input signal performance. For accurate image rejection the phase-error of I/Q can be compensated by software (PH).

It is capable of tuning the US FM, US weather (dedicated WB input), Europe FM, Japan FM and East Europe FM bands:

– US FM = 87.9 to 107.9 MHz – US weather = 162.4 to 162.55 MHz – Europe FM = 87.5 to 108 MHz – Japan FM = 76 to 91 MHz – East Europe FM = 65.8 to 74 MHz

The AGC operates on different sensitivities and bandwidths in order to improve the input sensitivity and dynamic range. AGC thresholds are programmable by software (RFAGC, IFAGC, and KAGC). The output signal is a controlled current for pin diode attenuator.

A 10.7 MHz programmable amplifier (IFG) correct the IF ceramic insertion loss and the costumer level plan application.

4.1.2 Mixer2, limiter, FM demodulator and spike cancellation

In the 2nd mixer stage the first 10.7 MHz IF is converted into the second 450 kHz IF.

The fully integrated sample and hold FM demodulator including spike cancellation (DSB) converts the IF signal from the 450 kHz limiter (limiter gain 80 dB typ.) to the FM multiplex output signal with very low distortion.

The sensitivity of spike blanking can be set via I

C bus.

4.1.3 Quality detection and ISS

Field strength

Parallel to mixer2 input a 10.7 MHz limiter generates a signal for digital IF counter and field strength voltage V adjacent channel and multi path detection and is available at PIN27 (FSU) in a range of 0 V to 5 V. The offset and slope of FSU signal can be adjusted via I application adaptation.

The voltage VFSWO including offset adjust is externally filtered at PIN37 (FSWO) and used for weak signal mute function and generation of ISS filter control signals in weak signal condition. It is possible to combine the IF counter result with this voltage VFSWO by programmable comparator threshold (SSTH).

. This internal voltage V

FSUint

is used for AM IF noise blanker,

FSUint

C bus (FSWO and SL) for

26/77 Doc ID 16048 Rev 1

TDA7541B Functional description

Adjacent channel detector

The input of the adjacent channel detector is AC coupled from VFSW. A programmable high-pass or band-pass (ACF) as well as rectifier generate a signal which is compared with adjustable threshold (ACTH). The output signals of this comparator is controlling the charge and discharge of the external capacitor at PIN30 or PIN31 (dependent on SEEK) with programmable discharge current (TISS). The level at PIN30/31 is used to generate the two digital signal ac and ac+ for ISS control. The adjacent channel information behind the rectifier is available as analog output signal at the multiplexer output (PIN23).

Multipath detector

The input of the multi path detector is AC coupled from internal VFSW too. After filtering with 19 kHz band-pass and rectifying, this voltage is compared with an adjustable threshold (MPTH). The output signal of this comparator can be used to switch off the adjacent channel detection. This influence is selectable by I

The multi path information behind the rectifier is available as analog output signal at multiplexer output (PIN23).

C bus (MPENA).

450 kHz IF narrow band pass filter (ISS filter)

The device has an additional 450 kHz IF narrow band-pass filter for suppression of noise and adjacent channel signal influences. This narrow filter has three switchable bandwidths, narrow range of 80 kHz, mid range of 120 kHz and 22 kHz for weather band information. Without ISS (Intelligent Selectivity System) filter the IF bandwidth (wide range) is defined only by ceramic filter chain and mixer2 bandwidth. The filter is located between mixer2 output buffer and 450 kHz limiter stage. The centre frequency is matched to the demodulator centre frequency.

Deviation detector

In order to avoid distortion in audio output signal the narrow ISS filter is switched OFF if over deviation is present. Hence the demodulator output signal is detected. After AC coupling, low-pass filtering and peak rectifying this signal is charging/discharging the external DEVTC capacitor by an IIC programmable charge/discharge current (TDEV). The voltage at DEVTC is compared with adjustable thresholds (DWTH, DTH) and generates two digital control signals (dev, dev+). For weak signal condition the deviation threshold depends on FSWO.

ISS switch logic

All digital control signals coming from adjacent channel detector, deviation detector and weak signal mute are acting via switching matrix on ISS filter switch. IF2 narrow band-pass switch mode is controlled also by software (ISSENA, ISSON, WBON, ISSBW, and BWDEF). The switching of the IF band-pass is also possible to influence by external manipulation of DC voltage at PIN30.

The influence of the ISS software control on the functionality of the ISS filter is described in

Ta bl e 1 0 . The value “X” for the control bit means the bit does not influence the filter control in

this condition.

Doc ID 16048 Rev 1 27/77

Functional description TDA7541B

Table 10. ISS filter control by I

I2C control bits

ISSENA adr4/d2

ISSON adr11/d0

ISSBW adr7/d0

WBON adr11/d1

ISSM adr9/d7

BWDEF adr7/d1

0XXXXXISS filter is switched off (bypass)

1 1 0 X X X ISS filter is in manual control mode, Band width is 120 kHz

1 1 1 X X X ISS filter is in manual control mode, Band width is 80 kHz

11X1XX

10XX00

10XX10

100X01

100X11

101X01

101X11

ISS filter is in manual control mode, Band width is 22 kHz This setting must be used for weather band application

ISS filter is in automatic control mode Filter activation and band width defined by control table mode1

ISS filter is in automatic control mode Filter activation and band width defined by control table mode2

ISS filter is in automatic control mode Filter activation defined by control table mode1 band width fixed to 120 kHz

ISS filter is in automatic control mode Filter activation defined by control table mode2

band width fixed to 120 kHz

ISS filter is in automatic control mode Filter activation defined by control table mode1 band width fixed to 80 kHz

ISS filter is in automatic control mode Filter activation defined by control table mode2 band width fixed to 80 kHz

C bus

Notes

Description of I2C bits:

ISSENA

ISS filter enable

“1”: ISS filter control enabled

“0”: ISS filter is switched off (bypass of the filter, wide)

ISSON

ISS filter control mode

“1”: ISS filter is in manual control mode (switched "ON"); the bits ISSBW and WBON are defining the bandwidth

“0”: ISS filter is in automatic control mode according to mode1/2 table

ISSBW

ISS filter band width

“1”: 80 kHz

28/77 Doc ID 16048 Rev 1

TDA7541B Functional description

“0”: 120 kHz

The bit has only influence if bit BWENA is “1”, or if bit ISSON is “1”

WBON

Weather band enable

“1”: Weather band enable (FMmixer1 is disabled, Wbmixer1enabled, stereo decoder gain 26dB, ISS filter bandwidth 22 kHz, IF2Q=”00”)

“0”: Weather band disable

For weather band enable it is need to set ISSON = “1”

ISSM

ISS filter application mode

“0”: ISS filter application mode1

“1”: ISS filter application mode2

If BWENA is “1” the band width is always switched to ISSBW in case of ISS filter activated

BWDEF

Enable bit ISSBW for ISS filter band with control

“1”: ISS filter is internally controlled, but band width is defined by bit ISSBW

“0”: ISS filter is internally controlled, band width is defined by mode1/2 table

For the internal control two application modes are available (ISSM). The conditions and settings are described in Ta bl e 1 1 and Tab le 1 2.

4.1.4 Block diagram quality detection principle

(without overdeviation correction)

Table 11. Internal ISS control signals

Signal Low High

Ac No adjacent channel Adjacent channel present

ac+ No strong adjacent channel Adjacent channel higher as ac

Dev Deviation lower as threshold DWTH Deviation higher as threshold DWTH

dev+ Deviation lower as threshold DTH*DWTH Deviation higher as threshold DTH*DWTH

Inton ISS filter off by logic (wide) ISS filter on by logic

int80 ISS filter 120 kHz (mid) ISS filter 80 kHz (narrow)

Field strength higher as weak signal mute threshold

Field strength lower as weak signal mute threshold

Doc ID 16048 Rev 1 29/77

Functional description TDA7541B

Table 12. ISS control modes

Input signals Mode1 Mode2

ac ac+ sm dev dev+ inton int80 Function inton int80 Function

0000000wide0 0wide

0001000wide0 0wide

0001100wide0 0wide

0010011narrow1 1narrow

0011000wide1 0 mid

0011100wide0 0wide

1000011narrow1 0 mid

1100011narrow1 1narrow

1001010mid1 0 mid

1101110mid1 1narrow

4.1.5 Strong adjacent channel correction

Under strong adjacent channel it is possible to have disturbance of the audio signal created by interference between ISS filter control (deviation detection) and adjacent channel mute.

The control bits SACCE and SACCT can be used to avoid this disturbance. If the function is activated (SACCE = “1”) the IF counter together with the internal field strength is used to suppress a malfunction of deviation detection. The bit SACCT is changing the sensitivity of the SACC block (SACCT = “1” means higher sensitivity).

Figure 10 shows the ISS block diagram including the SACC function.

Note: The IF counter must be switched ON if this function is used (Addr25D4 = “1”)

4.1.6 Weak signal mute

The filtered field strength signal (FSWO) is the reference for soft slope mute control in weak signal condition to eliminate audible effects. The start point and mute depth are programmable (WMTH, WMD) in a wide range. These settings together with FSWO bits are influencing the weak signal mute behavior. The time constant is defined by external capacitance at PIN 42. Additional adjacent channel mute function is supported. A high pass filter with -3 dB threshold frequency of 100 kHz, amplifier and peak rectifier generates an adjacent noise signal from Demodulator output. This value is compared with adjustable threshold (ACMTH). For present strong adjacent channel the MPX signal is additional attenuated (ACMD) and has the same time constant as weak signal mute.

30/77 Doc ID 16048 Rev 1

TDA7541B Functional description

4.1.7 Weather band input

If the weather band input is used the chip must be set in FM mode (FMON). In addition to that the ISS filter must be switched ON (ISSENA=”1”), mixer2 quality factor must be set to IF2Q=”00” and the ISS filter must be set in manual control mode (ISSON=”1”).

The bit WBON is:

● activating the WB input

● switching the ISS filter in WB mode (22 kHz band width)

● switching the stereo decoder InGain to 26 dB.

In order to increase the selectivity in weather band mode the AM 450kHz ceramic filter can be used in series to the ISS filter by activating ADSEL (please refer to Figure 10, ISS block diagram and Section 4.2.1, usage of bit ADSEL).

4.2 AM section

signals, narrow band information (DAGC) referred to PIN 56, up conversion signal (IFAGC) at PIN 61 and wide band information (RFAGC) at PIN 3.This gain control gives two output signals. The first one is a current for pin diode attenuator and the second one is a voltage for preamplifier. Time constant of RF and IF-AGC is defined by internal 100 kΩ resistor and external capacitor at PIN 54. The intervention points for AGC (DAGC, IFAGC and RFAGC) are programmable by software. The oscillator frequency for upconversion-mixer1 is generated by dividing the VCO frequency after VCO divider (VCOD) and AM pre-divider (AMD).

Two 10.7 MHz ceramic filters before mixer2 input increase 900 kHz attenuation.

The AMIF2 block contains mixer2, IF2 amplifier, demodulator and AGC2 The AM/FM mixer2 converts 10.7 MHz IF1 into 450 kHz IF2. Mixer2 output passes a 450 kHz narrow band filter (LC plus ceramic filter). LC centre frequency is adjustable by I

C bus (IF2A). The following IF2 amplifier provides signal for fully integrated demodulator. If the bit ADSEL is activated, the ISS filter is inserted between IF2 amplifier and demodulator in order to increase the selectivity (please refer to Figure 11, AM path block diagram and Section 4.2.1, usage of bit ADSEL).

Mixer2 and IF2 amplifier have a 2-stage AGC with careful take-over behavior to keep distortion low. The IF2 AGC range is about 55 dB.

The input signal of IF2 amplifier is used in limiter circuit for in-band level detection. The electrical characteristics are described in FM section.

The demodulator is a peak detector to generate the audio output signal.

At the MUX output the AMIF stereo is available.

AM IF noise blanker

In order to remove in AM short spikes a noise cancellation conception is used in 450 kHz IF AM level. The advantage is to avoid long narrow AGC- and demodulator- time constants, which enlarge spike influences on audio signal and makes difficult to remove it in audio path.

The 10.7 MHz AM IF signal behind IF1 amplifier generates via limitation an unweighted field strength signal including slope of noise spike. The comparison of this detected slope between fast and slow rectifier ignores audio modulation whereby the threshold of slow

Doc ID 16048 Rev 1 31/77

Functional description TDA7541B

rectifier is programmable (AINBT). A comparator activates a pulse generator. The duration of this pulse is software programmable (AINT) and is smooth blanking out the spikes in mixer2.

4.2.1 Usage of control bit ADSEL (Addr23D7)

The control bit ADSEL can be used to increase the selectivity of the application in AM mode and WB mode. In FM it has no function. Table 12 shows the functionality of the control bit.

Table 13. Usage of ADSEL

FMON WBON ADSEL

Note

Addr4D7 Addr11D1 Addr23D7

1 0 X Standard FM mode

Weather band mode using 450 kHz ceramic filter; ISS filter must be manually switched on in order to limit the band

11 0

11 1

0 0 0 Standard AM mode

00 1

width at 450 kHz IF (ISSENA/ISSON = "1"); 450 kHz ceramic filter is switched in series to ISS filter to

increase selectivity

Standard weather band mode; ISS filter must be manually switched on in order to limit the band

width at 450 kHz IF (ISSENA/ISSON = "1")

AM mode using ISS filter; ISS filter (22 kHz band width) is switched in series to the 450 kHz

ceramic filter

01 XNot allowed

4.3 Stereo decoder

4.3.1 Decoder

The stereo decoder-part of the TDA7541B contains all functions necessary to demodulate the MPX-signal, like pilot tone-dependent MONO/STEREO switching as well as the stereo blend and high cut.

Adaptations like programmable input gain, roll-off compensation, selectable de-emphasis time constant and a programmable field strength input allow easy adoption to different applications.

The 4 and noise and acts as an anti-aliasing filter for the following switch capacitor filters.

Demodulator

In the demodulator block the left and the right channel are separated from the MPX-signal. In this stage also the 19 kHz pilot tone is canceled. For reaching a high channel separation the TDA7541B offers an I compensate the low pass behavior of the tuner section. Within the compensation range an adjustment to obtain about 40 dB channel separation is possible. The bits for this adjustment are located together with the level gain adjustment in one byte. This gives the

order input filter has a corner frequency of 80 kHz and is used to attenuate spikes

C bus programmable roll-off adjustment, which is able to

32/77 Doc ID 16048 Rev 1

TDA7541B Functional description

possibility to perform an optimization step during the production of the car radio where the channel separation and the field strength control are trimmed.

In addition to that the FM signal can be inverted.

De-emphasis and high cut

The de-emphasis low pass allows to choose between a time constant of 50 µs/75 µs (DEEMP). The high cut control range will be in both cases T cut control range (between VHCHT and VHCLT) the LEVEL signal is converted into a 5-bit word, which controls the low pass time constant between T resolution will remain 5 bits referred to the voltage range between the VHCHT- and minimum VHCLT-values.

The high cut function can be switched off by I

C-bus.

Figure 3. Programming of HC filter

High Cut Filter Time Constant

3*T

Deemp

HCMax

= 2 x T

Deemp

...3 x T

. Inside the high

. Thereby the

Deemp

FSTC*

HCLT

HCHT

In AM mode (FMON = 0) the DEEMP bit together with the AM corner frequency bits (AMCF) can be used as programmable AM frequency response. The maximum corner frequency is defined by T

, the minimum is defined by 3 x T

Deemp

For the over all frequency

Deemp

response it is need to take into account the frequency response of the AF output at MPXOUT and the Stereo decoder demodulator too.

19 kHz PLL and pilot tone detector

The PLL has the task to lock on the 19 kHz pilot tone during a stereo-transmission to allow a correct demodulation. The included pilot tone-detector enables the demodulation if the pilot tone reaches the selected pilot tone threshold VPTHST. Two different thresholds are available. The status of the detector output can be checked by reading the status byte of the TDA7541B via I

C bus or by reading the STEREO status at MUX pin23.

Field strength control

The field strength input is used to control the high cut- and the stereo blend-function. In addition the signal can be also used to control the noise blanker thresholds and as input for the multipath detector.

Level input and gain

As level input for the stereo decoder is used the FSU voltage (pin 27). Applying a capacitor at FSTC (pin28) a desired time constant can by reached together with the internal resistor of

Doc ID 16048 Rev 1 33/77

Functional description TDA7541B

10k between FSU pin and FSTC pin. The second stage is a programmable gain stage to adapt the VFSTC signal internally. The gain (LG) is widely programmable in 16 steps from 0 dB to 8.25 dB (step=0.55dB).

hese 4 bits are located together with the Roll-Off

compensation bits in byte 14 to simplify a possible adaptation during the production of the car radio.

Stereo blend control

The stereo blend control block converts the internal LEVEL-voltage into a demodulator compatible analog signal, which is used to control the channel separation between 0dB and the maximum separation. Internally this control range has a fixed upper limit, which is the internal reference voltage VREF1. The lower limit can be programmed between 29 and 58 % of VREF1 in 4 % steps. In order to adjust the external voltage VFSTC to the internal control range two values must be defined: the Level gain LG and VSBL. Full channel separation is reached when the internal level voltage (VST) becomes bigger than VREF1. Therefore the following equation can be used to estimate the gain:

The MONO-voltage VMO (0dB channel separation) can be chosen selecting SBC.

Figure 4. Programming of stereo blend

----------------------------------------------------=

FSTC

REF1

@ fullstereo

High cut control

The high cut control set-up is similar to the stereo blend control set-up: the starting point VHCH can be set with 2 bits to be 42, 50, 58 or 66 % of VREF1 whereas the range can be set to be 11, 18.3, 25.7 or 33 % of VHCH.

4.3.2 Noise blanker

In the automotive environment spikes produced for example by the ignition or the wipermotor disturb the MPX-signal. The aim of the noise blanker part is to cancel the audible influence of the spikes. Therefore the output of the stereo decoder is held at the actual voltage for a time between 22 ms and 38 ms (programmable).

In a first stage the spikes must be detected but to avoid a wrong triggering on high frequency (white) noise a complex trigger control is implemented. Behind the trigger stage a pulse former generates the "blanking"-pulse. An own biasing circuit supplies the noise blanker in order to avoid any cross talk to the signal path.

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TDA7541B Functional description

Trigger p ath

The incoming FM demodulator output signal is taken in front of the weak signal mute, high pass filtered, amplified and rectified. This second order high pass filter has a cornerfrequency of 140 kHz. The rectified signal, VRECT, is low pass filtered to generate a signal called V resulting voltage can be adjusted by use of the noise rectifier discharge current. The V voltage is fed to a threshold generator, which adds to the V VTH. Both signals, V

. Noise with a frequency above 140 kHz increases the V

PEAK

RECT

and V

+VTH are fed to a comparator, which triggers a re-

PEAK

voltage. The

PEAK

voltage a DC threshold

PEAK

triggerable monoflop. The output of the monoflop activates the sample-and-hold circuit in the signal path for the selected duration.

Automatic noise controlled threshold adjustment

There are mainly two independent possibilities for programming the trigger threshold:

1. Low threshold in 8 steps (NBLT)

2. Noise adjusted threshold in 4 steps (NBCT).

The low threshold is active in combination with a good MPX signal without any noise; the V

voltage is less than 1V. The sensitivity in this operation is high.

PEAK

If the MPX signal is noisy (low field strength) the V noise, which is also rectified. With increasing of the V increases, too. This particular gain is programmable in 4 steps (NBCT).

voltage increases due to the higher

PEAK

voltage the trigger threshold

PEAK

Figure 5. Adaptive threshold control of noise blanker

VTH

1200 mV (00)

950 mV (01)

700 mV (10)

450 mV (11)

Noise Contr olled Trig. Threshol d

Min. Trig. T hreshold

200 mV

8 STEPS

147 mV

0.8 V

Peak1.5 V

Automatic stereo blend controlled threshold adjustment

Besides the noise controlled threshold adjustment there is an additional possibility for influencing the noise blanker trigger threshold using the bits NBFC. This influence depends on the stereo blend control. The point where the MPX signal starts to become noisy is fixed by the RF part. This point is also the starting point of the normal noise-controlled trigger adjustment. But in some cases the noise blanker can create a wrong triggering, which create distortion, already in the region of mono/stereo transition. Therefore an opportunity to control the V

voltage by the stereo blend function it is implemented.

PEAK

Doc ID 16048 Rev 1 35/77

Functional description TDA7541B

Figure 6. Stereo blend controlled threshold adjust

PEAK

MONO STEREO

≈

2.0V (00)

1.6V (01)

NOISE

1.4V (10)

ATC_SB OFF (11)

0.8V

noisy signal go od signal

Automatic deviation controlled threshold adjustment

If the system is tuned to stations with a high deviation the noise blanker can trigger on the higher frequencies of the modulation. To avoid this wrong behavior, which causes noise in the output signal, the noise blanker offers a deviation-dependent threshold adjustment. By rectifying the MPX signal a further signal representing the actual deviation is obtained. It is used to increase the PEAK voltage. The gain of this circuit is programmable in 3 steps (NBDC) of the stereo decoder-byte (the first step turns off the detector).

Figure 7. Deviation controlled threshold adjust

PEAK

[V ]

2.0

1.5

1.0

0.8

20 32.5 45 75

Detector off

DEVIATION [KHz]

Multipath influence on noise blanker

To react on high repetitive spikes caused by a Multipath-situation, the discharge-time of the V

voltage can be decreased depending on the voltage-level at Pin MPTC. There are

PEAK

two ways to do this.

a) Switch on the linear influence of the Multipath-Level on the PEAK-signal. In this

case the discharge slew rate is 1 V/ms. The slew rate is measured with R = infinite and VMPTC = 2.5 V

b) Activate a function, which switches to the 18k discharge resistor if the Multipath-

Level is below 2.5 V. If multipath influence on noise blanker is switched ON than MPF bit has to be set to 0.

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Discharge

TDA7541B Functional description

Noise blanker in AM mode

In AM mode the noise blanker is activated if a spike on the audio signal is bigger than a fixed threshold. In order to blank the whole spike in AM mode the hold time of the S&H circuit is much longer than in FM mode (64 0µs -1,2 ms). It is not recommended to use the AM noise blanker without to use the AMIF noise blanker inside the tuner.

4.3.3 Functional description of the multipath detector

Using the internal multi path detector the audible effects of a multi path condition can be minimized. A multi path condition is detected by rectifying the 19 kHz spectrum in the field strength signal. An external capacitor is used to define the attack- and decay-times. The MPTC pin is used as detector output connected to a capacitor. Using this configuration an external adaptation to the user's requirement is possible without affecting the "normal" field strength input (FSTC) for the stereo decoder.

To keep the old value of the multi path detector during an alternative frequency jump, the MPFAST bit can disconnect the external capacitor.

Selecting MPINT the channel separation is automatically reduced during a multipath condition according to the voltage appearing at the MPTC pin.

To obtain a good multipath performance an adaptation is necessary. Therefore the gain of the 19 kHz band pass is programmable in four steps (MPG) and the rectifier gain is programmable in four steps (MPRG). The attack- and decay-times can be set by the external capacitor value and the multipath detector charge current MPCC.

4.3.4 Quality detector

The TDA7541B offers a quality detector output, which gives a voltage representing the FMreception conditions. To calculate this voltage the MPX-noise and the multipath-detector output are summed according to the following formula:

The V

Qual

signal is described in noise blanker session. The factor 'a' can be programmed

PEAK

0.8 b V

PEAK

0.8–()aV

from 0.6 to 1.05 (QDC) and the factor b can be programmed from 6 dB to 15 dB (QNG). The quality output voltage can be read at the MUX pin. The MUX pin is a low impedance output and is able to drive external circuitry as well as simply fed to an AD-converter for RDS applications.

4.3.5 AFS control and stereo decoder mute

In case of AFS (alternative frequency search) jump it is recommended to set the stereo decoder in mute condition (SDM) and in addition to set the SEEK mode. Since these two bits are placed in the first written byte, this can be done in the same write cycle as the PLL jump. The stereo decoder mute is high impedance mute, which means the charge on the coupling capacitor will be kept. Simultaneously the pilot detector circuit of the stereo decoder is switched into hold mode. The SEEK mode is switching the multi path detector into fast mode. The external capacitor at MPTC is disconnected from multipath detector which keeps the stereo blend condition, but makes the quality information in fast mode available at the MUX pin.

–()⋅+⋅⋅=

REF1VMPTC

Doc ID 16048 Rev 1 37/77

Functional description TDA7541B

4.4 PLL and IF counter section

4.4.1 PLL frequency synthesizer block

This part contains a frequency synthesizer and a loop filter for radio tuning system. Only one VCO is required to build a complete PLL system for FM world tuning and AM up conversion.

VCO and dividers

The varactor tuned LC oscillator together with the dividers provides the local oscillator signal for both AM and FM front-end mixers. The VCO has an operating frequency of approximately 160 MHz to 260 MHz. In FM mode the VCO frequency is divided (VCOD) by 1, 2 or 3. These dividers generate in-phase and quadrature-phase output signals using in FM mixer for image rejection.

In AM mode the divided VCO frequency is additional pre-divided (AMD) by 4, 6, 8 or 10 dependent on selected AM band.

PLL frequency generation for phase comparison

The VCO divided signals applies a two modulus counter (32/33), which is controlled by a 5bit A-divider. The 5-bit register (PC0 to PC4) controls this divider. In parallel the output of the swallow counter is connected to an 11-bit B-divider. The 11-bit PC register (PC5 to PC15) controls this divider. Dividing range behind VCO divider:

VCOdiv

Warning: For correct operation: A ≤ 32; B ≥ A

32 B⋅ A32++[]ƒ

⋅=

REF

Crystal oscillator

The crystal oscillator provides 10.25 MHz signal for conversion from IF1 to IF2 as well as switching signals for ISS- and quality detection filter. Furthermore reference dividers generate from adjustable crystal frequency (XTAL) reference frequencies for the tuning PLL, IF counter and FM demodulator.

The various reference frequencies f

of PLL (RC) can be chosen by IIC-bus.

REF

Three state phase comparator

The phase comparator generates a phase error signal according to phase difference between f

SYN

and f

. This phase error signal drives the charge pump current generator.

REF

Charge pump current generator

This system generator signed pulses of current. The phase error signal decides the duration and polarity of those pulses. The current absolute values are programmable by register ICP.

In lock detector

After reaching a phase difference about lower than 40 ns the inlock detector is automatically switching the charge-pump in low current mode (LDENA).

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TDA7541B Functional description

Low noise CMOS op-amp

An internal voltage divider at pin 19 connects the positive input of the low noise op-amp. The charge pump output connects the negative input. This internal amplifier in cooperation with external components can provide an active filter. The negative input is switchable to two input pins, to increase the flexibility in application. While the high current mode is activated LPHC output is switched on.

Antenna DAC

For tuning of FM antenna tank circuit two different modes are available (TVM). One is the auto-alignment measurement of VCO tuning voltage with offset of 8-bit DAC (TVO). The other one is an adjustment of 8-bit DAC independent on PLL tracking. For big differences between VCO tuning voltage and antenna tank control voltage an additional constant offset voltage can be switched to antenna circuit (TVO+).

4.4.2 IF counter block

The aim of IF counter is it to measure the intermediate frequency of the tuner. The input signals are the output level of 10.7 MHz IF-limiter in FM and output level of 450 kHz IFlimiter in AM.

The grade of integration is adjustable by different measuring cycle times (IFS). The tolerance of the accepted count value is adjustable too (EW), to reach an optimum compromise for search speed and precision of the evaluation.

Sampling timer

A sampling timer generates the gate signal for the main counter. The basically sampling time are in FM 6.25 kHz (t asynchronous divider to generate several sampling times.

Intermediate frequency main counter

This counter is an 11 - 21-bit synchronous auto reload down counter. The counter length is automatic adjusted to the chosen sampling time and the counter mode (FM or AM).

At the start the counter will be loaded with a defined value which is an equivalent to the divider value (t

If a correct frequency is applied to the IF counter frequency input at the end of the sampling time the main counter is changing its state. This is detected by control logic and an external search stop output is changing from LOW to HIGH.

The IF counter is started only by the in lock information from the PLL part.

Sample

x fIF).

4.5 I2C bus interface

The TDA7541B supports the I2C bus protocol. This protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The device that controls the transfer is a master and device being controlled is the slave. The master will always initiate data transfer and provide the clock to transmit or receive operations.

= 160 s) and in AM 1 kHz (t

TIM

= 1 ms). This is followed by an

TIM

Doc ID 16048 Rev 1 39/77

Functional description TDA7541B

Data transition

Data transition on the SDA line must only occur when the clock SCL is LOW. SDA transitions while SCL is HIGH will be interpreted as START or STOP condition.

Start condition

A start condition is defined by a HIGH to LOW transition of the SDA line while SCL is at a stable HIGH level. This "START" condition must precede any command and initiate a data transfer onto the bus. The device continuously monitors the SDA and SCL lines for a valid START and will not response to any command if this condition has not been met.

Stop condition

A STOP condition is defined by a LOW to HIGH transition of the SDA while the SCL line is at a stable HIGH level. This condition terminates the communication between the devices and forces the bus-interface of the device into the initial condition.

Acknowledge

Indicates a successful data transfer. The transmitter will release the bus after sending 8 bits of data. During the 9 it receives the eight bits of data.

clock cycle the receiver will pull the SDA line to LOW level to indicate

Data transfer

During data transfer the device samples the SDA line on the leading edge of the SCL clock. Therefore, for proper device operation the SDA line must be stable during the SCL LOW to HIGH transition.

Device addressing

To start the communication between two devices, the bus master must initiate a start instruction sequence, followed by an eight bit word corresponding to the address of the device it is addressing.

The most significant 6 bits of the slave address are the device type identifier.

The TDA7541B device type is fixed as "110001".

The next significant bit is used to address a particular device of the previous defined type connected to the bus.

The state of the hardwired PIN 57 defines the state of this address bit. Using this feature up to two devices could be connected on the same bus. When PIN 57 is connected to VCC via an external resistor of about 82 kΩ the address bit "1" is selected. Please note: in this case the AM part doesn't work. Otherwise the address bit "0" is selected (FM and AM is working). Therefore a double FM tuner concept is possible.

The last bit of the start instruction defines the type of operation to be performed:

– When set to "1", a read operation is selected

– When set to "0", a write operation is selected

The TDA7541B connected to the bus will compare their own hardwired address with the slave address being transmitted, after detecting a START condition. After this comparison, the TDA7541B will generate an "acknowledge" on the SDA line and will do either a read or a write operation according to the state of R/W bit.

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TDA7541B Functional description

Write operation

Following a START condition the master sends a slave address word with the R/W bit set to "0". The device will generate an "acknowledge" after this first transmission and will wait for a second word (the word address field). This 8-bit address field provides an access to any of the 32 internal addresses. Upon receipt of the word address the TDA7541B slave device will respond with an "acknowledge". At this time, all the following words transmitted to the TDA7541B will be considered as Data. The internal address will be automatically incremented. After each word receipt the TDA7541B will answer with an "acknowledge".

Read operation

If the master sends a slave address word with the R/W bit set to "1", the TDA7541B will transmit one 8-bit data word. This data word includes the following informations.

bit0 (ISS filter, 1 = ON, 0 = OFF)

bit1 (ISS filter bandwidth, 1 = 80 kHz, 0 = 120 kHz)

bit2 (STEREO, 1 = STEREO, 0 = MONO)

bit3 (1 = PLL is locked in, 0 = PLL is locked out).

bit4 (fieldstrength indicator, 1 = lower as softmute threshold,

0 = higher as softmute threshold)

bit5 (adjacent channel indicator, 1 = adjacent channel present,

0 = no adjacent channel)

bit6 (deviation indicator, 1 = strong overdeviation present,

0 = no strong overdeviation)

bit7 (deviation indicator, 1 = overdeviation present,

0 = no overdeviation)

Doc ID 16048 Rev 1 41/77

Software specification TDA7541B

5 Software specification

5.1 Chip address and overview

The interface protocol comprises:

– start condition (S) – chip address byte – sub address byte – sequence of data (N bytes + Acknowledge) – stop condition (P)

Receive mode

S110001D0ACK00IA4A3A2A1A0ACKDATABYTEACK P

Transmission mode

S110001D1ACKR7R6R5R4R3R2R1S0ACK P

S= Start

P= Stop

ACK = Acknowledge

D = Device address

I = Auto increment mode

A = Sub address

R = Read bit

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TDA7541B Software specification

5.2 Address organization

Table 14. Address organization

Function Addr D7 D6 D5 D4 D3 D2 D1 D0

T PLL charge pump 0 SEEK ASFC LM SDM LDENA ICP2 ICP1 ICP0

T PLL counter 1 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0

T PLL counter 2 PC15 PC14 PC13 PC12 PC11 PC10 PC9 PC8

T TV 3 TVO7 TVO6 TVO5 TVO4 TVO3 TVO2 TVO1 TVO0

T TV/IF counter 4 FMON EW6 EW5 IFS4 IFS3 ISSENA TVM TVO+

T PLL divider 5 AMD7 AMD6 RC5 RC4 RC3 VCOD2 VCOD1 VCOD0

T AGC 6 LNA7 LNA6 DAGC5 DAGC4 IFAGC3 IFAGC2 RFAGC1 RFAGC0

T Quality AC 7 TISS7 TISS6 TISS5 ACTH4 ACTH3 ACF BWDEF ISSBW

T Quality ACM/MP 8 MPTH7 MPTH6 MPAC MPENA ACMD ACMTH2 ACMTH1 ACMTH0

T Quality DEV 9 ISSM DTH6 DTH5 DWTH4 DWTH3 TDEV2 TDEV1 TDEV0

T Quality MUX/FSU 10 SSTH7 SSTH6 SSTH5 SSTH4 SACCT SACCE MUX1 MUX0

T Weak signal mute 11 WMD7 WMD6 WMD5 WMTH4 WMTH3 WMTH2 WBON ISSON

T AM IF NB 12 IFAGCS AINT6 AINT5 AINTH4 AINTH3 AINTH2 AINTH1 AINENA

T XTAL adjust 13 SL7 SL6 SL5 XTAL4 XTAL3 XTAL2 XTAL1 XTAL0

T IF adjust 14 IF1G7 IF1G6 IF2Q5 IF2Q4 IF2A3 IF2A2 IF2A1 IF2A0

T IQ adjust/Switch 15 DSB7 DSB6 SWM SW PH3 PH2 PH1 PH0

T FM keying AGC 16 FSWO7 FSWO6 RFK KAGC4 KAGC3 KAGC2 ODCUR ODENA

SD Roll off 17 LG7 LG6 LG5 LG4 ROC3 ROC2 ROC1 ROC0

SD Stereo blend 18 AMCF7 AMCF6 AMCF5 ASI PTH SBC2 SBC1 SBC0

SD High cut 19 DEEMP HCLT6 HCLT5 HCHT4 HCHT3 HCMAX2 HCMAX1 HCENA

SD MP 20 MS MPFAST MPINT MPCC MPRG3 MPRG2 MPG1 MPG0

SD quality 21 NBFC7 NBFC6 NBDC5 NBDC4 QNG3 QNG2 QDC1 QDC0

SD Audio NB I 22 NBCT7 NBCT6 NBLT5 NBLT4 NBLT3 NBT2 NBT1 NBENA

SD Audio NB II 23 ADSEL PCM VCON NBSMP NBMP NBRR2 NBRR1 NBPC

SD Testing 24------ - -

T PLL/IFC Testing 25 EWEXP IFSEXP 1 1 1 1 1 1

T Testing 26------ - -

T Testing 27------ - -

T Testing 28------ - -

T Testing 29------ - -

Not used 30----- - - -

Not used 31----- - - -

T Tuner

SD Stereo decoder

Data bytes which are unused or dedicated for testing only don't need to be written, because they are set internally to FEH (power on reset condition). But if somebody it writing these bytes they must be written to FEH, otherwise some malfunction of the chip can happen.

Doc ID 16048 Rev 1 43/77

Software specification TDA7541B

5.3 Control register function

Table 15. I2C control bit description

Name

Function

ACF Adjacent channel detector filter select

ACMD Adjacent channel mute depth

ACMTH Adjacent channel mute threshold

ACTH Adjacent channel detector threshold

ADSEL Additional selectivity

AINENA AM IF noise blanker enable

AINT AM IF noise blanking time

AINTH AM IF noise blanker threshold

AMCF Stereo decoder attenuation @ 3.5 kHz

AMD AM VCO pre-divider

ASFC Alternative station frequency check in FM (AGC and weak signal mute on hold)

ASI Audio signal inversion

BWDEF Enables bit ISSBW for ISS bandwidth control

DAGC AM narrow band AGC threshold

DEEMP Stereo decoder de-emphasis

DSB FM demodulator spike blanker

DTH Deviation detector threshold for ISS filter “OFF”

DWTH Deviation detector threshold for ISS filter 120 kHz

EW IF counter frequency error window

EWEXP Expanded IF counter error window

FMON Internal switch FM-AM mode

FSWO Weighted fieldstrength with offset adjust

HCENA High cut enable

HCHT Start level high cut

HCLT Stop level high cut

HCMAX Maximum high cut depth

ICP Charge pump current tuner PLL

IF1G IF1 Amplifier Gain

IF2A IF2 LC band pass fine adjust

IF2Q IF2 LC band pass quality adjust

IFAGC FM/AM IF AGC threshold

IFAGCS AM IFAGC threshold shift

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TDA7541B Software specification

Table 15. I2C control bit description (continued)

Name

IFS IF counter sampling time

IFSEXP Expanded IF counter sampling time

ISSBW ISS filter band width select

ISSENA ISS filter enable

ISSON ISS filter control mode

ISSM ISS filter application mode

KAGC FM keying AGC

LDENA Lock detector enable tuner PLL

LG Stereo decoder level gain adjust

LM FM local mode enable

LNA AM LNA Pin/FET mode

MPAC Influence tuner multi path detection on adjacent channel behavior

MPCC Stereo decoder multi path detector charge current

MPENA Tuner multi path detector influence on adjacent channel enable

MPFAST Fast mode of multi path information at quality pin

MPG Multi path detector gain

MPINT Stereo decoder multi path internal influence enable

Function

MPRG Stereo decoder multi path detector rectifier gain

MPTH Tuner multi path detector threshold

MS Mono/Stereo switch fixed (“Forced Mono”)

MUX Output multiplexer for MUX pin

NBENA Audio noise blanker enable

NBCT Audio noise blanker noise controlled threshold

NBDC Audio noise blanker deviation control

NBFC Audio noise blanker field strength control

NBLT Audio noise blanker low threshold

NBMP Stereo decoder multi path influence on peak discharge current

NBPC Audio noise blanker peak charge current

NBRR Audio noise blanker rectifier discharge resistor

NBSMP Strong multi path influence on audio noise blanker

NBT Audio noise blanker time constant

ODCUR Current for over deviation correction

ODENA Over deviation correction enable

PC Tuner PLL counter

Doc ID 16048 Rev 1 45/77

Software specification TDA7541B

Table 15. I2C control bit description (continued)

Name

PCM Pilot cancellation mode

PH IQ mixer phase adjust

PTH Pilot detector threshold

QDC Stereo decoder quality detector coefficient

QNG Stereo decoder quality noise gain

RC Tuner PLL reference counter

RFAGC FM/AM RF AGC threshold

RFK FM RF keying AGC

ROC Stereo decoder roll off compensation

SACCT Strong adjacent channel correction threshold

SACCE Strong adjacent channel correction enable

SBC Stereo blend control

SDM Stereo decoder mute enable

SEEK FM: FMON = 1, ISS time constant change / AM: FMON = 0, AGC2 time constant change

SL S meter slope

SSTH Field strength threshold for seek stop

SW Free programmable switch

Function

SWM Free programmable switch mode

TDEV Time constant for deviation detector

TISS Time constant for ISS filter “ON”/”OFF”

TVM Tuning voltage offset mode

TVO Tuning voltage offset

TVO+ Additional fixed tuning voltage offset

VCOD Tuner VCO divider

VCON STD VCO “ON/OFF”

WBON Weather band mode (ISS filter band width 24 kHz)

WMD Weak signal mute depth

WMTH Weak signal mute start point threshold

XTAL Xtal frequency fine adjust

46/77 Doc ID 16048 Rev 1

TDA7541B Software specification

5.4 Data byte specification

Table 16. Subaddress description

MSB LSB

- - I A4A3A2A1 A0

0000 0Charge pump control

--1011 1Audio noise blanker II

Page mode “OFF”

--0---- -

1 Page mode enable

Table 17. Addr 0 TPLL charge pump control (0Bh)

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

ICP<2:0>

0 0 0 Charge pump current = 50 µA

0 0 1 Charge pump current = 0.5 mA

0 1 0 Charge pump current = 1 mA

- ----

0 1 1 Charge pump current = 1.5 mA

Function

1 1 0 Charge pump current = 3 mA

1 1 1 Charge pump current = 3.5 mA

LDENA

- --- -- -

0 Lock detector disable

1 Lock detector enable

SDM

- -- --- -

0 Stereo decoder mute disable

1 Stereo decoder mute enable

- - ---- -

0 Local mode disable

1 Local mode enable

ASFC

- ----- -

0 Weak signal mute and AGC normal mode in FM

1 Weak signal mute and AGC on hold in FM mode

SEEK

------ -

0 ISS time constant at pin 30 available, AM SEEK “OFF”

1 ISS time constant at pin 31 available, AM SEEK “ON”

Doc ID 16048 Rev 1 47/77

Software specification TDA7541B

Table 18. Addr 1 TPLL Counter 1 (LSB)

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

PC<7:0>

0 0000000LSB = 0

0 0000001LSB = 1

0 0000010LSB = 2

1 1111100LSB = 252

1 1111101LSB = 253

1 1111110LSB = 254

1 1111111LSB = 255

Table 19. Addr 2 TPLL Counter 2 (MSB)

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

PC<15:8>

0 000000 0MSB = 0

0 000000 1MSB = 256

0 000001 0MSB = 512

Function

1 111110 0MSB = 64768

1 111110 1MSB = 65024

1 111111 0MSB = 65280

1 111111 1MSB = 65536

Note: Swallow mode: fVCO/fSYN = LSB + MSB + 32

Table 20. Addr 3 TV(00h)

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

1+TVO

Function

TVO<7:0>

0 0 0 0 0 0 0 Tuning Voltage Offset = 0mV

000000 1TVO = 25 mV

000001 0TVO = 50 mV

111111 0TVO = 3150 mV

111111 1TVO = 3175 mV

-TVO

------ -

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TDA7541B Software specification

Table 21. Addr 4 TV/IF Counter (FM ACh, AM 1Ch)

Addr25 MSB LSB

Function

d7 d6 d7 d6 d5 d4 d3 d2 d1 d0

TVO+

-- - ------

0 Disable additional TV offset

1 Enable additional TV offset + 3.175 V

TVM

-- - ----- -

0 TV is tracking with PLL

1 TV is independing on PLL

ISSENA

-- - ---- - -

0 ISS Filter switched off (bypass of filter, wide)

1 ISS filter control enable

IFS<4:3>

100t

101t

110t

-1 - --11-- -t

000t

001t

010t

011t

= 20.48 ms (FM) 128 ms (AM)

Sample

= 10.24 ms (FM) 64 ms (AM)

Sample

= 5.12 ms (FM) 32 ms (AM)

Sample

= 2.56 ms (FM) 16 ms (AM)

Sample

= 1.28 ms (FM) 8 ms (AM)

Sample

= 0.64 ms (FM) 4 ms (AM)

Sample

= 0.32 ms (FM) 2 ms (AM)

Sample

= 0.16 ms (FM) 1 ms (AM)

Sample

EW<6:5>

100 Δf = 12.5 kHz (FM) 2 kHz (AM)

101 Δf = 25 kHz (FM) 4 kHz (AM)

110 Δf = 50 kHz (FM) 8 kHz (AM)

- - ---- -

111 Δf = 100kHz (FM) 16kHz (AM)

000 Not valid

001 Not valid

010 Not valid

011 Δf = 6.25 kHz (FM) 1 kHz (AM)

FMON

-- 0 ------ -Select AM mode

1 Select FM mode

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Software specification TDA7541B

Table 22. Addr 5 TPLL Divider (FM 3Dh, AM 2Dh)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

VCOD<2:0>

0 0 not valid (only for testing)

0 1 VCO frequency divided by 2

- - - - - 1 0 VCO frequency divided by 3

1 1 original VCO frequency

0 VCO ”I” signal 0 degree

1 VCO “I” signal 180 degree

RC<5:3>

0 1 1 PLL reference frequency 2 kHz

-- ---

0 0 AM VCO predivider ratio 10

0 1----- -AM VCO predivider ratio 8

1 0 AM VCO predivider ratio 6

1 1 AM VCO predivider ratio 4

1 0 0 PLL reference frequency 9 kHz

1 0 1 PLL reference frequency 10 kHz (AM)

1 1 0 PLL reference frequency 25 kHz

1 1 1 PLL reference frequency 50 kHz (FM)

AMD<7:6>

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TDA7541B Software specification

Table 23. Addr 6 AGC (FM 06h, AM 2Ah)

Addr12 MSB LSB

Function

d7 d7 d6 d5 d4 d3 d2 d1 d0

RFAGC<1:0>

= 80 dBµV, AM V3= 92 dBµV

8-10

= 84 dBµV, AM V3= 99 dBµV

8-10

= 88 dBµV, AM V3= 102 dBµV

8-10

= 92 dBµV, AM V3= 104 dBµV

8-10

- - -----

0 0 RFAGC threshold FM V

0 1 RFAGC threshold FM V

1 0 RFAGC threshold FM V

1 1 RFAGC threshold FM V

IFAGC<3:2>

1 0 0 IFAGC threshold FM V61= 82 dBµV, AM V61= 89 dBµV

1 0 1 IFAGC threshold FM V

= 88 dBµV, AM V61= 95 dBµV

1 1 0 IFAGC threshold FM V61= 91 dBµV, AM V61= 99 dBµV

1 - - - - 1 1 - - IFAGC threshold FM V

0 0 0 IFAGC threshold FM V

0 0 1 IFAGC threshold FM V

0 1 0 IFAGC threshold FM V

0 1 1 IFAGC threshold FM V

= 94 dBµV, AM V61= 102 dBµV

= 82 dBµV, AM V61= 79 dBµV

= 88 dBµV, AM V61= 85 dBµV

= 91 dBµV, AM V61= 89 dBµV

= 94 dBµV, AM V61= 92 dBµV

DAGC<5:4>

0 0 DAGC V

--- ----

0 1 DAGC V

= 86 dBµ

= 91 dBµ

1 0 DAGC V56= 95 dBµ

1 1 DAGC V

= 98 dBµ

LNA<7:6>

00 I

- ----- -

01 I

10 I4 = 400 µA + 100 µA, V54 = 3.5 V

11 I

Doc ID 16048 Rev 1 51/77

= 400 µA, V54 = 4.5 V, AM LNA Pin/FET mode ”OFF”

= 400 µA + 50 µA, V54 = 3.5 V

= 400 µA + 100 µA, V54 = 3.5 V

Software specification TDA7541B

Table 24. Addr 7 Quality AC (FM 50h)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

ISSBW

- - - - - - - 0 ISS filter fixed band width 120 kHz

1 ISS filter fixed band width 80 kHz

BWDEF

- - - - - - 0 - Disable bit ISSBW for ISS filter band width control

1 Enable bit ISSBW for ISS filter band width control

ACF

- - - - - 0 - - AC highpass frequency 100 kHz

1 AC bandpass frequency 100 kHz

ACTH<4 :3>

0 0 AC detector threshold 0.35 V

- - - 0 1 - - - AC detector threshold 0.45 V

1 0 AC detector threshold 0.55 V

1 1 AC detector threshold 0.65 V

TISS<7:5>

0 0 0 discharge current 1 µA, charge current mid 74 µA, narrow 124 µA

0 0 1 discharge current 3 µA, charge current mid 72 µA, narrow 122 µA

0 1 0 - - - - - discharge current 5 µA, charge current mid 70 µA, narrow 120 µA

0 1 1 discharge current 7 µA, charge current mid 68 µA, narrow 118 µA

1 1 1 discharge current 15 µA, charge current mid 60 µA, narrow 110 µA

52/77 Doc ID 16048 Rev 1

TDA7541B Software specification

Table 25. Addr 8 Quality ACM/MP (FM 6Ah)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

ACMTH<2:0>

0 0 0 AC mute threshold 60 mV

0 0 1 AC mute threshold 90 mV

-----

0 1 0 AC mute threshold 150 mV

1 1 0 AC mute threshold 240 mV

1 1 1 AC mute OFF

ACMD

- - - - 0 - - - Adjacent channel mute depth -4 dB

1 Adjacent channel mute depth -6 dB

MPENA

- - - 0 - - - - Multipath control “ON”

1 Multipath control “OFF”

MPAC

- - 0 - - - - - Multipath eliminates ac (MPENA = 0)

1 Multipath eliminates ac and ac+

MPTH<7:6>

0 0 MP threshold 0.50 V

0 1 - - - - - - MP threshold 0.75 V

1 0 MP threshold 1.00 V

1 1 MP threshold 1.25 V

(MPENA = 0)

Doc ID 16048 Rev 1 53/77

Software specification TDA7541B

Table 26. Addr 9 Quality Dev (FM 49h)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

TDEV<2:0>

0 0 0 charge current 39 µA, discharge current 1 µA

0 0 1 charge current 38 µA, discharge current 2 µA

- - - - - 0 1 0 charge current 37 µA, discharge current 3 µA

0 1 1 charge current 36 µA, discharge current 4 µA

1 1 0 charge current 33 µA, discharge current 7 µA

1 1 1 charge current 32 µA, discharge current 8 µA

DWTH<4:3>

0 0 DEV threshold for ISS narrow/wide 20 kHz

- - - 0 1 - - - DEV threshold for ISS narrow/wide 30 kHz

1 0 DEV threshold for ISS narrow/wide 40 kHz

1 1 DEV threshold for ISS narrow/wide 50 kHz

DTH<6:5>

0 0 DEV threshold for ISS filter “OFF” ratio 1.5

- 0 1 - - - - - DEV threshold for ISS filter “OFF” ratio 1.4

1 0 DEV threshold for ISS filter “OFF” ratio 1.3

1 1 DEV threshold for ISS filter “OFF” ratio 1

ISSM

0 - - - - - - - ISS filter application mode 1

1 ISS filter application mode 2

54/77 Doc ID 16048 Rev 1

TDA7541B Software specification

Table 27. Addr 10 Quality MUX/FSU (FM 0Eh, AM 0Fh)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

MUX<1:0>

0 0 Detected multipath information at PIN 23

- - - - - - 0 1 Detected adjacent channel information at PIN 23

1 0 Quality information stereo decoder at PIN 23

1 1 FMON=1: Stereo indication at PIN 23

FMON=0: AM IF2 signal at PIN 23

SACCE

- ----01--

Strong adjacent channel correction disable Strong adjacent channel correction enable

SACCT

----01---

Strong adjacent channel correction threshold = 2.9 V Strong adjacent channel correction threshold = 3.0V

SSTH<7:4>

0 0 0 0 SSTOP = IFC (IF counter status)

0 0 0 1 SSTOP = H if IFC = H & FS > (FM: 0.6 V / AM: 1.2 V)

0 0 1 0 - - - - SSTOP = H if IFC = H & FS >

0 0 1 1 SSTOP = H if IFC = H & FS >

0 1 0 0 SSTOP = H if IFC = H & FS >

1 1 1 1 SSTOP = H if IFC = H & FS > (FM: 4.1 V / AM: 4.8 V)

Table 28. Addr 11 Weak Signal Mute (FM A8h)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

ISSON

- ------0ISS filter internal control

1 ISS filter forced “ON”

WBON

- -----0-Weather band disable

1 Weather band enable

WMTH<4:2>

0 0 0 Startpoint mute 0

0 0 1 Startpoint mute 1

- - - 0 1 0 - - Startpoint mute 2

1 1 0 Startpoint mute 6

1 1 1 Startpoint mute 7

WMD<7:5>

0 0 0 Mute depth 0

0 0 1 - - - - - Mute depth 1

1 0 1 Mute depth 5

1 1 1 Mute depth 7

Doc ID 16048 Rev 1 55/77

Software specification TDA7541B

Table 29. Addr 12 AM IF NB (AM B1h)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

AINENA

- - - - - - - 0 AM IF noise blanker disable

1 AM IF noise blanker enable

AINTH<4:1>

0 0 0 0 not recommended

---- 0 0 1 0 not recommended 0 1 0 0 AM IF NB Threshold 50 mV

- - - 0 1 0 1 - AM IF NB Threshold 62.5 mV

---- 1 0 0 0 AM IF NB Threshold 100 mV

---- 1 1 1 1 AM IF NB Threshold 187.5 mV

AINT<6:5>

0 0 AM IF NB Time 8 µs

- 0 1 - - - - - AM IF NB Time 11 µs

1 0 AM IF NB Time 14 µs 1 1 AM IF NB Time 17 µs

IFAGCS

0 - - - - - - - Enable AM IFAGC threshold shift down (check address6) 1 Disable AM IFAGC threshold shift down

Table 30. Addr 13 XTAL adjust(80h)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

XTAL<4:0>

00000C

00001C

- - - 0001 0C

00011C

00100C 11110C

11111C

Load

0pF

0.75 pF

1.5 pF

2.25 pF

3 pF

22.5 pF

23.25 pF

SL<7:5>

0 0 0 S meter slope FM = 0.75 V/20 dB, AM = 1.61 V/20 dB

0 0 1 S meter slope FM = 0.80 V/20 dB, AM = 1.75 V/20 dB

0 1 0 S meter slope FM = 0.85 V/20 dB, AM = 1.89 V/20 dB 0 1 1 - - - - - S meter slope FM = 0.90 V/20 dB, AM = 1.98 V/20 dB

1 0 0 S meter slope FM = 0.95 V/20 dB, AM = 2.04 V/20 dB

1 0 1 S meter slope FM = 1.0 V/20 dB, AM = 2.1 V/20 dB 1 1 0 S meter slope FM = 1.05 V/20 dB, AM = 2.15 V/20 dB

1 1 1 S meter slope FM = 1.1 V/20 dB, AM = 2.20 V/20 dB

56/77 Doc ID 16048 Rev 1

TDA7541B Software specification

Table 31. Addr 14 IF2 adjust (FM E8h, AM 08h)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

IF2A<3:0>

0000C

0001C

----0010C

0011C

0100C

1000C

1111C

0 pF

adj

2,2 pF

adj

4,4 pF

adj

6,6 pF

adj

8,8 pF

adj

17,6 pF

adj

33 pF

adj

IF2Q<5:4>

0 0 no R

--01----R

10 R

11 R

, AM Q=28/gain=26 dB, FM Q=28/gain=16 dB

int

=5 kOhm, FM Q=3/gain=14 dB, BW=150 kHz

int

=4,1 kOhm, FM Q=2,5/gain=14 dB, BW=180 kHz

int

=3,3 kOhm, FM Q=2,05/gain=14 dB, BW=220 kHz

int

IF1G<7:6>

0 0 IF1 gain 9 dB (AM)

0 1 - - - - - - IF1 gain 12 dB

1 0 IF1 gain 17 dB

1 1 IF1 gain 21 dB (FM)

Doc ID 16048 Rev 1 57/77

Software specification TDA7541B

Table 32. Addr 15 IQ adjust / Switch (FM E7h)

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

PH<3:0>

0000-7 degree

0001-6 degree

0010-5 degree

- - - - 0 1 1 1 0 degree

1 0 0 0 1 degree

1 0 0 1 2 degree

1 1 1 0 7 degree

1 1 1 1 8 degree

- - - 0 - - - - S1 LOW output voltage

1 S1 HIGH output voltage

SWM

- - 0 - - - - - S1 emitter output available

Function

1 S1 open collector output available

DSB<7:6>

0 0 FM demodulator spike cancellation ”OFF”

0 1 - - - - - - Threshold for FM demodulator spike cancellation 630 mV

1 0 Threshold for FM demodulator spike cancellation 400 mV

1 1 Threshold for FM demodulator spike cancellation 520 mV

58/77 Doc ID 16048 Rev 1

TDA7541B Software specification

Table 33. Addr 16 FM keying AGC (FM 1Dh)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

ODENA

- - - - - - - 0 Over deviation correction disable

1 Over deviation correction enable

ODCUR

- - - - - - 0 - over deviation correction current max=45 µA

1 over deviation correction current max=90 µA

KAGC<4:2>

0 0 0 KAGC threshold 3,60* V48 /5

0 0 1 KAGC threshold 3,65* V

0 1 0 KAGC threshold 3,70* V

- - - 0 1 1 - - KAGC threshold 3,75* V

1 0 0 KAGC threshold 3,80* V

1 0 1 KAGC threshold 3,85* V

1 1 0 KAGC threshold 3,90* V

1 1 1 Keying AGC “OFF”

RFK

- - 0 - - - - - RF keying AGC OFF

1 RF keying AGC ON

FSWO<7:6>

0 0 FSW offset OFF

0 1 - - - - - - FSW offset = -75 mV

1 0 FSW offset = -150 mV

1 1 FSW offset = -192 mV

Doc ID 16048 Rev 1 59/77

Software specification TDA7541B

Table 34. Addr 17 Roll off / Level gain (77h)

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

ROC<3:0>

0 0 0 0 Roll-Off compensation 25.8 %

0 0 0 1 Roll-Off compensation 24.0 %

0 0 1 0 Roll-Off compensation 22.2 %

0 0 1 1 Roll-Off compensation 20.5 %

0 1 0 0 Roll-Off compensation 18.8 %

0 1 0 1 Roll-Off compensation 17.1 %

0 1 1 0 Roll-Off compensation 15.4 %

- - - - 0 1 1 1 Roll-Off compensation 13.8 %

1 0 0 0 Roll-Off compensation 12.2 %

1 0 0 1 Roll-Off compensation 10.6 %

1 0 1 0 Roll-Off compensation 9.0 %

1 0 1 1 Roll-Off compensation 7.5 %

1 1 0 0 Roll-Off compensation 6.0 %

1 1 0 1 Roll-Off compensation 4.5 %

1 1 1 0 Roll-Off compensation 3,0 %

1 1 1 1 Roll-Off compensation 1.6 %

LG<7:4>

0 0 0 0 Level gain 0 dB

0 0 0 1 Level gain 0.55 dB

0 0 1 0 - - - - Level gain 1.10 dB

0 1 1 1 Level gain 3.85 dB

1 1 1 1 Level gain 8.25 dB

Function

60/77 Doc ID 16048 Rev 1

TDA7541B Software specification

Table 35. Addr 18 SD Stereoblend / AM corner frequency (0Dh)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

SBC<2:0>

0 0 0 Stereoblend control at 29 % REF5V

0 0 1 Stereoblend control at 33 % REF5V

0 1 0 Stereoblend control at 38 % REF5V

- - - - - 0 1 1 Stereoblend control at 42 % REF5V

1 0 0 Stereoblend control at 46 % REF5V

1 0 1 Stereoblend control at 50 % REF5V

1 1 0 Stereoblend control at 54 % REF5V

1 1 1 Stereoblend control at 58 % REF5V

PTH

- - - - 0 - - - Pilot threshold high

1 Pilot threshold low

ASI

- - - 0 - - - - Audio inverter “OFF”

1 Audio inverter “ON”

AMCF<7:5>

0 0 0 AM attenuation @ 3.5 kHz = 8.4 dB

0 0 1 AM attenuation @ 3.5 kHz = 8.0 dB

0 1 0 - - - - - AM attenuation @ 3.5 kHz = 7.3 dB

1 1 0 AM attenuation @ 3.5 kHz = 4.4 dB

1 1 1 AM attenuation @ 3.5 kHz = 3.6 dB

Doc ID 16048 Rev 1 61/77

Software specification TDA7541B

Table 36. Addr 19 SD High cut (2Fh)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

HCENA

- ------0High cut “OFF”

1 High cut “ON”

HCMAX<2:1>

0 0 Maximum high cut 10 dB

- - - - - 0 1 - Maximum high cut 5.5 dB

1 0 Maximum high cut 7.5 dB

1 1 Maximum high cut 8.5 dB

HCHT<4:3>

0 0 Start level high cut @ 42 % REF5V

- - - 0 1 - - - Start level high cut @ 50 % REF5V

1 0 Start level high cut @ 58 % REF5V

1 1 Start level high cut @ 66 % REF5V

HCLT<6:5>

0 0 Stop level high cut @ 11 % V

- 0 1 - - - - - Stop level high cut @ 18.3 % V

1 0 Stop level high cut @ 25.7 % V

1 1 Stop level high cut @ 33 % V

DEEMP

0 - - - - - - - De-emphasis 50 µs

1 De-emphasis 75 µs

HCHT

62/77 Doc ID 16048 Rev 1

TDA7541B Software specification

Table 37. Addr 20 SD MP (FM 97h, AM 3Fh)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

MPG<1:0>

0 0 Multipath detector gain =6 dB

- -----01Multipath detector gain =12 dB

1 0 Multipath detector gain =9 dB

1 1 Multipath detector gain =10.5 dB

MPRG<3:2>

0 0 Multipath detector rectifier gain =7,6 dB

- - - - 0 1 - - Multipath detector rectifier gain =4,6 dB

1 0 Multipath detector rectifier gain =0d B

1 1 Multipath detector rectifier gain disabled

MPCC

- - - 0 - - - - Multipath detector charge current =0,8 µA

1 Multipath detector charge current =0,4 µA

MPINT

- -0---- -Multipath detector internal influence “ON”

1 Multipath detector internal influence “OFF”

MPFAST

0----- -External time constant (MPTC) enable

1 External time constant (MPTC) disable

0 -------Forced MONO

1 MONO/STEREO switch automatically

Doc ID 16048 Rev 1 63/77

Software specification TDA7541B

Table 38. Addr 21 SD Quality (FFM 7Ah, AM FAh)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

QDC<1:0>

0 0 Quality detector coefficient a=0,6

- -----01Quality detector coefficient a=0,75

1 0 Quality detector coefficient a=0,9

1 1 Quality detector coefficient a=1,05

QNG<3:2>

0 0 Quality noise gain =6 dB

- - - - 0 1 - - Quality noise gain =9 dB

1 0 Quality noise gain =12 dB

1 1 Quality noise gain =15 dB

NBDC<5:4>

0 0 Noise blanker deviation adjust 2.0 V

- - 0 1 - - - - Noise blanker deviation adjust 1.5 V

1 0 Noise blanker deviation adjust 1.0 V

1 1 Noise blanker deviation adjust “OFF”

NBFC<7:6>

0 0 Noise blanker field strength adjust 2.0 V

0 1 - - - - - - Noise blanker field strength adjust 1.6 V

1 0 Noise blanker field strength adjust 1.4 V

1 1 Noise blanker field strength adjust “OFF”

64/77 Doc ID 16048 Rev 1

TDA7541B Software specification

Table 39. Addr 22 SD NB I (FM 05h, AM 04h)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

NBENA

- ------ 0Audio noise blanker “OFF”

1 Audio noise blanker “ON”

NBT<2:1>

0 0 Audio noise blanking time 38 µs

- - - - - 0 1 - Audio noise blanking time 25,5 µs

1 0 Audio noise blanking time 32 µs

1 1 Audio noise blanking time 22 µs

NBLT<5:3>

0 0 0 Noise blanker low threshold 280 mV

0 0 1 Noise blanker low threshold 261 mV

0 1 0 Noise blanker low threshold 242 mV

- - 0 1 1 - - - Noise blanker low threshold 223 mV

1 0 0 Noise blanker low threshold 204 mV

1 0 1 Noise blanker low threshold 185 mV

1 1 0 Noise blanker low threshold 166 mV

1 1 1 Noise blanker low threshold 147 mV

NBCT<7:6>

0 0 Noise blanker noise controlled threshold 1200 mV

0 1 - - - - - - Noise blanker noise controlled threshold 950 mV

1 0 Noise blanker noise controlled threshold 700 mV

1 1 Noise blanker noise controlled threshold 450 mV

Doc ID 16048 Rev 1 65/77

Software specification TDA7541B

Table 40. Addr 23 SD NB II (FM E2h, AM C2h)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

NBPC

- - - - - - - 0 Noise blanker peak charge current low

1 Noise blanker peak charge current high

NBRR<2:1>

0 0 Noise rectifier discharge resistor = infinite

- - - - - 0 1 - Noise rectifier discharge resistor =56 k

1 0 Noise rectifier discharge resistor =33 k

1 1 Noise rectifier discharge resistor =18k

NBMP

- - - - 0 - - - Multipath influence on peak discharge “OFF”

1 Multipath influence on peak discharge “ON” (-3 V/ms)

NBSMP

- - - 0 - - - - Strong multipath influence on peak discharge “OFF”

1 Strong multipath influence on peak discharge “ON”

VCON

- - 0 - - - - - Stereo decoder VCO “OFF”

1 Stereo decoder VCO “ON”

PCM

- 0 - - - - - - Pilot cancellation mode: always

1 Pilot cancellation mode: if pilot > pilot threshold

ADSEL

0 - - - - - - - Additional selectivity OFF

1 Additional selectivity ON

66/77 Doc ID 16048 Rev 1

TDA7541B Software specification

Table 41. Addr 24, 26, 27, 28, 29 testing (FEh)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

1 111111 0Only for testing

Table 42. Addr 25 Testing (FEh)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

- - 11111 0Only for testing

IFSEXP

- 0 - - - - - - Enable expand mode of IF sampling time (see addr 4)

1 Disable expand mode of IF sampling time

EWEXP

0 - - - - - - - Enable expand mode of error window (see addr 4)

1 Disable expand mode of error window

Doc ID 16048 Rev 1 67/77

Appendix TDA7541B

6 Appendix

Figure 8. Block diagram FM part

68/77 Doc ID 16048 Rev 1

TDA7541B Appendix

Figure 9. Block diagram VCO

Doc ID 16048 Rev 1 69/77

Appendix TDA7541B

Figure 10. Block diagram ISS function

70/77 Doc ID 16048 Rev 1

TDA7541B Appendix

Figure 11. Block diagram AM path

Doc ID 16048 Rev 1 71/77

Appendix TDA7541B

Figure 12. Block diagram stereo decoder

MPXOUT MPXIN

MUX

MPTC

FSTC

Figure 13. Block diagram audio noise blanker

MPXIN

FMON

RECT

Deviation

detector

NBDC

FMDEMOut

140kHz HPF

(2nd. order)

Rectifier

Integrator

discharge control

NBPC

NBMP

NBRR

NBSMP

PEAK

VTH

FMON

Threshold

generator

NBCT NBLT

Fieldstrenght

adjust

NBFC

Stereo

decoder

S&H NBENA

Monoflop

FM:22-40µs AM:0.3-1.2ms

L/R

NBT

FSTC

MPTC

72/77 Doc ID 16048 Rev 1

TDA7541B Appendix

Figure 14. Block diagram multi path detection for stereo decoder

FSTC

MUX

internal

Attack/Decay

Rectifier

Bandpass

19kHz

MPCC MPFAST/

Rectifier

MPG MPRG

Stereo blend

MPINT

SEEK

MPTC

Doc ID 16048 Rev 1 73/77

Application circuit TDA7541B

7 Application circuit

Figure 15. Application circuit

8.5V

100n

VCC1

FSWO

GNDSTD

XTALD

GNDVCC

3.3n

ISSTC2

330n

ISSTC1

XTALG

FSTC

FSU

SCL

SDA

SSTOP

MUX

LPHC

LPF

VREF2

LPOUT

GNDVCO

100n

FSU

SCL

SDA

SSTOP

MUX

1µ

Q_Loaded 28

10.7MHz 0 .7MHz 450kHz

470n

AM_AF/MPX

470n

22µ

4.7

8.5V

CF3

L=560nH

CF2

CF1

100n

180p

1µ

100n

2.2µ

100n

4.7

8.5V

680n H

330p

1µ

VREF1

GNDVCC2

MIX2AMPOUT

VCC2

MIX2REF

MIX2OUT

AMRFAGCTC

MIX2INREF

MIX2IN

AMAGC2TC

IF1REF

IF1AMPOUT

VCCIF1

IF1AMPIN

GNDIF

MIX1REF

MIX1OUT

2.2µ

AMI F2IN

MPXOUT

GNDDEM

AMIF2REF

FMREFDEMC

100n

470n

MPXIN

MUTETC

AMREFDEMC

TDA7541B

470n

MPTC

220n

8.5V

WB5AMMI X1REF6AMPI NDR

AMRFAGCOUT4AMMI X1IN3DEVTC2VCCMIX 1

330n10100n

FMMIX1IN18GNDRF

FMPINDR

FMMIX1IN210TV11FMAGCTC13VCOB14VCOE15VCCVCO

1µ

100n

100p

8.5V

22n

FM_AM

74/77 Doc ID 16048 Rev 1

AC00706

TDA7541B Package information

8 Package information

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK

packages, depending on their level of environmental compliance. ECOPACK

specifications, grade definitions and product status are available at: www.st.com.

ECOPACK

is an ST trademark.

Figure 16. LQFP64 mechanical data and package dimensions

DIM.

A 1.60 0.063

A1 0.05 0.15 0.002 0.006

A2 1.35 1.40 1.45 0.053 0.055 0.0 57

B 0.17 0.22 0.27

C 0 .09 0.0035

D 11.80 12. 00 12.20 0.464 0.472 0.480

D1 9.80 10.00 10.20 0.386 0.394 0.401

D3 7.50 0.295

e 0.50 0.0197

E 11.80 12.00 12.20 0.464 0.472 0.480

E1 9.80 10.00 10.20 0.386 0.394 0.401

E3 7.50 0 .295

L 0.45 0.60 0.75 0.0177 0.0236 0.0295

L1 1.00 0.0393

K 0˚ (min.), 3.5˚ (min.), 7˚(max.)

ccc 0.080 0.0 031

mm inch

MIN. TYP. MAX . MIN. TYP. MAX.

0.0066 0.0086 0.0106

0.20

0.0079

OUTLINE AND

MECHANICAL DATA

LQFP64 (10 x 10 x 1.4mm)

TQFP64

E3D3E1

0.08mm

Seating Plane

ccc

0051434 F

Doc ID 16048 Rev 1 75/77

Revision history TDA7541B

9 Revision history

Table 43. Document revision history

Date Revision Changes

22-Jul-2009 1 Initial release.

76/77 Doc ID 16048 Rev 1

TDA7541B

Please Read Carefully:

Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice.

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Doc ID 16048 Rev 1 77/77

ST TDA7541B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table 1. Device summary

1 Block circuit diagram

Figure 1. Block circuit diagram

2 Pin connection and pin description

2.1 Pin connection

Figure 2. Pin connection (top view)

2.2 Pin description

Table 2. Pin description

3 Electrical specifications and characteristics

3.1 Thermal data

Table 3. Thermal data

3.2 Absolute maximum ratings

Table 4. Absolute maximum ratings

3.3 Electrical characteristics

3.3.1 Globals

Table 5. Globals

3.3.2 FM section

3.3.3 AM section

Table 7. AM section

3.3.4 Stereo decoder section

3.3.5 PLL section

Table 9. PLL section

4 Functional description

4.1 FM part

4.1.1 Mixer 1 AGC and IF amplifier

4.1.2 Mixer2, limiter, FM demodulator and spike cancellation

4.1.3 Quality detection and ISS

4.1.4 Block diagram quality detection principle

Table 11. Internal ISS control signals

Table 12. ISS control modes

4.1.5 Strong adjacent channel correction

4.1.6 Weak signal mute

4.1.7 Weather band input

4.2 AM section

4.2.1 Usage of control bit ADSEL (Addr23D7)

Table 13. Usage of ADSEL

4.3 Stereo decoder

4.3.1 Decoder

Figure 3. Programming of HC filter

Figure 4. Programming of stereo blend

4.3.2 Noise blanker

Figure 5. Adaptive threshold control of noise blanker

Figure 6. Stereo blend controlled threshold adjust

Figure 7. Deviation controlled threshold adjust

4.3.3 Functional description of the multipath detector

4.3.4 Quality detector

4.3.5 AFS control and stereo decoder mute

4.4 PLL and IF counter section

4.4.1 PLL frequency synthesizer block

4.4.2 IF counter block

4.5 I2C bus interface

5 Software specification

5.1 Chip address and overview

5.2 Address organization

Table 14. Address organization

5.3 Control register function

Table 15. I2C control bit description

5.4 Data byte specification

Table 16. Subaddress description

Table 17. Addr 0 TPLL charge pump control (0Bh)

Table 18. Addr 1 TPLL Counter 1 (LSB)

Table 19. Addr 2 TPLL Counter 2 (MSB)

Table 20. Addr 3 TV(00h)

Table 21. Addr 4 TV/IF Counter (FM ACh, AM 1Ch)

Table 22. Addr 5 TPLL Divider (FM 3Dh, AM 2Dh)

Table 23. Addr 6 AGC (FM 06h, AM 2Ah)

Table 24. Addr 7 Quality AC (FM 50h)

Table 25. Addr 8 Quality ACM/MP (FM 6Ah)

Table 26. Addr 9 Quality Dev (FM 49h)

Table 27. Addr 10 Quality MUX/FSU (FM 0Eh, AM 0Fh)

Table 28. Addr 11 Weak Signal Mute (FM A8h)

Table 29. Addr 12 AM IF NB (AM B1h)

Table 30. Addr 13 XTAL adjust(80h)

Table 31. Addr 14 IF2 adjust (FM E8h, AM 08h)

Table 32. Addr 15 IQ adjust / Switch (FM E7h)

Table 33. Addr 16 FM keying AGC (FM 1Dh)