ST TDA7541 User Manual
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
–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
st
IF 10.7 MHz with image
nd
IF 450 kHz
st
IF 10.7 MHz, AM upconversion
nd
IF 450 kHz
TDA7541
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
– Independend weather band input
– All functions I
Description
The TDA7541 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.
2
C bus controlled
Order code Package Packing
TDA7541 LQFP64 (10 x 10 x 1.4 mm) Tray
TDA7541TR LQFP64 (10 x 10 x 1.4 mm) Tape and reel
TDA7541W LQFP64 (14 x 14 x 1.4 mm) Tray
TDA7541WTR LQFP64 (14 x 14 x 1.4 mm) Tape and reel
June 2009 Doc ID 13686 Rev 4 1/75
www.st.com
1
Contents TDA7541
Contents
1 Block circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Pin connection and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.3.5 PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.1 FM part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.1.1 Mixer 1 AGC and IF amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.1.2 Mixer 2, 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 Weak signal mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.1.6 Weather band input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.2 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.3 Stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.3.1 Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.3.2 Noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.3.3 Functional description of the multipath detector . . . . . . . . . . . . . . . . . . 36
4.3.4 Quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.3.5 AFS control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.4 PLL and IF counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.4.1 PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.4.2 IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2/75 Doc ID 13686 Rev 4
TDA7541 Contents
4.5 I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5 Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.1 Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.2 Control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Appendix A Block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Appendix B Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Doc ID 13686 Rev 4 3/75
List of tables TDA7541
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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. Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 14. I
Table 15. Subaddress description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 16. Addr 0 TPLL charge pump control (0Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 17. Addr 1 TPLL Counter 1 (LSB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 18. Addr 2 TPLL Counter 2 (MSB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 19. Addr 3 TV(00h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 20. Addr 4 TV/IF Counter (FM ACh , AM 1Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 21. Addr 5 TPLL Divider (FM 3Dh , AM 2Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 22. Addr 6 AGC (FM 06h, AM 2Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 23. Addr 7 Quality AC (FM 50h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 24. Addr 8 Quality ACM/MP (FM 6Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 25. Addr 9 Quality Dev (FM 49h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 26. Addr 10 Quality MUX/FSU (FM 0Eh , AM 0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 27. Addr 11 Weak Signal Mute (FM A8h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 28. Addr 12 AM IF NB (AM B1h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 29. Addr 13 XTAL adjust(80h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 30. Addr 14 IF2 adjust (FM E8h, AM 08h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 31. Addr 15 IQ adjust / Switch (FM E7h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 32. Addr 16 FM keying AGC (FM 1Dh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Table 33. Addr 17 Roll off / Level gain (77h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Table 34. Addr 18 SD Stereoblend / AM corner frequency (0Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Table 35. Addr 19 SD High cut (2Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Table 36. Addr 20 SD MP (FM 97h, AM 3Fh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Table 37. Addr 21 SD Quality (FFM 7Ah, AM FAh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Table 38. Addr 22 SD NB I (FM 05h, AM 04h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Table 39. Addr 23 SD NB II (FM E2h, AM C2h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Table 40. Addr 24, 26, 27, 28, 29 testing (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Table 41. Addr 25 Testing (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Table 42. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
2
C control bit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
2
C bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4/75 Doc ID 13686 Rev 4
TDA7541 List of figures
List of figures
Figure 1. Block circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. Programming of HC filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 4. Programming of stereo blend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 5. Adaptive threshold control of noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 6. Stereo blend controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 7. Deviation controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 8. LQFP64 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 9. Block diagram FM part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Figure 10. Block diagram VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 11. Block diagram ISS function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Figure 12. Block diagram AM path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Figure 13. Block diagram stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Figure 14. Block diagram audio noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Figure 15. Block diagram multi path detection for stereo decoder. . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Figure 16. Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Doc ID 13686 Rev 4 5/75
Block circuit diagram TDA7541
1 Block circuit diagram
Figure 1. Block circuit diagram
6/75 Doc ID 13686 Rev 4
TDA7541 Pin connection and pin description
2 Pin connection and pin description
2.1 Pin connections
Figure 2. Pin connections (top view)
VCCMIX1
DEVTC
AMMIX1IN
AMRFAGCOUT
WB
AMMIX1RAF
AMPINDR
FMMIX1IN1
GNDRF
FMMIX1IN2
TV
FMPINDR
FMAGCTC
VCOB
VCOE
VCCVCO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
MIX1OUT
63
64
18
17
GNDIF
MIX1REF
61
62
20
19
VCCIF1
IF1AMPIN
59
60
22
21
IF1REF
IF1AMPOUT
AMAGC2TC
58
57
24
23
AMRFAGCTC
MIX2IN56MIX2INREF
54
55
27
26
25
GNDVCC2
VCC2
MIX2REF
MIX2OUT53MIX2AMPOUT
49
51 50
52
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
VREF1
AMIF2IN
GNDDEM
FMREFDEMC
AMIF2REF
MPXOUT
MUTETC
MPXIN
AMREFDEMC
MPTC
GNDSTD
FSWO
VCC1
R
L
GNDVCC1
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
SW
LPOUT
GNDVCO
LPF
VREF2
LPHC
MUX
SDA
SSTOP
SCL
FSU
FSTC
XTALG
ISSTC1
XTALD
ISSTC2
Doc ID 13686 Rev 4 7/75
Pin connection and pin description TDA7541
Table 2. Pin description (continued)
Pin No. Pin name Function
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
2
25 SDA I
26 SCL I
C Bus Data
2
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
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
8/75 Doc ID 13686 Rev 4
TDA7541 Pin connection and pin description
Table 2. Pin description (continued)
Pin No. Pin name Function
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 13686 Rev 4 9/75
Electrical specifications and characteristics TDA7541
3 Electrical specifications and characteristics
3.1 Thermal data
Table 3. Thermal data
Symbol Parameter Value Unit
R
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
T
V
V
amb
T
ESD
S
stg
3.3 Electrical characteristics
3.3.1 Globals
T
= 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
CC1
CC2
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
10/75 Doc ID 13686 Rev 4
TDA7541 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
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
2
3. I
C bus interface
3.1 f
3.2 V
3.3 V
3.4 I
3.5 V
REF1
REF2
SCL
IL
IH
IN
O
Internal reference voltage I
Internal reference voltage I
Clock frequency - - - 400 kHz
Input low voltage - - - 1 V
Input high voltage - 3 - - V
Input current - -5 - 5 µA
Output acknowledge voltage IO = 1.6mA - - 0.4 V
3.3.2 FM section
T
= 25 °C, V
amb
f
= 98 MHz, dev = 40 kHz, f
RF
Table 6. FM section
CC1
= V
CC2
= 0 mA 4.855.2V
REF1
= 0 mA 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
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”
37
5811-
5. Narrow band IF & keying AGC
5.1 V
5.2 V
5.3 V
5.4 V
5.5 Δ V
Lower threshold start KAGC = off, V
61
Upper threshold start KAGC = off, V
61
Max. IFAGC threshold
61
with KAGC
Start point KAGC KAGC”000”,IFAGC”00”, 3.2 3.4 3.6 V
37
Control range IF KAGC
61
KAGC”000”,IFAGC”00”,
V37 = 3.0 V
KAGC”000”,IFAGC”00”,
= 3.2….3.9 V
V
37
8-10
8-10
= 0 mV
= 0 mV
RMS
RMS
- 82 - dBµV
- 94 - dBµV
- 97 - dBµV
12 15 18 dB
6. AGC time constant output
V
6.1 V
Max. AGC output voltage V
13
8-10
= 0 mV
RMS
--
REF1
+V
BE
V
Doc ID 13686 Rev 4 11/75
Electrical specifications and characteristics TDA7541
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
13
Min. AGC charge current V
13
Max. AGC discharge
13
current
V
8-10
8-10
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
12
AGC OUT, current max. V
12
8-10
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
IN
Input capacitance Differential - 4 - pF
IN
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
l
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
rd
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 R
9.3 V
OUT
Input resistance Single ended 7 10 13 kΩ
IN
Output resistance - 530 660 790 Ω
Input dc bias - 2 2.3 2.6 V
5
9.4 G Gain unloaded 24 26 28 dB
9.5 INOISE Equivalent Input noise Source impedance 400 Ω -2.3 -nV/
rd
9.6 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
10.6 V
OUT
OUT
Input resistance - 265 330 396 Ω
IN
Input capacitance - - 2.5 - pF
IN
DC input voltage - - V
61
/3 - V
CCIF1
Output resistance - 265 330 396 Ω
Output capacitance - - 2.5 - pF
DC output voltage - - V
59
/2 - V
CCIF1
12/75 Doc ID 13686 Rev 4
TDA7541 Electrical specifications and characteristics
Table 6. FM section (continued)
Item Symbol Parameter Test conditions Min. Typ. Max. Unit
10.7 G
10.8 G
10.9 INOISE
10.10 CP
10.11 IIP3 3
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
rd
order Intermodulation referred to 330 Ω input, G
G
max
noise of R
=330 Ω, RL=330 Ω,
gen
not included
gen
max
max
-3.2 -nV/
- 99 - dBµV
- 130 - dBµV
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
OUT
52,53
Input resistance Differential 240 300 360 Ω
IN
Input capacitance - - 2.5 - pF
IN
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
m
transconductance
WB Mode; referred to MIX2OUT - 126 - µA/V
4.3 V
11.8 G Gain FM Mode, referred to MIX2OUT - 14 - 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
rd
order Intermodulation referred to 330 Ω input ,IF2Q”10” - 132 - dBμV
= 330 Ω, IF2Q”10”
R
gen
noise of R
gen
not included
-15 -nV/√Hz
√Hz
12. Demodulator, audio output
12.1 THD Total harmonic distortion
a
12.2 V
12.3 R
R
MPX
OUT
LOAD
12.4 (S+N)/N
AM suppression
AM
MPX output signal Dev.= 75 kHz 440 500 560 mV
Output impedance - 20 40 60 Ω
Load resistance - 10 - - kΩ
Signal plus noise-to-noise
ratio at MPXOUT
Dev.= 75 kHz, V
IF2Q”11”
V
=100 dBµ, Δf = 40 KHz,
56
=1 kHz,
f
mod
=1 kHz@AM, m =0.3 %
f
mod
Δf = 40 kHz, f
V
=100 dBµV,
56
Deemphasis = 50 µs,
= 100 dBµV,
56
=1 kHz,
mod
-0.10.3%
40 60 - dB
RMS
70 - - dB
B = 200 Hz to 15 kHz
ISSENA = 0
Doc ID 13686 Rev 4 13/75
Electrical specifications and characteristics TDA7541
Table 6. FM section (continued)
Item Symbol Parameter Test conditions Min. Typ. Max. Unit
Signal plus noise-to-noise
12.5 (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
13.9 V
OUT
DC output voltage
37
DC output voltage
37
DC output voltage
37
DC output voltage
37
Slope - - 25 - mV/dB
37
DC offset - -200 0 mV
37
Output impedance FSWO 17 23.5 30 kΩ
DC output voltage
27
DC output voltage
27
Δf = 1.5 kHz, f
=100 dBµV,
V
56
mod
=1 kHz,
Deemphasis = 75 µs,
setting see Ta bl e 1 0
= 20 dBμV, FMON=1,
V
56
FSWO = OFF
= 50 dBμV, FMON=1,
V
56
FSWO = OFF
V
= 70 dBμV, FMON=1,
56
FSWO = OFF
V
> 120 dBμV, FMON=1,
56
FSWO = OFF
= 20 dBμV, FMON=1,
V
56
SL=”101”
= 50 dBμV, FMON=1,
V
56
SL=”101”
40 - - dB
-2.5 - V
-3 -V
-3.5 - V
-4.6 - V
-0.10.4V
-1 -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
13.19 ΔV
13.20 f
27
27
27
OUT
load
27
27
27
27
27
LP
V
= 70 dBμV, FMON=1,
DC output voltage
DC output voltage
56
SL=”101”
> 120 dBμV, FMON=1,
V
56
SL=”101”
-2 -V
4- -V
Slope - 50 - mV/dB
Output impedance FSU 320 400 480 Ω
Load resistor FSU - 20 - kΩ
DC output voltage AM
DC output voltage AM
DC output voltage AM
DC output voltage AM
47
SL= ”010”
V
= 40 dBμV, FMON = 0,
47
SL= ”010”
= 60 dBμV, FMON = 0,
V
47
SL= ”010”
> 100 dBμV, FMON = 0,
V
47
SL= ”010”
-0.10.3V
-1.25 - V
-3.0 - V
4.5 - - V
= 20 dBμV, FMON = 0,
V
Slope AM FMON=0 - 90 - mV/dB
-3 dB frequency low pass
AM
FMON=0 - 40 - kHz
14/75 Doc ID 13686 Rev 4
TDA7541 Electrical specifications and characteristics
Table 6. FM section (continued)
Item Symbol Parameter Test conditions Min. Typ. Max. Unit
Adjacent channel gain
13.21 G
Gain - - 32 - dB
AC
Adjacent channel filter
13.22 f
13.23 f
13.24 f
HP
-20dB
BP
-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
MP
Multipath bandpass filter
13.26 f
Centre frequency - - 19 - kHz
C
13.27 Q Quality factor - 5 8 10 -
14. ISS (intelligent selectivity system) filter 450kHz
14.1 f
centre
Centre frequency f
REF_intern
= 450 kHz - 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 - tbd - kHz
Adjacent channel ISS filter threshold
14.8 V
14.9 V
THAC
THAC
Internal low threshold ACTH - 2.75 - V
Internal high threshold ACTH - 3.05 - V
Multipath threshold
14.10 V
14.11 V
THMP
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
14.17 I
14.18 V
14.19 V
30,31
30,31
30,31
30,31
30,31
30,31
30,31
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
Discharge current low TISS, BWDEF = 0 0.5 1 1.5 µA
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
TISS, BWDEF = 1 -132 -110 -88 µA
Doc ID 13686 Rev 4 15/75
Electrical specifications and characteristics TDA7541
Table 6. FM section (continued)
Item Symbol Parameter Test conditions Min. Typ. Max. Unit
ISS filter switch threshold
14.20 V
14.21 V
14.22 V
14.23 V
30,31
30,31
30,31
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
3
Charge current high TDEV -48 -39 -30 µA
3
Discharge current low TDEV 0.5 1 1.5 µA
3
Discharge current high TDEV 5.5 8 10.5 µA
3
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
Upper start point
37
Lower start point
37
WMTH = 0, WMD = 7, V
AF = -3 dB
WMTH = 7, WMD = 7, V
AF = -3 dB
IN=V56
IN=V56
,
-2.9 - V
,
-2.7 - V
15.3 a
15.4 a
15.5 a
15.6 V
15.7 a
15.8 I
15.9 I
WMD
WMD
MTHISS
ACMTH
ACMD
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
42
Discharge current - 1.5 2.5 4 μA
42
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
23
Output voltage high - 4.6 4.9 - V
23
Output resistance - 200 250 300 Ω
Load resistor - 20 - - kΩ
=OFF 10 14 - dB
56
WMD, WMTH, V
IN=V56
-1 -dB
ACMTH 40 - 260 mV
16/75 Doc ID 13686 Rev 4
TDA7541 Electrical specifications and characteristics
3.3.3 AM section
T
= 25 °C, V
amb
f
= 1 MHz, m = 30%, f
RF
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
IF
Min. RF AGC threshold
3
Max. RF AGC threshold - 104 - dBµV
3
Min. IF AGC threshold
61
Max. IF AGC threshold - 102 - dBµV
61
Min. DAGC threshold
56
Max. DAGC threshold - 98 - dBµV
56
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
3
= 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
4
Min. AGC output voltage - - - 0.5 V
4
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
7
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
IN
Input capacitance differential - tbd - pF
IN
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
rd
order intermodulation - - 132 - dBμV
nV/√Hz
20.8 G Gain With 330 Ω filter 35.57 dB
Doc ID 13686 Rev 4 17/75
Electrical specifications and characteristics TDA7541
Table 7. AM section (continued)
Item Symbol Parameter Test conditions Min. Typ. Max. Unit
21. AM mixer2
21.1 R
21.2 C
21.3 V
21.4 R
21.5 C
21.6 V
21.7 g
21.8 G
55.56
OUT
OUT
52,53
max
Input resistance - 265 330 396 Ω
IN
Input capacitance - - 2.5 - pF
IN
DC input voltage - 3.8 4 4.2 V
Output resistance - 100 - - kΩ
Output capacitance - - 2.5 - pF
DC output voltage - 3.7 4.0 4.3 V
Conversion
m
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
rd
order Intermodulation A
, R
A
max
noise of R
max
max
= 330 Ω, RL = 2 kΩ,
gen
gen
not included
-11-
, referred to 330 Ω input -114-dBμV
, referred to 330 Ω input -132-dBμV
nV/
22. Buffer AM mixer2
√H
z
22.1 R
22.2 C
22.3 V
OUT
OUT
Output resistance - 1.6 2 2.4 kΩ
Output capacitance - 2.5 pF
DC output voltage - 3.7 4.0 4.3 V
50
22.4 G gain R
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
23.8 IIP3 3
23.9 V
Input resistance - 1.6 2 2.4 kΩ
IN
Input capacitance - 2.5 pF
IN
DC input voltage - 4.1 4.3 4.5 V
Max. gain - 495255 dB
Equivalent input noise
voltage
1 dB compression point G
1dB
rd
order Intermodulation G
IF2 output voltage V56 = 90 dBV, m = off 140 190 240
23
= 2 kΩ -8 -6 -4 dB
L
, R
G
max
noise of R
max
max
= 2 kΩ,
gen
not included
gen
-9.5-
, referred to 2 kΩ input -74-dBμV
, referred to 2 kΩ input -100-dBμV
nV/√Hz
mV
RMS
18/75 Doc ID 13686 Rev 4
TDA7541 Electrical specifications and characteristics
Table 7. AM section (continued)
Item Symbol Parameter Test conditions Min. Typ. Max. Unit
24. AMAGC2
24.1 V
24.2
AGC(start)
ΔAGC AGC2 range
24.3 g
24.4 g
24.5 II
24.6 II
24.7 V
24.8 V
AGC
AGC
57
57
AGC start voltage (PIN47) Input carrier voltage - 62 - dBµV
Control slope Seek mode - 50 - µA/V
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
57
Min. AGC output voltage V47 = 20 dBµ - 0.2 0.5 V
57
25. AM audio output
25.1 V
Audio output voltage
43
25.2
THD Total harmonic distortion
25.3
25.4 R
OUT
Output impedance - 20 25 30 Ω
26. IF noise blanking
Between start of AGC2
and the intervention point
of prestage AGC
= 90 dBµ, m = 30 %,
V
56
f
= 1KHz
mod
V
= 90 dBµ, m = 30 %,
56
f
= 1 kHz
mod
= 90 dBµ, m = 80%,
V
56
= 1 kHz
f
mod
50 55 - dB
170 200 230
mV
-0.30.5
-0.50.9
RM
S
%
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
bl
Max. blanking time - - 17 - μs
bl
Min internal threshold - - 50 - mV
th
Max. internal threshold - -
th
Threshold step - - 12.5 - mV
187.5
-mV
Doc ID 13686 Rev 4 19/75
Electrical specifications and characteristics TDA7541
3.3.4 Stereo decoder
T
= 25 °C, V
amb
V
= 500 mV
MPX
otherwise specified.
Table 8. Stereo decoder section
Item Symbol Parameter Test conditions Min. Typ. Max. Unit
27. Stereo decoder
= V
CC1
mono, f = 1 kHz, deemphasis τ = 50 µs, in application circuit, unless
rms
CC2
= V
CCMIX1
= V
CCVCO
= V
CCIF
= 8.5 V, f
= 10.25 MHz,
Xtal
27.1
--0.50.93
Vin MPX input level
27.2 WBON = 1 - 0.05 0.06
27.3 R
27.4 G
27.5 G
STDWB
27.6 SVRR
27.7 A channel separation
Input resistance - 80 100 120 kΩ
in
Stereo decoder gain - 2 2.5 3 dB
STD
Stereo decoder gain Weather band mode 23 26 27 dB
Supply voltage ripple
rejection
= 100 mV, f = 1 kHz - 60 - dB
V
ripple
V
= 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
V
rms
rms
rms
rms
rms
29.1 f
lock
29.2 DP Pilot deviation range f
Capture range Pilot magnitude 20 mV
= 19 kHz 4 - 30 %
pilot
30. Deemphasis and highcut
30.1 t
30.2 t
30.3 t
30.4 t
30.5 A
HC50
HC75
HC50
HC75
Ammin
Deemphasis time
constant
Deemphasis time
constant
Highcut time constant
Highcut time constant
Min. Attenuation in AM
DEEMP=0, High Cut OFF 45 50 55 μs
DEEMP = 1, High Cut OFF 67 75 83 μs
DEEMP = 0, High Cut ON,
=0.1V
V
28
DEEMP= 1, High Cut ON,
V
= 0.1 V
28
Voutmax/Vout@ f = 3.5 kHz,
DEEMP = 0, AMCF “111”
20/75 Doc ID 13686 Rev 4
= 4 % 18.9 - 19.1 kHz
rms
135 150 165 μs
200 225 250 μs
4.5 6.5 8.5 dB
TDA7541 Electrical specifications and characteristics
Table 8. Stereo decoder section (continued)
Item Symbol Parameter Test conditions Min. Typ. Max. Unit
30.6 A
Ammax
Max. Attenuation in AM
Voutmax/Vout@ f = 3.5 kHz,
DEEMP= 0, AMCF “000”
11 14 17 dB
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
31.9 VHCH
31.10 VHCL
31.11 VHCL
31.12 VHCL
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 highcut HCHT 37 42 47 %V
min
Max.voltage for no highcut HCHT 61 66 71 %V
max
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
REF1
REF1
REF1
REF1
REF1
REF1
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
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)
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
TRMIN
TRMAX
Min. trigger threshold
Max. trigger threshold
(5)
(5)
V
=0.8 V, NBLT “111” - 147 - mV
PEAK
V
=0.8 V, NBLT “000” - 280 - mV
PEAK
OP
OP
Doc ID 13686 Rev 4 21/75
Electrical specifications and characteristics TDA7541
Table 8. Stereo decoder section (continued)
Item Symbol Parameter Test conditions Min. Typ. Max. Unit
37.3 V
37.4 V
TRNOISE
TRNOISE
37.5 V
37.6 V
37.7 V
37.8 V
37.9 V
37.10 V
37.11 V
PEAKDEV
PEAKDEV
PEAKFS
PEAKFS
37.12 T
37.13 T
37.14 SR
37.15 SR
PEAK
PEAK
PEAK
S
S
PEAK
PEAK
Min. noise controlled
trigger threshold
Max. noise controlled
trigger threshold
= 1.5 V, NBCT “11” - 450 - mV
V
PEAK
V
= 1.5 V, NBCT “00” - 1200 - mV
PEAK
Peak voltage NBRR “00”, V
Peak voltage
Peak voltage
Min. deviation dependent
peak voltage
Max. deviation dependent
peak voltage
Min. fieldstrength
controlled peak voltage
Max. fieldstrength
controlled peak voltage
Min. blanking time
Max. blanking time
Noise rectifier charge
Noise rectifier charge
NBRR “00”, V
f = 150 kHz
NBRR “00”, V
f = 150 kHz
V
= 500 mV,
MPX
NBDC = 11 (“OFF”)
V
= 500 mV, NBDC= 00 - 2.0 - V
MPX
=0mV, V
V
MPX
(fully mono), NBFC = 11 (“OFF”)
=0mV, V
V
MPX
(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
= 0 mV - 0.8 - V
MPX
= 50 mV,
MPX
MPX
= 200 mV,
-1.9- V
-3.5- V
-0.8- V
<< V
LEVEL
LEVEL
<< V
SBL
SBL
-0.8- V
-2.0- V
-38- μs
-22- μs
-5-mV/μs
-12-mV/μs
OP
OP
37.16 V
37.17 V
37.18 V
37.19 V
37.20 V
37.21 V
37.22 V
RECTADJ
RECTADJ
RECTADJ
RECTADJ
ADJMP
ADJMP
ADJMP
Noise rectifier discharge
adjustment
Noise rectifier discharge
adjustment
Noise rectifier discharge
adjustment
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
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,
V
MPTC
NBRR=01
Signal PEAK in testmode,
= 1V, NBSMP = 1,
V
MPTC
NBMP = 0, NBRR = 01
Signal PEAK in testmode,
=1 V, MBSMP=1,
V
MPTC
NBMP=1, NBRR=01
22/75 Doc ID 13686 Rev 4
- 0.3 - V/ms
- 1.8 - V/ms
- 2.8 - V/ms
-4-V/ms
-3-V/ms
-4-
- 5.2 - V/ms
TDA7541 Electrical specifications and characteristics
Table 8. Stereo decoder section (continued)
Item Symbol Parameter Test conditions Min. Typ. Max. Unit
38. Multipath detector
38.1 G
38.2 G
38.3 G
38.4 G
RECTMP
RECTMP
38.5 I
38.6 I
38.7 I
CHMP
CHMP
DISMP
Min. multipath gain MPG = 00 5 6 7 dB
MP
Max. multipath gain MPG = 11 11 12 13 dB
MP
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
39.2 a
Min. quality detector
coefficient
Max. quality detector
coefficient
QDC 0.5 0.6 0.7 -
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
V
signal @1 kHz,()
o
---------------------------------------------------------------
a2
V
spurious @1 kHz,()
o
signal @1 kHz,()
V
o
---------------------------------------------------------------
a3
V
spurious @1 kHz,()
o
measured with: 91 % stereo signal; 9 % pilot signal; fm = 10 kHz or 13 kHz.
2. Traffic radio (V.F.) suppression
ƒs 2 10 kHz×()19 kH z–()=;=
ƒs 3 13 kHz×()38 kH z–()=;=
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)
V
signal @1 kHz,()
o
---------------------------------------------------------------
a67
V
spurious @9 kHz,()
o
measured with: 81 % mono signal; 9 % pilot signal; fm=1 kHz; 10 % SCA - sub carrier (f
4. ACI (adjacent channel interference)
signal @1 kHz,()
V
o
---------------------------------------------------------------
a114
V
spurious @4 kHz,()
o
V
signal @1 kHz,()
o
---------------------------------------------------------------
a190
V
spurious @4 kHz,()
o
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.
------------------------------------------------------------------------------------------=
V
spurious @1 kHz,()23 k H z±
o
ƒs 2 38 kHz×()67 kH z–()=;=
ƒs 110 kH z 2 38 kHz×()–()=;=
ƒs 186 kH z 5 38 k Hz×()–()=;=
= 67 kHz, unmodulated)
S
= 110 kHz or 186 kHz, unmodulated)
S
- V
NBTH
PEAK
signal @1 kHz,()
V
o
Doc ID 13686 Rev 4 23/75
. V
PEAK
can
Loading...