Datasheet TDA7540B Datasheet (ST)

CD00108485 Rev 1.0 ACTIVE PAGE A

AM/FM Car Radio Tuner IC with Stereo Decoder and Intelligent

Selectivity System (ISS)

Datasheet

DOCUMENT HISTORY

Version Release Date Change Qualifier

Rev 1.0 Initial Release

Initial Edocs version

CD00108485 Rev 1.0 ACTIVE PAGE B

DOCUMENT APPROVAL

Name Function Date

Brasca, Guido Market Com 11−May−2006

Bosisio, Savino Corporate Com 11−May−2006

CD00108485 Rev 1.0 ACTIVE PAGE C

REFERENCED DOCUMENTS

Document Id Document Type Document Title Relation Name

No References

CD00108485 Rev 1.0 ACTIVE PAGE D

CUSTOM ATTRIBUTES

Alternate Identifier(s) 12326
Alternate Name
Confidentiality Level Public
ECN Number
Original ID
Original Repository
Revalidation Date
Status ACTIVE
Publishing scope Public
Root Part Number(s) TDA7540B

DOCUMENT CD00108485 REVISION 1.0 ACTIVE DATE 11-May-2006 page: 1/75

TDA7540B

AM/FM Car Radio Tuner IC with Stereo Decoder and

Intelligent Selectivity System (ISS)

Features

FM-Part

■ RF AGC generation by RF and IF detection

■ I/Q mixer for 1st FM IF 10.7MHz with image

rejection

■ Mixer for 2nd IF 450kHz

■ Internal 450KHz bandpass filter with bandwidth

control by ISS

■ Fully integrated FM-demodulator with spike

cancellation

AM-Part

■ Wide and narrow AGC generation

■ Mixer for 1st IF 10.7MHz, AM upconversion

■ Mixer for 2nd IF 450kHz, AM downconversion

■ Integrated AM-demodulator

■ AM IF- and audio noise blanking

Stereodecoder

■ 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

■ Internal noise blanker with several threshold

controls

Additional Features

■ VCO for world tuning range

■ 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

■ All functions I

Description

The TDA7540 is a high performance tuner circuit
for AM/FM car radio. It contains mixer, IF
amplifier, demodulator for AM and FM,
stereodecoder, 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.

TQFP80

2

C-Bus controlled

Order codes

Part number Temp range, °CPackage Packing

TDA7540B -40 to 85 TQFP80 Tube

May 2006 Rev 1 1/75

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Contents TDA7540B

Contents

1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Pins description and connection diagrams . . . . . . . . . . . . . . . . . . . . . . 5

2.1 TQFP80 pins connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.3 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.2.1 Globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.2.2 FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2.3 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.2.4 Stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.2.5 PLL section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.1 FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.1.1 Mixer1, AGC and 1.IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.1.2 Mixer2, limiter and demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.1.3 Quality detection and ISS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.1.4 Soft mute control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.2 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.3 Stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.3.1 Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.3.2 Functional description of the noise blanker . . . . . . . . . . . . . . . . . . . . . . 29

4.3.3 Functional description of the multipath-detector . . . . . . . . . . . . . . . . . . 30

4.3.4 Quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.3.5 AFS control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.4 PLL and if counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.4.1 PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.4.2 IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.5 I2C-Bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

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TDA7540B Contents

4.5.1 Data transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

4.5.2 Start condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

4.5.3 Stop condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.5.4 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.5.5 Data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.5.6 Device addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.5.7 Write operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.5.8 Read operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

5 Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

5.1 Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

5.2 Control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5.2.1 Data Byte Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

6 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

7 Part List (Application and measurment circuit) . . . . . . . . . . . . . . . . . . 70

8 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

9 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

10 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

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Block diagram TDA7540B

1 Block diagram

Figure 1. Block circuit diagram

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TDA7540B Pins description and connection diagrams

2 Pins description and connection diagrams

2.1 TQFP80 pins connection diagram

Figure 2. TQFP80 pins connection (top view)

IF1AMP1IN

IF1REF

IF1AMP1OUT

VCCIF1

IF1AMP2IN

AMDETC

IF1AMP2OUT

AMRFAGCTC

FMM1X2REF

FMM1X2IN

VCC2

AMMIX2OUT1

AMMIX2OUT2

GNDVCC2

60

59

58

57

56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

41

VREF1

RXIN0AMIF2IN

MPXW

GNDDEM

FMREFDEMC

AMIF2REF

AMIF2BPF

MPXOUT

AFS

VCCSTEREO

MPXIN

MUTETC

MPTC

GNDSTEREO

QUALYOUT

FSWO

VCC1

L

R

GNDVCC1

MIX1 OUT1

TEST1

DEVTC

AMMIX1IN

AMMIX1REF

AMRFAGCOUT

AMPINDR

FMPINDR

FMMIX1IN1

GNDRF

FMMIX1IN2

TV1

TV2

ISSSTATUS

FMAGCTC

VCOB

VCOE

VCCVCO

S1

S2

TEST2

MIX1OUT2

79

80

1

2

3

4

5

6

7

8

9

10

12

13

14

15

16

17

18

19

20

21 22 23 24 25

GNDIF1

IF1AGCIN

AMAGC2TC

75 74 73 727071 69 68 67 66 65

76

77

78

26 27 28 29 30

AMREFDEMC

311132 33 34 35 36

64 63 62 61

37 38 39 40

2.2 Pin description

Table 1. Pin description

Pin No. Pin Name Function

1 MIX1OUT1 Mixer Tank 10.7MHz

2 TEST1 Testing I/O Pin

3 DEVTC Deviation Detector Time Constant

4 AMMIX1IN AM Mixer1 Input

5 AMMIX1REF AM Mixer1 Reference

6 AMRFAGCOUT Output AM RF AGC

7 AMPINDR AM PIN Diode Driver Output

8 FMPINDR FM PIN Diode Driver Output

9 FMMIX1IN1 FM Mixer1 Input1

10 GNDRF RF Ground

11 FMMIX1IN2 FM Mixer1 Input2

FSU

GNDVCO

ADJCH

AMST/MP

XTALG

INLOCK

ISSTC1

ISSTC2

XTALD

SSTOP

SDA

SCL

FSTC

LPOUT

GNDVCC3

VCC3

VREF2

LPAM

LPFM

LPHC

D05AU1618

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Pins description and connection diagrams TDA7540B

Table 1. Pin description (continued)

Pin No. Pin Name Function

12 TV1 Tuning Voltage Preselection1

13 TV2 Tuning Voltage Preselection2

14 ISSSTATUS ISS Filter Status Output

15 S1 Free Programmable Switching Output

16 FMAGCTC FM AGC Time Constant

17 S2 Free Programmable Switching Output

18 VCOB VCO Input Base

19 VCOE VCO Output Emitter

20 VCCVCO VCO Supply

21 GNDVCO VCO Ground

22 FSU Unweighted Fieldstrength Output

23 ADJCH Ident. Adjacent Channel Output

24 AMST/MP AM Stereo Output / Ident. Multipath Output

25 INLOCK PLL Inlock Information Output

26 XTALG Xtal Oscillator to MOS Gate

27 ISSTC1 Time Constant1 ISS Filter Switch

28 ISSTC2 Time Constant2 ISS Filter Switch

29 XTALD Xtal Oscillator to MOS Drain

30 SSTOP Search Stop Output

2

31 SDA I

32 SCL I

33 FSTC S-meter Filtering Capacitor

34 GNDVCC3 VCC3 Ground

35 LPOUT Op Amp Output to PLL Loop Filters

36 VCC3 Supply Tuning Voltage

37 VREF2 Voltage Reference for PLL Op Amp

38 LPAM Op Amp Input to PLL Loop Filters AM

39 LPFM Op Amp Input to PLL Loop Filters FM

40 LPHC High Current PLL Loop Filter Input

41 GNDVCC1 Digital Ground

42 R Stereodecoder Output Right

43 L Stereodecoder Output Left

44 VCC1 Digital Supply

45 FSWO Weighted Fieldstrength Output with programmable DC offset

46 Qualyout Stereodecoder Quality Output

47 GNDSTEREO Strereodecoder Ground

48 MPTC Multipath Time Constant

49 MUTETC Weak Signal Mute Time Constant

C-Bus Data

2

C-Bus Clock

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TDA7540B Pins description and connection diagrams

Table 1. Pin description (continued)

Pin No. Pin Name Function

50 MPXIN Stereodecoder Input

51 VCCSTEREO Stereodecoder Supply

52 AFS Alternative Frequency Search Drive

53 MPX/AFAM MPX Output / AM AF Output

54 AMIF2BPF AM IF2 Bandpass Filter

55 AMIF2REF Reference Voltage AM IF2 Amplifier

56 FMREFDEMC FM Demodulator Reference

57 GNDDEM Ground FM Demodulator

58 MPXW MPX Output without ISS Filtering

59 AMIF2IN Input AM IF2

60 VREF1 Reference 5V

61 GNDVCC2 Analog Ground

62 AMMIX2OUT2 AM Tank 450kHz

63 AMMIX2OUT1 AM Tank 450kHz

64 VCC2 Analog Supply

65 FMMIX2IN FM IF1 Mixer2 Input

66 FMMIX2REF FM IF1 Mixer2 Reference

67 AMRFAGCTC AM RF AGC Time Constant

68 IF1AMP2OUT IF1 Amplifier2 Output

69 AMDETC AM Detector Capacitor

70 AMREFDEMC AM Demodulator Reference

71 IF1AMP2IN IF1 Amplifier2 Input

72 VCCIF1 IF1 Supply

73 IF1AMP1OUT IF1 Amplifier1 Output

74 IF1REF IF1 Amplifier Reference

75 IF1AMP1IN IF1 Amplifier1 Input

76 GNDIF1 IF1 Ground

77 IF1AGCIN IF1 AGC Input

78 AMAGC2TC AM AGC2 Time Constant

79 TEST2 Testing I/O Pin

80 MIX1OUT2 Mixer Tank 10.7MHz

2.3 Thermal data

Table 2. Thermal data

Symbol Parameter Value Unit

R

th(j-amb)

Thermal Resistance Junction to ambient Max.

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55

°C/W

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Electrical specifications TDA7540B

3 Electrical specifications

3.1 Absolute maximum ratings

Table 3. Absolute maximum rating

Symbol Parameter Value Unit

V

T

T

V

V

V

Supply voltage 9.5 V

S

Ambient temperature -40 to 85 °C

amb

Storage temperature -55 to 150 °C

stg

ESD protection (Human Body Model) ±1500 V

ESD

ESD protection (Machine Model) ±150 V

ESD

ESD protection (Change Device Model) ±750 V

ESD

3.2 Electrical characteristics

3.2.1 Globals

Table 4. Electrical characteristics

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 V

1.7 V

1.8 V

1.9 I

1.10 I

1.11 I

1.12 I

1.13 I

1.14 I

1.15 I

(T
f

Xtal

CC1

CC2

CC3

CCVCO

CCMIX1

CCMIX2

CCIF1

CCST

CC1

CC1

CC2

CC2

CC3

CCVCO

CCMIX1

= 25°C, V

amb

CC1

= V

CC2

= V

CC3

= V

CCST

= V

CCVCO

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

= 10.25MHz, in application circuit, unless otherwise specified).

Digital supply voltage 7.7 8.5 9 V

Analog supply voltage 7.7 8.5 9 V

Analog tuning voltage 7.7 8.5 9 V

VCO supply voltage 7.7 8.5 9 V

MIX1 supply voltage 7.7 8.5 9 V

MIX2 supply voltage 7.7 8.5 9 V

IF1 supply voltage 7.7 8.5 9 V

Stereo supply voltage 7.7 8.5 9 V

Supply current FM ON 10 mA

Supply current AM ON 10 mA

Supply current FM ON / VCO:3 90 mA

Supply current AM ON 90 mA

Supply current 4.5 mA

Supply current 8 mA

Supply current FM ON 8 mA

=8.5V,

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TDA7540B Electrical specifications

Table 4. Electrical characteristics (continued)

(T

= 25°C, V

amb

f

= 10.25MHz, in application circuit, unless otherwise specified).

Xtal

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

CC1

= V

CC2

= V

CC3

= V

CCST

= V

CCVCO

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

=8.5V,

1.16 I

1.17 I

1.18 I

1.19 I

CCMIX1

CCMIX2

CCIF1

CCST

Supply current AM ON 7 mA

Supply current AM ON 7 mA

Supply current 5 mA

Supply current 13 mA

2 Reference Voltages

2.1 V

2.2 V

2

3I

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

Internal reference voltage I

= 0mA 5 V

REF1

= 0mA 2.5 V

REF2

Clock frequency 400 kHz

Input low voltage 1 V

IL

Input high voltage 3 5 V

IH

Input current -5 5 µA

IN

Output acknowledge

O

voltage

I

= 1.6mA 0.4 V

O

3.2.2 FM section

Table 5. Electrical characteristics

(T

= 25°C, V

amb

= 98MHz, dev= 40kHz, f

f

RF

otherwise specified).

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

CC1

= V

CC2

= V

MOD

= V

CC3

= 1kHz, f

= V

CCST

CCVCO

= 10.25MHz, in application circuit, unless

Xtal

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

= 8.5V,

4 Wide Band RF AGC

4.1 V

4.2 V

9-11

9-11

Lower threshold start V16 = 2.5V 85 dBµV

Upper threshold start V16 = 2.5V 96 dBµV

5 Narrow Band IF & Keying AGC

5.1 V

5.2 V

5.3 V

Lower threshold start KAGC = off, V

77

Upper threshold start KAGC = off, V

77

Lower threshold start with

77

KAGC

KAGC = max,
V

∆fIF=300KHz

KAGC = max,

5.4 V

Startpoint KAGC

22

V
∆fIF=300KHz
f

5.5 ∆ Control range KAGC ∆V

5.6 R

Input resistance 10 kΩ

IN

= 0mV

9-11

9-11

= 0mV

9-11

9-11

generates FS level at V

IF1

= +0.8V 16 dB

22

= 0mV

RMS,

RMS,

= 0mV

RMS

RMS

22

86 dBµV

98 dBµV

98 dBµV

2.2 V

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Electrical specifications TDA7540B

Table 5. Electrical characteristics (continued)

(T

= 25°C, V

amb

f

= 98MHz, dev= 40kHz, f

RF

CC1

= V

CC2

= V

MOD

= V

CC3

= 1kHz, f

= V

CCST

CCVCO

= 10.25MHz, in application circuit, unless

Xtal

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

= 8.5V,

otherwise specified).

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

5.7 C

Input capacitance 2.5 pF

IN

6 AGC Time Constant Output

V

6.1 V

6.2 V

6.3 I

6.4 I

Max. AGC output voltage V

16

Min. AGC output voltage V

16

Min. AGC charge current V

16

Max. AGC discharge

16

current

V

9-11

9-11

9-11

9-11

= 0mV

= 50mV

= 0mV

= 50mV

RMS

RMS

RMS,V16

RMS,V16

= 2.5V -12.5 µA

= 2.5V 1.25 mA

REF1

+V

BE

0.5 V

V

7 AGC PIN Diode Driver Output

7.1 I

7.2 I

AGC OUT, current min. V

8

AGC OUT, current max. V

8

9-11

9-11

= 0mV

= 50 mV

, V8 = 2.5V 50 µA

RMS

, V8 = 2.5V -20 mA

RMS

8 I/Q Mixer1 (10.7MHz)

8.1 R

8.2 C

8.3 R

8.4 V

8.5 g

OUT

9,11

Input resistance differential 10 kΩ

IN

Input capacitance differential 4 pF

IN

Output resistance differential 100 kΩ

Input dc bias 3.2 V

Conversion

m

transconductance

17 ms

8.6 F Noise figure 400Ω generator resistance 3 dB

8.7 CP

1dB compression point referred to diff. mixer input 100 dBµV

1dB

8.8 IIP3 3rd order intermodulation 122 dBµV

8.9 IQP I/Q phase adjust PH -7 +8 °

8.10 IRR Image rejection ratio ratio wanted/image 30 40 dB

8.11 IRR Image rejection ratio with phase adjust 40 46 dB

9 IF1 Amplifier1 +2 (10.7MHz)

9.1 G2 Gain 6 dB

9.2 G1

9.3 G1

9.4 R

9.5 R

9.6 CP

OUT

Min. gain IFG1 9 dB

min

Max. gain IFG1 18 dB

max

Input resistance 330 W

IN

Output resistance 330 W

1dB compression point referred to 330Ω input 105 dBµV

1dB

9.7 IIP3 3rd order Intermodulation ref. to 330Ω input, 9dB gain 126 dBµV

10 Mixer2 (450kHz)

10.1 R

10.2 V

Input impedance 330 Ω

IN

Max. input voltage 119 dBµV

65

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TDA7540B Electrical specifications

Table 5. Electrical characteristics (continued)

(T

= 25°C, V

amb

f

= 98MHz, dev= 40kHz, f

RF

CC1

= V

CC2

= V

MOD

= V

CC3

= 1kHz, f

= V

CCST

CCVCO

= 10.25MHz, in application circuit, unless

Xtal

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

= 8.5V,

otherwise specified).

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

10.3 V

Limiting sensitivity S/N = 20dB 28 dBµV

65

10.4 G Mixer gain 18 dB

11 Limiter 1 (450kHz)

11.1 G

Limiter

Gain 80 dB

12 Demodulator, Audio Output

12.1 THD

12.2 V

12.3 R

MPX

OUT

12.4 |∆V|

12.5 |∆V|

12.6 S/N

12.7 V

MPXW

Dev.= 75kHz, V
10mV

RMS

MPX output signal Dev.= 75kHz 500 mV

Output impedance 50 Ω

DC offset fine adjust DEM, MENA=1 8.5 mV

min

DC offset fine adjust DEM, MENA=1 264 mV

max

Dev.= 40kHz,V65 =
10mV

RMS

MPXW output signal Dev.= 75kHz 350 mV

=

65

0.1 %

RMS

76 dB

RMS

13 Quality Detection

S-meter, Unweighted Fieldstrength

13.1 V

13.2 V

13.3 V

13.4 ∆V

13.5 ∆V

13.6 ∆V

13.7 R

OUT

Min. input voltage MIX2 30 dBµV

65

Fieldstrength output V65 = 20dBµV0.1V

22

Fieldstrength output V65 = 119dBµV4.9V

22

voltage per decade SMSL = 0 1 V

22

voltage per decade SMSL = 1 1.5 V

22

S-meter offset SL, SMSL=1 -15 15 dB

22

Output impedance 400 Ω

13.8 TK Temp coeff. 0 ppm/K

Adjacent Channel Gain

13.9 G

13.10 G

max

Gain minimum ACG=0 32 dB

min

Gain maximum ACG=1 38 dB

Adjacent Channel Filter

13.11 f

13.12 f

13.13 f

HP

BP

-20dB

-3dB frequency highpass ACF=0 100 kHz

Centre frequency ACF=1 100 kHz

Attenuation 20dB 70 kHz

Adjacent Channel Output

13.14 V

13.15 V

Output voltage low 0.1 V

23

Output voltage high 4.9 V

23

11/75

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DOCUMENT CD00108485 REVISION 1.0 ACTIVE DATE 11-May-2006 page: 12/75

Electrical specifications TDA7540B

Table 5. Electrical characteristics (continued)

(T

= 25°C, V

amb

f

= 98MHz, dev= 40kHz, f

RF

CC1

= V

CC2

= V

MOD

= V

CC3

= 1kHz, f

= V

CCST

CCVCO

= 10.25MHz, in application circuit, unless

Xtal

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

= 8.5V,

otherwise specified).

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

13.16 R

OUT

Output resistance 4 kΩ

Multipath Channel Gain

13.17 G

13.18 G

max

Gain minimum MPG=0 12 dB

min

Gain maximum MPG=1 23 dB

Multipath Bandpass Filter

13.19 f

13.20 f

BP19

BP31

Centre frequency MPF=0 19 kHz

Centre frequency MPF=1 31 kHz

13.21 Q Quality factor 5 8 10

Multipath Output

13.22 V

13.23 V

13.24 R

OUT

Output voltage low 0.1 V

24

Output voltage high 4.9 V

24

Output resistance 2.5 kΩ

14 ISS (intelligent Selectivity System)

Filter 450kHz

14.1 f

centre

Centre frequency f

REF_intern

= 450kHz 450 kHz

14.2 BW 3dB Bandwidth, -3dB ISS80 = 1 80 kHz

14.3 BW 20dB Bandwidth, -20dB ISS80 = 1 150 kHz

14.4 BW 3dB Bandwidth, -3dB ISS80 = 0 120 kHz

14.5 BW 20dB Bandwidth, -20dB ISS80 = 0 250 kHz

14.6 BW 3dB Bandwidth weather band ISS30 = 1 30 kHz

14.7 BW 20dB -20dB weather band ISS30 = 1 80 kHz

Adjacent Channel ISS Filter Threshold

14.8 V

14.9 V

14.10 V

14.11 V

NTH

NTH

WTH

WTH

Internal low threshold ACNTH 0 V

Internal high threshold ACNTH 0.3 V

Internal low threshold ACWTH 0.25 V

Internal high threshold ACWTH 0.95 V

Multipath Threshold

14.12 V

14.13 V

THMP

THMP

Internal low threshold MPTH 0.50 V

Internal high threshold MPTH 1.25 V

ISS Filter Time Constant

14.14 I

14.15 I

14.16 I

27,I28

27,I28

27,I28

Charge current low mid TISS, ISSCTL = 1 -74 µA

Charge current high mid TISS, ISSCTL = 1 -60 µA

Charge current low narrow TISS, ISSCTL = 1 -124 µA

12/75

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DOCUMENT CD00108485 REVISION 1.0 ACTIVE DATE 11-May-2006 page: 13/75

TDA7540B Electrical specifications

Table 5. Electrical characteristics (continued)

(T

= 25°C, V

amb

f

= 98MHz, dev= 40kHz, f

RF

CC1

= V

CC2

= V

MOD

= V

CC3

= 1kHz, f

= V

CCST

CCVCO

= 10.25MHz, in application circuit, unless

Xtal

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

= 8.5V,

otherwise specified).

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

14.17 I

14.18 I

14.19 I

27,I28

27,I28

27,I28

Charge current high
narrow

Discharge current low TISS, ISSCTL = 0 1 µA

Discharge current high TISS, ISSCTL = 0 15 µA

TISS, ISSCTL = 1 -110 µA

14.20 V27,V28Low voltage ISSCTL = 0 0.1 V

14.21 V

27,V28

High voltage ISSCTL = 1 4.9 V

ISS Filter Switch Threshold

14.22 V

27,V28

Threshold ISS on ISSCTL = 0 3 V

14.23 V27,V28Threshold ISS off ISSCTL = 0 1 V

14.24 V

14.25 V

27,V28

27,V28

14.26 I

14.27 I

14.28 I

14.29 I

14.30 DEV

14.31 DEV

14.32 RATIO

14.33 RATIO

Threshold ISS narrow on ISSCTL = 0 4 V

Threshold ISS narrow off ISSCTL = 0 2 V

Charge current low TDEV -25 µA

3

Charge current high TDEV -39 µA

3

Discharge current low TDEV 1 µA

3

Discharge current high TDEV 15 µA

3

Internal low threshold DWTH 30 kHz

WTH

Internal high threshold DWTH 75 kHz

WTH

Referred to threshold DTH 1

min

Referred to threshold DTH 1.5

max

15 Softmute

15.1 V

15.2 V

15.3 a

15.4 a

15.5 a

15.6 V

15.7 a

15.8 I

15.9 I

ANT

ANT

SMmin

SMmax

SMTHISS

ACTH

SMAC

49

49

16 S/N MPX

16.1 (S+N)/N

Upper startpoint SMTH, SMD, SLOPE = 0 10 dBµV

lower startpoint SMTH, SMD, SLOPE = 0 3 dBµV

Min. softmute depth

Max. softmute depth

Mute depth threshold for
ISS filter on

Internal AC mute
threshold

SMD, SLOPE = 0,
SMTH

Upper

SMD, SLOPE = 0,
SMTH

Upper

18 dB

36 dB

SMCTH 0.2 1 2 dB

ACM 60 340 mV

AC mute depth ACMD 4 10 dB

Charge current -47.5 µA

Discharge current 2.5 µA

= 60dBµV,

V

ANT

dev.= 40kHz,LP=15KHz
deemphasis t = 50

µs

66 69 dB

13/75

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DOCUMENT CD00108485 REVISION 1.0 ACTIVE DATE 11-May-2006 page: 14/75

Electrical specifications TDA7540B

3.2.3 AM section

Table 6. Electrical Characteristics

(T

= 25°C, V

amb

= 98MHz, m= 30%, f

f

RF

otherwise specified).

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

17 Global

CC1

= V

CC2

MOD

= V

= V

CC3

CCST

= 400kHz, f

= V

CCVCO

= 10.25MHz, in application circuit, unless

Xtal

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

= 8.5V,

17.1 V

17.2

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

17.4 a

17.5 f

17.6 THD Total Harmonic Distortion

17.7 V

17.8 V

17.9 V

17.10 V

17.11 V

17.12 |I

Usable sensitivity (S+N)/N = 26 dB 25 19 dBµV

ANT_us

∆V

AF

78max

IF2 AGC Range Ref.: V

ANT

IF rejection

IF

Frequency response

AF output level V

53

IF output level V

24

Min. RF AGC threshold

4

Max. RF AGC threshold

Min. IF AGC threshold

71

Max. IF AGC threshold

Min. DAGC threshold

71

Max. DAGC threshold

Ref: V
IF = 10.7MHz

Ref.: V

∆V

AF

V

INRF

m = 0.3
V

INRF

m = 0.3

INRF

INRF

WAGC

WAGC

DAGC

= 60dBµV, 50 52 dB

INRF

= 60dBµV5055 dB

INRF

= 60dBµV,

INRF

70 80 dB

= 60dBµV,

INRF

= -3 dB

= 60dBµV, m = 0 . 8

3.6 kHz

0.5

0.3

= 120 dBµV, m = 0 . 8

1.0

0.3

= 60dBµV 190 mV

= 60dBµ, m=off 190 mV

90

109

90

109

74
96

| AGC2 charge current seek 160 µA

17.13 CCR Charge current ratio seek/seek off 30

%

RMS

RMS

dBµV
dBµV

dBµV
dBµV

dBµV
dBµV

18 AGC Voltage Driver Output

18.1 V

18.2 V

18.3 | I

Max. AGC output voltage 3.5 V

6

Min. AGC output voltage 0.5 V

6

| AGC current 100 µA

6

19 AGC PIN Diode Driver Output

19.1 I

AGC driver current -2 mA

7

20 AM Mixer1 (10.7MHz)

20.1 R

20.2 C

20.3 R

OUT

Input resistance differential 100 kΩ

IN

Input capacitance differential 4 pF

IN

Output impedance differential 100 kΩ

14/75

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DOCUMENT CD00108485 REVISION 1.0 ACTIVE DATE 11-May-2006 page: 15/75

TDA7540B Electrical specifications

Table 6. Electrical Characteristics

(T

= 25°C, V

amb

f

= 98MHz, m= 30%, f

RF

CC1

= V

CC2

MOD

= V

= V

CC3

CCST

= 400kHz, f

= V

CCVCO

= 10.25MHz, in application circuit, unless

Xtal

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

= 8.5V,

otherwise specified).

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

20.4 CP

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

1dB

20.5 IIP3 3rd order intermodulation 132 dB

20.6 F Noise figure 8 dB

20.7 A Gain 26 dB

20.8 C

20.9 C

20.10 C

min

max

1-80

Min. capacitance step IF1T 0.55 pF

Max. capacitance IF1T 8.25 pF

IF1T 2 pF

21 AM Mixer2 (450kHz)

21.1 R

21.2 C

21.3 CP

Input resistance 330 W

71

Input capacitance 2.5 pF

71

1dB compression point referred to diff. mixer input 120 dBµV

1dB

21.4 IIP3 3rd order intermodulation 132 dBµV

21.5 F Noise figure 12 dB

21.6 A Max. gain Mixer2 tank output 34 dB

21.7 ∆A Gain control range 20 dB

21.8 C

21.9 C

21.10 C

min

max

62-63

Min. cap step IF2T 1.6 pF

Max. cap IF2T 24 pF

IF2T 2 pF

22 IF Noise Blanking

µV

22.1 t

22.2 t

22.3 V

22.4 V

22.5 V

22.6 V

22.7 V

bl

bl

th

th

thstep

desth

desth

Min. blanking time 8 µs

Max. blanking time 17 µs

Min internal threshold 0 mV

Max. internal threshold 187.5 mV

Threshold step 12.5 mV

Min. desensitivity threshold 3.2 V

Max. desensitivity threshold 4 V

15/75

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DOCUMENT CD00108485 REVISION 1.0 ACTIVE DATE 11-May-2006 page: 16/75

Electrical specifications TDA7540B

3.2.4 Stereodecoder

Table 7. Electrical characteristics

(T

= 25°C, V

amb

= 500mV

V

MPX

circuit, unless otherwise specified).

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

23 Stereodecoder

= V

CC1

mono, f = 1kHz, deemphasis = 50µs, f

rms

CC2

= V

CC3

= V

CCST

= V

CCVCO

= V

CCMIX1

Xtal

= V

CCMIX2

= 10.25MHz, in application

= V

CCIF1

= 8.5V,

23.1 V

23.2 R

23.3 G

23.4 G

23.5 G

min

max

step

23.6 SVRR

23.7 a Max. channel separation

MPX input level STD Gain = 2,5 dB 0.5 0.93 V

in

Input resistance 100 kΩ

in

Min. Stereodecoder gain 0 dB

Max. Stereodecoder gain 3.75 dB

Stereodecoder gain step
resolution

Supply voltage ripple
rejection

Vripple = 100mV, f = 1kHz 60 dB

V

MPX

= 500mV

rms

stereo

only L/R

1.25 dB

50 dB

23.8 THD Total harmonic distortion 0.02 0.3 %

23.9 (S+N)/N

23.10 V

23.11 R

23.12 V

23.13 V

puafs

puafs

TH1

TH2

Signal plus Noise to Noise
ratio

A-weighted, 19kHz notch 85 dB

Pull up voltage for AFS pin 3.3 V

Pull up resistor for AFS pin 25 kΩ

1. threshold for AFS PIN 2.4 V

2. threshold for AFS PIN 0.8 V

24 Mono/Stereo-switch

24.1 V

24.2 V

24.3 V

24.4 V

PTHST1

PTHST0

PTHMO1

PTHMO0

Pilot threshold voltage for Mono->Stereo, PTH = 1 10 mV

Pilot threshold voltage for Mono->Stereo, PTH = 0 14 mV

Pilot threshold voltage for Stereo->Mono, PTH = 1 8 mV

Pilot threshold voltage for Stereo->Mono, PTH = 0 12 mV

25 19kHz PLL

rms

rms

rms

rms

rms

25.1 f

lock

PLL lock range

Pilot magnitude
20 mV

rms

= 4%

18.9 19.1 kHz

25.2 DP Pilot deviation Pilot frequency 19kHz 4 30 %

26 Deemphasis- and highcut

26.1 t

26.2 t

HC50

HC75

Deemphasis time constant

Deemphasis time constant

DEEMP = 0, DESFT = 1
V

>> V

LEVEL

HCH

DEEMP = 1, DESFT = 1

>> V

V

LEVEL

HCH

50 µs

75 µs

16/75

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DOCUMENT CD00108485 REVISION 1.0 ACTIVE DATE 11-May-2006 page: 17/75

TDA7540B Electrical specifications

Table 7. Electrical characteristics (continued)

(T
V

amb

MPX

= 25°C, V
= 500mV

= V

CC1

mono, f = 1kHz, deemphasis = 50µs, f

rms

CC2

= V

CC3

= V

CCST

= V

CCVCO

= V

CCMIX1

Xtal

= V

CCMIX2

= 10.25MHz, in application

= V

CCIF1

= 8.5V,

circuit, unless otherwise specified).

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

26.3 t

26.4 t

26.5 t

26.6 t

26.7 F

26.8 F

HC25

HC37

HC50

HC75

AMCMin

AMCMin

Deemphasis time constant

Deemphasis time constant

Highcut time constant

Highcut time constant

Min. AM corner frequency

Max. AM corner frequency

DEEMP = 0, DESFT = 0
V

LEVEL

DEEMP = 1, DESFT = 0
V

LEVEL

DEEMP = 0, DESFT = 1
V

LEVEL

DEEMP= 1, DESFT = 1
V

LEVEL

DEEMP = 0, DESFT = 1
AMCF

DEEMP = 0, DESFT = 1
AMCF

27 Stereoblend- and highcut-control

27.1 L

27.2 L

27.3 L

Gmin

Gmax

Gstep

27.4 VSBL

27.5 VSBL

27.6 VSBL

27.7 VHCH

27.8 VHCH

27.9 VHCH

27.10 VHCL

27.11 VHCL

27.12 VHCL

Min. level gain LG 0 dB

Max. level gain LG 4.7 dB

Level gain step resolution LG 0.67 dB

Min. voltage for mono SBC 29 %V

min

Max. voltage for mono SBC 58 %V

max

Step resolution SBC 4.2 %V

step

Min. voltage for no highcut VHCH 42 %V

min

Max. Voltage for no highcut VHCH 66 %V

max

Step resolution VHCH 8 %V

step

Min. voltage for full high cut VHCL, MAXHC = 00 11 %VHCH

min

Max. voltage for full high cut VHCL, MAXHC = 00 33 %VHCH

max

Step resolution VHCL, MAXHC = 00 7.3 %VHCH

step

28 Carrier and harmonic suppression at the output

>> V

>> V

<< V

<< V

HCH

25 µs

37.5 µs

HCH

150 µs

HCL

225 µs

HCL

1.06 kHz

3.18 kHz

REF1

REF1

REF1

REF1

REF1

REF1

28.1 a19 Pilot signal f=19kHz V

pilot

= 50mV

rms

50 dB

28.2 a38 Subcarrier f=38kHz 75 dB

28.3 a57 Subcarrier f=57kHz 62 dB

28.4 a76 Subcarrier f=76kHz 90 dB

29 Intermodulation (Note 1)

29.1 a2 f

29.2 a3 f

=10kHz, f

mod

=13kHz, f

mod

=1kHz 65 dB

spur

=1kHz 75 dB

spur

17/75

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DOCUMENT CD00108485 REVISION 1.0 ACTIVE DATE 11-May-2006 page: 18/75

Electrical specifications TDA7540B

Table 7. Electrical characteristics (continued)

(T
V

amb

MPX

= 25°C, V
= 500mV

= V

CC1

mono, f = 1kHz, deemphasis = 50µs, f

rms

CC2

= V

CC3

= V

CCST

= V

CCVCO

= V

CCMIX1

Xtal

= V

CCMIX2

= 10.25MHz, in application

= V

CCIF1

= 8.5V,

circuit, unless otherwise specified).

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

30 Traffic Radio (Note 2)

30.1 a57 Signal f=57kHz 70 dB

31 SCA - Subsidiary Communications Authorization (Note 3)

31.1 a67 Signal f=67kHz 75 dB

32 ACI - Adjacent Channel Interference (Note 4)

32.1 a114 Signal f=114kHz 95 dB

32.2 a190 Signal f=190kHz 84 dB

33 FM noise blanker

33.1 V

33.2 V

33.3 V

33.4 V

33.5 V

33.6 V

33.7 V

33.8 V

33.9 V

33.10 V

33.11 V

TRMIN

TRMAX

TRSTEP

TRNOISE

TRNOISE

PEAK

PEAK

PEAK

PEAKDEV

PEAKDEV

PEAKFS

Min. trigger threshold

Max. trigger threshold

Trigger threshold step

Min. noise controlled
trigger threshold

Max. noise controlled
trigger threshold

Peak voltage NBRR = 00, V

Peak voltage V

Peak voltage V

Min. deviation dependent
peak voltage

Max. deviation dependent
peak voltage

Min. fieldstrength controlled
peak voltage

Max. fieldstrength

33.12 V

PEAKFS

controlled
peak voltage

33.13 T

33.14 T

33.15 SR

PEAK

Min. blanking time

S

Max. blanking time

S

Noise rectifier charge

0)

0)

0)

0)

V

=0.8V, NBLTH 147 mV

PEAK

0)

V

=0.8V, NBLTH 280 mV

PEAK

V

=1.5V, NBCTH 450 mV

PEAK

V

=1.5V, NBCTH 1200 mV

PEAK

=50mV, f=150kHz 1.9 V

MPX

=200mV, f=150kHz 3.5 V

MPX

V

=500mV, NBDTH = 11

MPX

V

=500mV, NBDTH= 00 2.0 V

MPX

V

=0mV, V

MPX

(fully mono), NBFS = 11

=0mV, V

V

MPX

(fully mono), NBFS = 00

Signal HOLDN in testmode,
NBT

Signal HOLDN in testmode,
NBT

Signal PEAK in testmode,
NBPC=0

19 mV

=0mV 0.8 V

MPX

0.8

(off)

LEVEL

<< V

SBL

0.8

(off)

<< V

LEVEL

SBL

2.0 V

22 µs

38 µs

10 mV/µs

OP

OP

OP

OP

OP

V

OP

OP

V

33.16 SR

PEAK

Noise rectifier charge

Signal PEAK in testmode,
NBPC=1

20 mV/µs

18/75

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DOCUMENT CD00108485 REVISION 1.0 ACTIVE DATE 11-May-2006 page: 19/75

TDA7540B Electrical specifications

Table 7. Electrical characteristics (continued)

(T
V

amb

MPX

= 25°C, V
= 500mV

= V

CC1

mono, f = 1kHz, deemphasis = 50µs, f

rms

CC2

= V

CC3

= V

CCST

= V

CCVCO

= V

CCMIX1

Xtal

= V

CCMIX2

= 10.25MHz, in application

= V

CCIF1

= 8.5V,

circuit, unless otherwise specified).

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

33.17 V

33.18 V

33.19 V

33.20 V

33.21 V

RECTADJ

RECTADJ

RECTADJ

RECTADJ

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

33.22 V

ADJMP

by strong multipath
influence

Noise rectifier adjustment

33.23 V

ADJMP

by multipath and strong
multipath influence

33.24 G

AMdelay

AM delay filter attenuation f = 2.2kHz 2 dB

34 Multipath Detector

Signal PEAK in testmode,
NBRR=00, NBSMP=0,
MPPC=0

Signal PEAK in testmode,
NBRR=01, NBSMP=0,
MPPC=0

Signal PEAK in testmode,
NBRR=10, NBSMP=0,
MPPC=0

Signal PEAK in testmode,
NBRR=11, NBSMP=0,
MPPC=0

Signal PEAK in testmode,

=1V, NBSMP=0,

V

MPTC

MPPC=1

Signal PEAK in testmode,
V

=1V,, NBSMP=1,

MPTC

MPPC=0

Signal PEAK in testmode,
V

=1V,, NBSMP=1,

MPTC

MPPC=1

0.3 V/ms

0.8 V/ms

1.3 V/ms

2.0 V/ms

TBD V/ms

TBD V/ms

TBD V/ms

34.1 f

34.2 G

34.3 G

34.4 G

34.5 G

34.6 I

34.7 I

34.8 I

CMP

BPMP

BPMP

RECTMP

RECTMP

CHMP

CHMP

DISMP

Center frequency of
multipath-bandpass

Min. band pass gain MPBPG 6 dB

Max. band pass gain MPBPG 12 dB

Min. rectifier gain MPRG 0 dB

Max. rectifier gain MPRG 7.6 dB

Rectifier charge current MPCC = 0 0.8 µA

Rectifier charge current MPCC = 1 0.4 µA

Rectifier discharge current 1 mA

stereo decoder locked on
pilot tone

19 kHz

35 Quality detector

35.1 a Min. MP influence factor QDC 0.6

35.2 a Max. MP

influence factor QDC 1.05

35.3 A Min. noise influence factor QNG 6 dB

35.4 A Max. noise influence factor QNG 15 dB

19/75

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DOCUMENT CD00108485 REVISION 1.0 ACTIVE DATE 11-May-2006 page: 20/75

Electrical specifications TDA7540B

1. Intermodulation Suppression

a

2 = VO(signal,@1KHz) / VO(spurious, @1KHz) ; fs = (2x10KHz) - 19KHz

a

3 = VO(signal,@1KHz) / VO(spurious, @1KHz) ; fs = (3x13KHz) - 38KHz

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

2. Traffic Radio (V.F.) Suppression

57(V,W,F) = VO(signal,@1KHz) / VO(spurious, @1KHz+/-23KHz)

a

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

3. SCA ( Subsidiary Communications Authorization )

67 = VO(signal,@1KHz) / VO(spurious, @9KHz) ; fs = (2x38KHz) - 67KHz

a

measured with: 81% mono signal; 9% pilot signal; fm=1kHz; 10%SCA – sub carrier ( fS =
67kHz, unmodulated ).

4. ACI ( Adjacent Channel Interference )

a

114 = VO(signal,@1KHz) / VO(spurious, @4KHz) ; fs = 110KHz - (3x38KHz)

a

190 = VO(signal,@1KHz) / VO(spurious, @4KHz) ; fs = 186KHz - (5x38KHz)

measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal ( fS =
110kHz or 186kHz, unmodulated).

0

) All thresholds are measured inTestmode at the quality output. The thresholds are
calculated by
V

- V

NBTH

V

PEAK

PEAK

is adjusted by applying a 150kHz sinewave at MPXIN.

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TDA7540B Electrical specifications

Figure 3. Trigger threshold vs. V

VTH

Min. Trig. T hreshold

200 mV

8 STEPS

147 mV

0.8 V

PEAK

Noise Controlled Tr ig. Threshold

Figure 4. Deviation controlled trigger adjustment

V

PEAK

[V ]

OP

1200 mV (00)

950 mV (01)

700 mV (10)

450 mV (11)

V

Peak1.5 V

2.0

1.5

1.0

0.8

20 32.5 45 75

Figure 5. Field strength controlled trigger adjustment

V

PEAK

MONO STEREO

≈

3V

2.0V (00 )

1.6V ( 01)

NOIS E

ATC _SB OF F (11)

1.4V ( 10)

00

01

10

11

Detector off

DEVIATION [KHz]

0.8V

noisy sig nal go od signal

E'

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Electrical specifications TDA7540B

3.2.5 PLL section

Table 8. Electrical characteristics

(T

= 25°C, V

amb

= 98MHz, dev. = 40kHz, f

f

RF

otherwise specified).

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

36 Output of Tuning Voltages (TV1,TV2)

CC1

= V

CC2

= V

MOD

= V

CC3

= 1kHz, f

CCST

= V

CCVCO

= 10.25MHz, in application circuit, unless

Xtal

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

= 8.5V,

36.1 V

36.2 R

36.3 R

OUT

OUT

OUT

Output voltage TVO 0.5 V

-0.5 V

CC3

Output impedance TVMODE=0 40 kΩ

Output impedance TVMODE=1 20 kΩ

37 Xtal Reference Oscillator

37.1 f

37.2 C

37.3 C

LO

Step

max

37.4 ∆f/f Deviation versus VCC2

Reference frequency C

= 15pF 10.25 MHz

Load

Min. cap step XTAL 0.75 pF

Max. cap XTAL 23.25 pF

∆V

= 1V 1.5 ppm/V

CC2

37.5 ∆f/f Deviation versus temp -40°C < T < +85°C 0.2 ppm/K

38 Loop Filter Input/Output

38.1 -I

38.2 I

38.3 V

38.4 V

38.5 I

38.6 I

IN

IN

OL

OH

OUT

OUT

Input leakage current VIN = GND, PD

= VREF1

V

Input leakage current

Output voltage Low I

Output voltage High I

Output current, sink V

Output current, source V

IN

= Tristate

PD

OUT

= -0.2mA 0.05 0.5 V

OUT

= 0.2mA

OUT

= 1V to V

OUT

= 1V to V

OUT

= Tristate -0.1 0.1 µA

OUT

-0.1 0.1 µA

-

V

V

CC3

0.5

-1V 10 mA

CC3

-1V -10 mA

CC3

CC3

0.05

­V

39 Voltage Controlled Oscillator (VCO)

39.1 f

39.2 f

VCOmin

VCOmax

39.3 C/N Carrier to Noise

Minimum VCO frequency 50 MHz

Maximum VCO frequency 260 MHz

= 200MHz, ∆f=1KHz,

f

VCO

B=1Hz, closed loop

80 dBc

40 SSTOP, INLOCK, ISSSTATUS Outputs (Open Collector)

40.1 V Output voltage low I = -200

µA0.20.5V

40.2 V Output voltage high 5 V

40.3 -I Output leakage current V = 5V -0.1 0.1 µA

40.4 I Output current, sink V = 0.5V-5V 1 mA

41 Switching Outputs S1, S2 (Open Collector SMODE=1)

41.1 V Output voltage low I = -5mA 0.2 0.5 V

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TDA7540B Electrical specifications

Table 8. Electrical characteristics (continued)

(T

= 25°C, V

amb

f

= 98MHz, dev. = 40kHz, f

RF

CC1

= V

CC2

= V

MOD

= V

CC3

= 1kHz, f

CCST

= V

CCVCO

= 10.25MHz, in application circuit, unless

Xtal

= V

CCMIX1

= V

CCMIX2

= V

CCIF1

= 8.5V,

otherwise specified).

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

41.2 V Output voltage high V

CC1

V

41.3 -I Output leakage current V = 5V -3 3 µA

41.4 I Output current, sink V = 0.5V-V

CC

5mA

42 Switching Outputs S1, S2 (Open Emitter SMODE=0)

42.1 V Output voltage low I = 0µA0V

V

-

42.2 V Output voltage high I = 1mA

CC1

1

V

42.3 -I Output leakage current -0.1 0.1 µA

42.4 I Output current, sink V = 5V 5 mA

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Functional description TDA7540B

4 Functional description

4.1 FM section

4.1.1 Mixer1, AGC and 1.IF

FM quadrature I/Q-mixer converts FM RF to IF1 of 10.7MHz. The mixer provides inherent
image rejection and wide dynamic range with low noise and large input signal performance.
The mixer1 tank can be adjusted by software (IF1T). 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, 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,KAGC). The output signal is a controlled current for pin diode attenuator.

A 10.7MHz programmable amplifier (IFG1) correct the IF ceramic insertion loss and the
costumer level plan application.

4.1.2 Mixer2, limiter and demodulator

In this 2nd mixer stage the first 10.7MHz IF is converted into the second 450kHz IF. A multi­stage limiter generates signals for the complete integrated demodulator including spike
cancellation (DNB). MPX output DC offset versus noise DC level is correctable by software
(DEM), if tuner softmute is activated.

4.1.3 Quality detection and ISS

Fieldstrength

Parallel to mixer2 input a 10.7MHz limiter generates a signal for digital IF counter and a
fieldstrength output signal. This internal unweighted fieldstrength is used for keying AGC,
adjacent channel and multipath detection and is available at PIN22 (FSU) after +6dB buffer
stage. It is possible to combinate the IF counter result with this FSU via programmable
comparator (SSTH). The behaviour of FSU signal can be corrected for DC offset (SL) and
slope (SMSL). The generated unweighted fieldstrength is externally filtered and used for
softmute function and generation of ISS filter switching signal for weak input level (sm).

Adjacent channel detector

The input of the adjacent channel detector is AC coupled from internal unweighted
fieldstrength. A programmable highpass or bandpass (ACF) and amplifier (ACG) as well as
rectifier determines the influences. This voltage is compared with adjustable comparator1
thresholds (ACWTH, ACNTH). The output signal of this comparator generates a DC level at
PIN27 by programmable time constant. Time control (TISS) for a present adjacent channel

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TDA7540B Functional description

is made by charge and discharge current after comparator1 in an external capacitance. The
charge current is fixed and the discharge current is controlled by I

2

C Bus. This level
produces digital signals (ac, ac+) in an additional comparator4. The adjacent channel
information is available as analog output signal after rectifier and +8dB output buffer.

Multipath detector

The input of the multipath detector is AC coupled from internal unweighted fieldstrength. A
programmable bandpass (MPF) and amplifier (MPG) as well as rectifier determines the
influences. This voltage is compared with an adjustable comparator2 thresholds (MPTH).
The output signal of this comparator2 is used for the "Milano" effect. In this case the
adjacent channel detection is switched off. The "Milano" effect is selectable by I

2

C Bus
(MPOFF). The multipath information is available as analog output signal after rectifier and
+8dB output buffer.

450kHz IF narrow bandpass filter (ISS filter)

The device gets an additional 450KHz IF narrow bandpass filter for suppression of noise
and adjacent channel signal influences. This narrow filter has three switchable bandwidthes,
narrow range of 80kHz, mid range of 120kHz and 30KHz for weather band information.
Without ISS filter the IF bandwidth (wide range) is defined only by ceramic filter chain. The
filter is located between mixer2 and 450kHz limiter stage. The centre frequency is matched
to the demodulator center frequency.

Deviation detector

In order to avoid distortion in audio output signal the narrow ISS filter is switched OFF for
present overdeviation. Hence the demodulator output signal is detected. A lowpass filtering
and peak rectifier generates a signal that is defined by software controlled current (TDEV) in
an external capacitance.

This value is compared with a programmable comparator3 thresholds (DWTH, DTH) and
generates two digital signals (dev, dev+). For weak signal condition deviation threshold is
dependent on FSWO.

ISS switch logic

All digital signals coming from adjacent channel detector, deviation detector and softmute
are acting via switching matrix on ISS filter switch. The IF bandpass switch mode is
controlled by software (ISSON, ISS30, ISS80, CTLOFF). The switch ON of the IF bandpass
is also available by external manipulation of voltage at PIN27. Two application modes are
available (APPM).

The conditions are described in table 51.

4.1.4 Soft mute control

The filtered fieldstrength (FSWO) signal is the reference for mute control. The startpoint and
mute depth are programmable (SMTH, SMD) in a wide range. The time constant is defined
by external capacitance. Additional adjacent channel mute function is supported. A
highpass filter with -3dB threshold frequency of 100kHz, amplifier and peak rectifier
generates an adjacent noise signal from MPX output with the same time constant for
softmute. This value is compared with comparator5 thresholds (ACM). For present strong
adjacent channel the MPX signal is additional attenuated (ACMD).

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Functional description TDA7540B

4.2 AM section

The up/down conversion is combined with gain control circuit sensing three input signals,
narrow band information at PIN 54, upconversion signal (IF2AGC) at PIN 71and wide band
information (RFAGC) at PIN 4.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 100k resistor and external capacitor at
PIN 67. The intervention points for AGC (DAGC,WAGC) are programmable by software.

In order to avoid a misbehaviour of AGC intervention point it is important to know that the
DAGC threshold has to be lower than WAGC threshold !

The oscillator frequency for upconversion-mixer1 is generated by dividing the VCO
frequency after VCO divider (VCOD) and AM predivider(AMD).

Two 10,7MHz ceramic filters before mixer2 input increases 900KHz attenuation.In mixer2
the IF1 is down converted into the IF2 450kHz. After filtering by ceramic filter a 450kHz
amplifier is included with an additional gain control of IF2 below DAGC threshold. Time
constant is defined by capacitance at PIN 78.

Mixer1 and mixer2 tanks are software controlled adjustable (IF1T, IF2T).

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

A separate output is available for AMIF stereo (AMST).

AM IF noise blanker

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

The 10,7MHz AM IF signal generates before 10,7 MHz ceramic filter via limitation an
unweighted fieldstrenght signal including slope of noise spike. The comparison of these
detected slope between fast and slow rectifier ignores audio modulation whereby the
threshold of slow 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 450KHz AM mixer2. Additionally this funtionality is controlled by narrow AM
fieldstrenght (AINBD).

4.3 Stereodecoder

4.3.1 Decoder

The stereo decoder-part of the TDA7540 (see Fig. 14) contains all functions necessary to
demodulate the MPX-signal like pilot tone-dependent MONO/STEREO-switching as well as
"stereoblend" and "highcut". Adaptations like programmable input gain, roll-off
compensation, selectable deemphasis time constant and a programmable field strength
input allow easy adaption to different applications.

The 4.th order input filter has a corner frequency of 80kHz and is used to attenuate spikes
and noise and acts as an anti-aliasing filter for the following switch capacitor filters.

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TDA7540B Functional description

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 TDA7540 offers an I2C-bus programmable roll-off adjustment, which is able to
compensate the low pass behavior of the tuner section. Within the compensation range an
adjustment to obtain at least 40dB channel separation is possible. The bits for this
adjustment are located together with the level gain adjustment in one byte. This gives the
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.

Deemphasis and Highcut

The deemphasis low pass allows to choose between a time constant of 50µs/ 75µs
(DEEMP) and 25µs/37.5µs (DESFT). The highcut control range will be in both cases τ
2xτ

. Inside the highcut control range (between VHCH and VHCL) the LEVEL signal is

Deemp

converted into a 5-bit word, which controls the low pass time constant between

τ

Deemp

...3xτ

. Thereby the resolution will remain always 5 bits independently of the

Deemp

absolute voltage range between the VHCH- and VHCL-values.

The highcut function can be switched off by I

2

C-bus .

HC

=

In AM mode (AMON = 1) the bits DEEMP and DESFT together with the AM corner
frequency bits (AMCF1...5) can be used as programmable AM frequency response. The
maximum corner frequency is defined by τ

, the minimum is defined by 3xτ

Deemp

Deemp

19kHz PLL and pilot tone detector

The PLL has the task to lock on the 19kHz 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

V

. Two different thresholds are available.

PTHST

By reading the status byte of the TDA7540 via I2C-bus the detector output can be checked.

Field Strength Control

The field strength input is used to control the highcut- and the stereoblend-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 (pin22). Appling a capacitor at
FSTC (pin33) a desired time constant can by reached together with the internal resistor of
10k between FSU pin and FSTC pin.

In addition to that the LEVEL signal is low pass filtered internally in order to suppress
undesired high frequency modulation on the highcut- and stereoblend-function . The filter is
a combination of a 1.st-order RC-low pass at 53kHz (working as anti-aliasing filter) and a

1.st-order switched capacitor low pass at 2.2kHz. The second stage is a programmable gain
stage to adapt the LEVEL signal internally . The gain is widely programmable in 8 steps
from 0dB to 4,7dB (step=0.67dB). These 3bits are located together with the Roll-Off bits in
the "Stereo decoder 8"-byte to simplify a possible adaptation during the production of the
car radio.

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Functional description TDA7540B

Stereoblend control

The stereoblend 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

V

in 4% steps (see fig.6).

REF1

To adjust the external LEVEL-voltage to the internal range two values must be defined: the
LEVEL gain

L

and VSBL. To adjust the voltage where the full channel separation is reached

G

(VST) the LEVEL gain
the gain:

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

Figure 6. Relation between internal and external level-voltagees and setup of stereoblend

V

. The lower limit can be programmed between 29 and 58% of

REF1

L

has to be defined. The following equation can be used to estimate

G

L

G

= V

/FSU@full stereo

REF1

The stereo blend function can be switched ON/OFF using bit Addr25<d2>. Please note that
in AM it must be switched in forced mono!

Highcut control

The highcut control set-up is similar to the stereoblend control set-up: the starting point
VHCH can be set with 2 bits to be 42, 50, 58 or 66% of

whereas the range can be set

VREF1

to be 11, 18.3, 25.7 or 33% of VHCH (see fig. 7).

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L

ass

t

imeconstan

t

V

V

ieldstrengt

h

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TDA7540B Functional description

Figure 7. Highcut characteristics

owp

3

•
D eem p

D eem p

HCL

HC HF

4.3.2 Functional description of the noise blanker

In the automotive environment spikes produced by the ignition or for example 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
blanker is given in fig.15.

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.

Trigg er pa th

The incoming MPX signal is high pass filtered, amplified and rectified. This second order
high pass filter has a corner-frequency of 140kHz. The rectified signal, RECT, is low pass
filtered to generate a signal called PEAK. Also noise with a frequency 140kHz increases the
PEAK voltage. The resulting voltage can be adjusted by use of the noise rectifier discharge
current. The PEAK voltage is fed to a threshold generator, which adds to the PEAK-voltage
a DC-dependent threshold VTH. Both signals, RECT and PEAK+VTH are fed to a
comparator, which triggers a re-triggerable monoflop. The monoflop's output activates the
sample-and-hold circuits in the signal path for the selected duration.

µs and 38µs (programmable). The block diagram of the noise

Automatic noise controlled threshold adjustment (see Figure 3)

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

1. the low threshold in 8 steps (NBLTH)

2. and the noise adjusted threshold in 4 steps (NBCTH).

The low threshold is active in combination with a good MPX signal without any noise; the
PEAK voltage is less than 1V. The sensitivity in this operation is high.

If the MPX signal is noisy (low fieldstrength) the PEAK voltage increases due to the higher
noise, which is also rectified. With increasing of the PEAK voltage the trigger threshold
increases, too. This particular gain is programmable in 4 steps (NBCTH).

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Functional description TDA7540B

Automatic threshold control by the stereoblend voltage (see Figure 5)

Besides the noise controlled threshold adjustment there is an additional possibility for
influencing the noise blanker trigger threshold using the bits NBFS. This influence depends
on the stereoblend 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 a opportunity to control the PEAK voltage by the
stereo blend function it is implemented.

Over deviation detector (see Figure 4)

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. Offset and gain of this circuit are programmable in 3
steps (NBDTH) of the stereo decoder-byte (the first step turns off the detector).

Multipath-level

To react on high repetitive spikes caused by a Multipath-situation, the discharge-time of the
PEAK voltage can be decreased depending on the voltage-level at Pin MPout. There are
two ways to do this. One way is to switch on the linear influence of the Multipath-Level on the
PEAK-signal . In this case the discharge slew rate is 1V/ms

(a)

. The second possibility is to

activate a function, which switches to the 18k discharge if the Multipath-Level is below 2.5V.

AM mode of noise blanker

The TDA7540 offers an AM audio noise blanker too.

If the AM noise blanker is used the AM audio delay filter must be switched on. It is not
recommented to use the AM noise blanker without to use the AMIF noiseblanker inside the
tuner.

Together with the IF AM moise blanker, this audio noise blanking can work in two different
modes.

Mode 1 uses the same threshold controls like in FM mode. The detector uses in AM mode
the audio input for spike detection. A combination of programmable gain stage and low pass
filtering forms an envelope detector wich drives the noise blanker input via 10/20KHz,
1st/2nd order high pass filter.

In mode 2 only a fixed noise blanker threshold is used.

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 (640µs -1,2ms)

4.3.3 Functional description of the multipath-detector

Using the internal Multipath-Detector the audible effects of a multipath condition can be
minimized. A multipath-condition is detected by rectifying the 19kHz spectrum in the
fieldstrength signal. An external capacitor is used to define the attack- and decay-times (see

a. The slew rate is measured with RDischarge=infinite and VMPout=2.5V

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TDA7540B Functional description

block diagram, fig. 16). The MP_OUT-pin is used as detector-output connected to a
capacitor of about 47nF. Using this configuration an external adaptation to the user's
requirement is possible without affecting the "normal" fieldstrength input (LEVEL) for the
stereo decoder.

To keep the old value of the Multipath Detector during an AF-jump, the MP-Hold switch can
disconnect the external capacitor. This switch is controlled directly by the AFS-Pin.

Selecting MPION the channel separation is automatically reduced during a multipath
condition according to the voltage appearing at the MP_OUT-pin.

Programming

To obtain a good multipath performance an adaptation is necessary. Therefore the gain of
the first 19kHz-bandpass is programmable in two steps (MPG), the gain of the second
19kHz-bandpass is programmable in four steps (MPBPG) and the rectifier gain is
programmable in four steps(MPRG). Please note that the frequency of the first multipath
bandpass (MPF) must be set to 19kHz! 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 TDA7540 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:

V

= 0.8b (V

Qual

-0.8 V)+ a (V

Noise

The noise-signal is the PEAK-signal without additional influences (see noise blanker
description). The factor 'a' can be programmed from 0.6 to 1.05(QDC) and the factor b can
be programmed from 6dB to 15dB ( QNG). The output is a low impedance output 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

The TDA7540 is supplied with several functionality to support AF-checks using the stereo
decoder. The additional pin (AFS) is implemented in order to speed up the stereo decoder
AF-functions compared to IIC controlling.

The block diagramm of AFS function is shown in Figure 17.

In order to separate the different functions of the AFS pin, two different logic thresholds are
implemented. Below the higher threshold voltage (2.4V) only the multipath-detector is
switched into small time constant (internal logical signal MPfast).

Below the lower threshold voltage (0.8V) the full AFS function is activated. The MPXIN pin is
switched into high impedance mode (internal signal AFSMute), which avoids any clicks
during the jump condition. If the stereo decoder is not muted, it is possible at the same time
to evaluate the noise- and multipath-content of the alternate frequency using the Quality
detector output.

REF1-VMpout

).

Furthermore the AFS pin does also freeze the condition of pilot locking and magnitude
(internal signal PDhold). The Pdhold signal is defined by V

th1

or V

, dependent on the

th2

PDH signal.

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Functional description TDA7540B

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 the radio tuning system. Only
one VCO is required to build a complete PLL system for FM world tuning and AM
upconversion (see Figure 9). For auto search stop operation an IF counter system is
available.

The PLL counter works in a two stages configuration. The first stage is a swallow counter
with a two modulus (32/33) precounter. The second stage is an 11-bit programmable
counter.

The circuit receives the scaling factors for the programmable counters and the values of the
reference frequencies via an I

2

C-Bus interface.The reference frequency is generated by an
adjustable internal (XTAL) oscillator followed by the reference divider. The main reference
and step-frequencies are free selectable (RC, PC).

Output signals of the phase detector are switching the programmable current sources. The
loop filter integrates their currents to a DC voltage.

The values of the current sources are programmable by 6 bits also received via the I

2

C Bus

(A, B, CURRH, LPF).

To minimize the noise induced by the digital part of the system, a special guard
configuration is implemented.

The loop gain can be set for different conditions by setting the current values of the
chargepump generator.

Frequency generation for phase comparison

The RF signals applies a two modulus counter (32/33) pre-scaler, which is controlled by a 5­bit A-divider. The 5-bit register (PC0 to PC4) controls this divider. In parallel the output of the
prescaler connects to an 11-bit B-divider. The 11-bit PC register (PC5 to PC15) controls this
divider

Dividing range behind VCO divider:

f

= [33 x A + (B + 1 - A) x 32] x f

VCOdiv

f

= (32 x B + A + 32) x f

VCOdiv

REF

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

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 generators signed pulses of current. The phase error signal decides the
duration and polarity of those pulses. The current absolute values are programmable by A
register for high current and B register for low current.

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TDA7540B Functional description

Inlock detector

Switching the chargepump in low current mode can be done either via software or
automatically by the inlock detector, by setting bit LDENA to "1".

After reaching a phase difference about lower than 40nsec the chargepump is forced in low
current mode. A new PLL divider alternation by I
high current mode.

Low noise CMOS op-amp

An internal voltage divider at pin VREF2 connects the positive input of the low noise op­amp. 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 three input pins, to increase the flexibility in application. This feature allows two
separate active filters for different applications.

While the high current mode is activated LPHC output is switched on.

4.4.2 IF counter block

The aim of IF counter is to measure the intermediate frequency of the tuner for AM and FM
mode. The input signal for FM and AM upconversion is the same 10.7MHz IF level after
limiter. AM 450KHz signal is coming from narrow filtered IF2 before demodulation. A switch
controlled by IF counter mode (IFCM) is choosing the input signal for IF counter.

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

The IF-counter mode

2

C-Bus will switch the chargepump in the

The IF counter works in 3 modes controlled by IFCM register.

Sampling timer

A sampling timer generates the gate signal for the main counter. The basically sampling
time are in FM mode 6.25kHz (t

=160µs) and in AM mode 1kHz (t

TIM

=1ms). This is

TIM

followed by an asynchronous divider to generate several sampling times.

Intermediate frequency main counter

This counter is a 11 - 21-bit synchronous autoreload down counter. Five bits (CF) are
programmable to have the possibility for an adjust to the centre frequency of the IF-filter.
The counter length is automatic adjusted to the chosen sampling time and the counter mode
(FM, AM-UPC, AM).

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

SamplexfIF

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 from 0h to 1FFFFFh.

).

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Functional description TDA7540B

This is detected by a control logic and an external search stop output is changing from LOW
to HIGH. The frequency range inside which a successful count result is adjustable by the
EW bits.

t

= (CF + 1696+1) / fIFFM mode

CNT

t

= (CF + 10688+1) / fIFAM up conversion mode

CNT

t

= (CF + 488+1) / f

CNT

IF

AM mode

Counter result succeeded:
t

≥ t
≤ t

CNT

CNT

- t
+ t

ERR

ERR

TIM

t

TIM

Counter result failed:
t

> t

TIM

t

< t

TIM

t

= IF timer cycle time (sampling time)

TIM

t

CNT

t

ERR

+ t

CNT

CNT

- t

ERR

ERR

= IF counter cycle time

= discrimination window (controlled by the EW registers)

The IF counter is only started by inlock information from the PLL part. It is enabled by
software (IFENA).

Adjustment of the measurement sequence time

The precision of the measurements is adjustable by controlling the discrimination window.
This is adjustable by programming the control registers EW.

The measurement time per cycle is adjustable by setting the registers IFS.

Adjust of the Frequency Value

The center frequency of the discrimination window is adjustable by the control registers CF.

4.5 I2C-Bus interface

The TDA7540 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.

4.5.1 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.

4.5.2 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.

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TDA7540B Functional description

4.5.3 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.

4.5.4 Acknowledge

Indicates a successful data transfer. The transmitter will release the bus after sending 8 bits
of data. During the 9th clock cycle the receiver will pull the SDA line to LOW level to indicate
it receive the eight bits of data.

4.5.5 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.

4.5.6 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 TDA7540 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 59 defines the state of this address bit. So up to two devices
could be connected on the same bus. When PIN 59 is connected to VCC2 and a resistor at
PIN 55 versus ground of about 5,6k Ohm the address bit “1” is selected. In this case the AM
part doesn’t work. Otherwise the address bit “0” is selected (FM and AM is working).
Therefor 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 TDA7540 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
TDA7540 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.

4.5.7 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 64 internal addresses.

Upon receipt of the word address the TDA7540 slave device will respond with an
"acknowledge". At this time, all the following words transmitted to the TDA7540 will be
considered as Data. The internal address will be automatically incremented up to hex40 in

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Functional description TDA7540B

page mode. Than again subaddresse hex60 has to be transmitted for following registers
above 32.

After each word receipt the TDA7540 will answer with an "acknowledge".

4.5.8 Read operation

If the master sends a slave address word with the R/W bit set to "1", the TDA7540 will transit
one 8-bit data word. This data word includes the following informations:

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

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

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)

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TDA7540B Software specification

5 Software specification

The interface protocol comprises:

– start condition (S)

– chip address byte

– subaddress byte

– sequence of data (N bytes + Acknowledge)

– stop condition (P)

The pagermode is only working up to byte 31. After byte 31 it is need to send again the chip
address followed by the subaddress 32 and the databytes starting from 32 up to 39!

5.1 Address organization

Table 9. Address organization

FunctionAddr76543210

CHARGEPUMP 0 FMSEEK CURRH B1 B0 A3 A2 A1 A0

PLL COUNTER

TV1 3 TV1O7 TV1O6 TV1O5 TV1O4 TV1O3 TV1O2 TV1O1 TV1O0

TV2 4 TV2O7 TV2O6 TV2O5 TV2O4 TV2O3 TV2O2 TV2O1 TV2O0

IFC CTRL 1 5 LDENA CASF IFCM1 IFCM0 IFENA IFS2 IFS1 IFS0

IFC CTRL 2 6 EW2 EW1 EW0 CF4 CF3 CF2 CF1 CF0

AM CTL 7 LM TVMODE TV2WB TV1WB AMD1 AMD0 AMST AMSEEK

QUALITYISS 8 TISS2 TISS1 TISS0 --- ISS30 ISS80 ISSON CTLOFF

QUALITY AC 9 ACNTH1 ACNTH0 ACWTH2 ACWTH1 ACWTH0 ACG ACF ---

QUALITY MP 10 MPAC APPM2 APPM1 MPTH1 MPTH0 MPG MPF MPOFF

QUALITYDEV 11 BWCTL DTH1 DTH0 DWTH1 DWTH0 TDEV2 TDEV1 TDEV0

1 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0

2 PC15 PC14 PC13 PC12 PC11 PC10 PC9 PC8

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Software specification TDA7540B

Table 9. Address organization (continued)

FunctionAddr76543210

MUTE1 12 MENA SMD3 SMD2 SMD1 SMD0 SMTH2 SMTH1 SMTH0

MUTE2 13 F100K ACM3 ACM2 ACM1 ACM0 ACMD1 ACMD0 SMCTH

VCO/PLLREF 14 LPF AMON RC2 RC1 RC0 VCOD2 VCOD1 VCOD0

FMAGC 15 RFKAGC KAGC2 KAGC1 KAGC0 IFAGC1 IFAGC0 RFAGC1 RFAGC0

AMAGC 16 DAGC3 DAGC2 DAGC1 DAGC0 WAGC3 WAGC2 WAGC1 WAGC0

DEM ADJ 17 DNB1 DNB0 DEM5 DEM4 DEM3 DEM2 DEM1 DEM0

LEVEL 18 ODSW ODCUR SMSL SL4 SL3 SL2 SL1 SL0

IF1/XTAL 19 XTAL4 XTAL3 XTAL2 XTAL1 XTAL0 IFG11 IFG10 XTLIM

TANK ADJ 20 IF1T3 IF1T2 IF1T1 IF1T0 IF2T3 IF2T2 IF2T1 IF2T0

I/Q ADJ 21 SMO1 SMO0 --- --- PH3 PH2 PH1 PH0

AMIFNB 22 AINT1 AINT0 AINBD1 AINBD0 AINBT3 AINBT2 AINBT1 AINBT0

SCTRL 23 SSTH3 SSTH2 SSTH1 SSTH0 S2MODE S2 S1MODE S1

STD1 24 STVCO1 STVCO0 NBT1 NBT0 SI TFCKL NBFT TSMA

STD2 25 STING1 STING0 DEEMP PTH NBPC MS STDON STDM

STD3 26 NBDTH1 NBDTH0 NBON NBCTH1 NBCTH0 NBLTH2 NBLTH1 NBLTH0

STD4 27 NBSMP VHCL1 VHCL0 VHCH1 VHCH0 MAXHC1 MAXHC0 HCON

STD5 28 MPPC QDC1 QDC0 NBFS1 NBFS0 SBC2 SBC1 SBC0

STD6 29 MPRG1 MPRG0 MPCC MPION MPBPG1 MPBPG0 NBRR1 NBRR0

STD7 30 AMAF LG2 LG1 LG0 ROC3 ROC2 ROC1 ROC0

STD8 31 AMNBD AMNBFO AMNBHP PDH AFSM AFSON QNG1 QNG0

STD9 32 AMCF4 AMCF3 AMCF2 AMCF1 AMCF0 DESFT --- ---

TESTTU1 33 OUT20 ISSIN TOUT TIN1 CLKSEP TEST3 TEST2 TEST1

TESTTU2 34 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 OUT0

TESTTU3 35 --- TINACM TINMP TINAC OUT11 OUT10 OUT9 OUT8

TESTTU4 36 OUT19 OUT18 OUT17 OUT16 OUT15 OUT14 OUT13 OUT12

TESTTU5 37 TIN2 OUT27 OUT26 OUT25 OUT24 OUT23 OUT22 OUT21

TESTSTD 38 --- --- MUXST3 MUXST2 MUXST1 MUXST0 --- TST

FMDEMSB 39 VCOM PCM --- SBSH SBA SBTO SBW SBT

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TDA7540B Software specification

5.2 Control register function

Table 10. Control register function

Register Name Function

A Charge pump high current

ACF Adjacent channel filter select

ACG Adjacent channel filter gain

ACM Threshold for startpoint adjacent channel mute

ACMD Adjacent channel mute depth

ACNTH Adjacent channel narrow band threshold

ACWTH Adjacent channel wide band threshold

AFSM AFS influence on stereodecoder mute

AFSON AFS Pin enable

AINBD AM IF noise blanker desensitivity

AINBT AM IF noise blanker threshold

AINT AM IF noise blanking time

AMAF AM audio filter

AMD AM prescaler

AMCF AM corner frequency

AMIN AM IF1 input select

AMNBD AM audio delay for noise blanking

AMNBFO AM audio noise blanker high pass filter order

AMNBHP AM audio noise blanker high pass filter frequency

AMON AM-FM switch

AMSEEK Set short time constant of AGC in AM seek mode

AMST AM stereo select

APPM Application mode quality detection

B Charge pump low current

BWCTL ISS filter fixed bandwith (ISS80) in automatic control

CASF Check alternative station frequency

CF Center frequency IF counter

CLKSEP Clock separation (only for testing)

CTLOFF Switch off automatic control of ISS filter

CURRH Set current high charge pump

DAGC AM narrow band AGC threshold

DEEMP Stereodecoder deemphasis

DEM Demodulator offset

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Software specification TDA7540B

Table 10. Control register function (continued)

Register Name Function

DESFT Stereodecoder deemphasis shift

DNB Demodulator spike blanking threshold

DTH Deviation detector threshold for ISS filter “OFF”

DWTH Deviation detector threshold for ISS filter narrow/wide

EW Frequency error window IF counter

F100K Corner frequency of AC-mute high pass filter

FMSEEK ISS time constant change in FM seek mode

HCON High cut enable

IF1T FM/AM mixer1 tank adjust

IF2T AM mixer2 tank adjust

IFAGC FM IF AGC

IFCM IF counter mode

IFENA IF counter enable

IFG IF1 amplifier gain (10.7MHz)

IFS IF counter sampling time

ISSIN Test input for ISS filter

ISSON ISS filter “ON”

ISS30 ISS filter 30KHz weather band

ISS80 ISS filter narrow/mid switch

KAGC FM keying AGC

LDENA Lock detector enable

LG Level gain adjust in stereodecoder

LM Local mode FM seek stop

LPF Loop filter input select

MAXHC Maximum high cut

MENA Softmute enable

MPAC Adjacent channel control by multipath

MPCC Multipath detector charge current

MPBPG Multipath detector bandpass filter gain

MPF Multipath filter frequency

MPG Multipath filter gain

MPION Multipath internal influence enable

MPOFF Multipath control “OFF”

MPPC Multipath influence on peak discharge current

MPRG Multipath detector rectifier gain

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TDA7540B Software specification

Table 10. Control register function (continued)

Register Name Function

MPTH Multipath threshold

MS Mono/Stereo switch automatically

MUXST Test multiplexer output stereodecoder

NBCTH Noise blanker noise controlled threshold

NBDTH Noise blanker deviation controlled threshold

NBFS Field strength controlled noise blanker

NBFT AM noise blanker fixed threshold

NBLTH Noise blanker low threshold

NBON Noise blanker enable

NBPC Noise blanker peak charge current

NBRR Noise blanker rectifier discharge resistor

NBSMP Strong multipath influence on noise blanker on/off

NBT Noise blanker time

ODCUR Current for overdeviation-correction

ODSW Overdeviation-correction enable

OUT Test output (only for testing)

PC Counter for PLL (VCO frequency)

PCM Pilot cancellation mode

PDH PD hold activation

PH I/Q mixer phase adjust

PTH Pilot threshold

QDC Quality detector coefficient

QNG Quality noise gain

RC Reference counter PLL

RFAGC FM RF AGC

RFKAGC FM RF keying AGC

ROC Roll-Off compensation

S Two mode switching output enable

SBA FM demodulator spike blanker attack mode

SBC Stereoblend control

SBSH FM demodulator spike blanker sample&hold mode

SBT FM demodulator spike blanker test mode

SBTO FM demodulator spike blanker toggle mode

SBW FM demodulator spike blanker window mode

SI Signal invertion

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Software specification TDA7540B

Table 10. Control register function (continued)

Register Name Function

SL S meter slider

SMODE Two mode switching output

SMCTH Softmute capacitor threshold for ISS “ON”

SMD Softmute depth threshold

SMO Softmute reference voltage offset

SMSL S meter slope

SMTH Softmute startpoint threshold

SSTH Unweighted fieldstrenght threshold for seek stop

STDON Stereodecoder on/off if muted

STDM Stereodecoder mute enable

STING Stereodecoder ingain

STVCO Stereodecoder VCO adjust

TDEV Time constant for deviation detector

TEST Testing PLL/IFC (only for testing)

TFCKL Fast clock for testing audioprocessor

TIN Switch FSU PIN to TEST input (only for testing)

TINAC Test input adjacent channel (only for testing)

TINACM Test input adjacent channel mute (only for testing)

TINMP Test input multipath(only for testing)

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

TMSA Test mode stereodecoder and audioprocessor

TOUT Switch FSU PIN to Test output (only for testing)

TST Test stereodecoder enable

TVMODE Tuning voltage offset mode

TVO Tuning voltage offset for prestage

TVWB Tuning voltage offset for prestage (weather band mode)

VCOD VCO divider

VCOM Stereodecoder VCO mode

VHCH Start level high cut

VHCL Stop level high cut

WAGC AM wide band AGC

XTAL Xtal frequency adjust

XTLIM Xtal amplitude limitation

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TDA7540B Software specification

Table 11. Subaddress

MSB LSB

I A5A4A3A2A1A0

000000Charge pump control

-------

100000STD9

-------

100111FMDEMSB

0 Page mode “OFF”

1 Page mode enable

5.2.1 Data Byte Specification

Table 12. Addr 0 Charge Pump Control

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0000High current = 0mA

Function

Function

0001High current = 0.5mA

0010High current = 1mA

0011High current = 1.5mA

-----

1111High current = 7.5mA

0 0 Low current = 0

0 1 Low current = 50

1 0 Low current = 100

1 1 Low current = 150

µA

µA

µA

µA

0 Select low current

1 Select high current

0 ISS time constant at PIN 27 available, FMSEEK “OFF”

1 ISS time constant at PIN 28 available, FMSEEK “ON”

Table 13. Addr 1 PLL Counter 1 (LSB)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

00000000LSB = 0

00000001LSB = 1

00000010LSB = 2

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Software specification TDA7540B

Table 13. Addr 1 PLL Counter 1 (LSB) (continued)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

---------

11111100LSB = 252

11111101LSB = 253

11111110LSB = 254

11111111LSB = 255

Table 14. Addr 2 PLL Counter 2 (MSB)

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

00000000MSB = 0

00000001MSB = 256

00000010MSB = 512

---------

11111100MSB = 64768

11111101MSB = 65024

11111110MSB = 65280

11111111MSB = 65536

Swallow mode: f

Table 15. Addr 3,4 TV1,2

VCO/fSYN

= LSB + MSB + 32

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0000000Tuning Voltage Offset = 0

0000001TVO = 25mV

Function

Function

0000010TVO = 50mV

---------

1111111TVO = 3175mV

0-TVO

1+TVO

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TDA7540B Software specification

Table 16. Addr 5 IF Counter Control 1

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

000t

001t

010t

011t

100t

101t

110t

111t

0 IF counter disable / stand by

1 IF counter enable

00 Not valid

0 1 IF counter FM mode

1 0 IF counter AM mode (450KHz)

1 1 IF counter AM mode (10.7MHz)

= 20.48ms (FM)128ms (AM )

Sample

= 10.24ms (FM)64ms (AM )

Sample

= 5.12ms (FM)32ms (AM )

Sample

= 2.56ms (FM)16ms (AM )

Sample

= 1.28ms (FM)8ms (AM )

Sample

= 640µs (FM)4ms (AM )

Sample

= 320µs (FM)2ms (AM)

Sample

= 160µs (FM)1ms (AM )

Sample

Function

0 Disable mute & AGC on hold in FM mode

1 Enable mute & AGC on hold in FM mode

0 Lock detector disable

1 Lock detector enable

Table 17. Addr 6 IF Counter Control 2

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

00000f

00001f

---------

01011f

01100f

01101f

01110f

01111f

---------

11111f

000 Not valid

= 10.60625MHz (FM) / 10.689MHz ; 449KHz (AM)

Center

= 10.61250MHz (FM) / 10.690MHz ; 450KHz (AM)

Center

= 10.67500MHz (FM) / 10.700MHz ; 460KHz (AM)

Center

= 10.68125MHz (FM) / 10.701MHz ; 461KHz (AM)

Center

= 10.68750MHz (FM) / 10.702MHz ; 462KHz (AM)

Center

= 10.69375MHz (FM) / 10.703MHz ; 463KHz (AM)

Center

= 10.70000MHz (FM) / 10.704MHz ; 464KHz(AM)

Center

= 10.80000MHz (FM) / 10.720MHz ;480KHz (AM)

Center

Function

001 Not valid

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Software specification TDA7540B

Table 17. Addr 6 IF Counter Control 2 (continued)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

010 Not valid

011 ∆f = 6.25kHz (FM)1kHz (AM)

100 ∆f = 12.5kHz (FM) 2kHz (AM)

101 ∆f = 25kHz (FM) 4kHz (AM)

110 ∆f = 50kHz (FM) 8kHz (AM)

111 ∆f = 100kHz (FM)16kHz (AM)

Table 18. Addr 7 AM Control

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0 Multipath information available FM at PIN 24

1 AM stereo output available at PIN 24

0 0 Prescaler ratio 10

0 1 Prescaler ratio 8

1 0 Prescaler ratio 6

1 1 Prescaler ratio 4

0 0 Disable additional TV1, 2 offset

0 1 Enable additional TV1 offset +3,175V (for weather band)

1 0 Enable additional TV2 offset +3,175V (for weather band)

1 1 Enable additional TV1, 2 offset +3,175V (for weather band)

0 TV is tracking with PLL

1 TV is independing on PLL

Function

0 Normal AGC time constant

1 Short time constant for AM seek stop

0 Disable local mode

1 Enable local mode (PIN diode current = 0.5mA)

Table 19. Addr 8 Quality ISS Filter

MSB

LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0 ISS filter control “ON”

1 ISS filter control “OFF”

0 Switch ISS filter “OFF”

1 Switch ISS filter “ON”

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TDA7540B Software specification

Table 19. Addr 8 Quality ISS Filter (continued)

MSB

LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0 Switch “OFF” ISS filter 120kHz

1 Switch “ON” ISS filter 80kHz

0 Switch “OFF” ISS filter 30KHz for weatherband

1 Switch “ON” ISS filter 30KHz for weatherband

000

001

010

discharge current1µA, charge current mid 74µA
narrow124µA

discharge current3µA, charge current mid 72µA
narrow122µA

discharge current5µA, charge current mid 70µA
narrow120µA

0 1 1 discharge current7µA, charge current mid 68

--- -

111

discharge current15µA,charge current mid
60µAnarrow110µA

Table 20. Addr 9 Quality Detection Adjacent Channel

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

ϖ narrow118µA

0/1 Not valid

0 AC highpass frequency 100kHz

1 AC bandpass frequency 100kHz

0 AC gain 32dB

1 AC gain 38dB

0 0 0 AC wide band threshold 0.25V

0 0 1 AC wide band threshold 0.35V

0 1 0 AC wide band threshold 0.45V

--- -

1 1 1 AC wide band threshold 0.95V

0 0 AC narrow band threshold 0.0V

0 1 AC narrow band threshold 0.1V

1 0 AC narrow band threshold 0.2V

1 1 AC narrow band threshold 0.3V

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Software specification TDA7540B

Table 21. Addr 10 Quality Detection Multipath

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0 Multipath control “ON”

1 Multipath control “OFF”

0 MP bandpass frequency 19KHz

1 MP bandpass frequency 31KHz

0 MP gain 12dB

1 MP gain 23dB

0 0 MP threshold 0.50V

0 1 MP threshold 0.75V

1 0 MP threshold 1.00V

1 1 MP threshold 1.25V

0 0 Application mode 1

0 1 Application mode 2

0 Multipath eliminates ac

1 Multipath eliminates ac and ac+

Table 22. Addr 11 Quality Deviation Detection

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0 0 0 charge current 39µA

0 0 1 charge current 37µA

0 1 0 charge current 35µA

0 1 1 charge current 33µA

, discharge current 1µA

, discharge current 3µA

, discharge current 5µA

, discharge current 7µA

----

1 1 1 charge current 25µA

, discharge current 15µA

0 0 DEV threshold for ISS narrow/wide 30kHz

0 1 DEV threshold for ISS narrow/wide 45kHz

1 0 DEV threshold for ISS narrow/wide 60kHz

Function

1 1 DEV threshold for ISS narrow/wide 75kHz

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

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TDA7540B Software specification

Table 22. Addr 11 Quality Deviation Detection (continued)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0

1

Disable ISS filter to fixed bandwith (ISS80) in automatic
control

Enable ISS filter to fixed bandwith (ISS80) in automatic
control

Table 23. Addr 12 Softmute Control 1

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0 0 0 Startpoint mute 0 in application about 3dB

0 0 1 Startpoint mute 1 in application about 4dB

----

1 1 1 Startpoint mute 7 in application about 10dBµV antenna level

0 0 0 0 Mute depth 0 in application 18dB

0 0 0 1 Mute depth 1 in application 20dB

0 0 1 0 Mute depth 2 in application 22dB

0 0 1 1 Mute depth 3 in application 24dB

---- - (logarithmically behaviour)

1 1 1 1 Mute depth 15 in application 36dB

0 FM mute disable, (has to be 0 in AM mode)

µV antenna level

µV antenna level

1 FM mute enable

Table 24. Addr 13 Softmute Control 2

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0 Disable mute threshold for ISS filter “ON”

1 Enable mute threshold for ISS filter “ON”

0 0 AC mute depth 10dB

0 1 AC mute depth 8dB

1 0 AC mute depth 6dB

1 1 AC mute depth 4dB

0 0 0 0 AC mute threshold 60mV

0 0 0 1 AC mute threshold 80mV

0 0 1 0 AC mute threshold 100mV

---- -

0 1 1 1 AC mute threshold 340mV

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Function

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Software specification TDA7540B

Table 24. Addr 13 Softmute Control 2 (continued)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

1 1 1 1 AC mute “OFF”

0 AC mute filter 110KHz

1 AC mute filter 100KHz

Table 25. Addr 14 VCODIV/PLLREF

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

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

1 0 0 PLL reference frequency 50KHz

1 0 1 PLL reference frequency 25KHz

1 1 0 PLL reference frequency 10KHz

1 1 1 PLL reference frequency 9KHz

0 0 0 PLL reference frequency 2KHz

0 Select FM mode

1 Select AM mode

0 Select PLL low pass filter FM

1 Select PLL low pass filter AM

Table 26. Addr 15 FM AGC

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0 0 RFAGC threshold V

0 1 RFAGC threshold V

1 0 RFAGC threshold V

1 1 RFAGC threshold V

0 0 IFAGC threshold V

0 1 IFAGC threshold V

1 0 IFAGC threshold V

1 1 IFAGC threshold V

9-11TH

9-11TH

9-11TH

9-11TH

77TH

77TH

77TH

77TH

Function

= 85(77 ANT)dBµV

= 90(82 ANT)dBµV

= 94(86 ANT)dBµV

= 96(88 ANT)dBµV

= 86(60 ANT)dBµV

= 92(66 ANT)dBµV

= 96(70 ANT)dBµV

= 98(72 ANT)dBµV

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TDA7540B Software specification

Table 26. Addr 15 FM AGC (continued)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0 0 0 KAGC threshold 80dBµV

0 0 1 KAGC threshold 82dB

0 1 0 KAGC threshold 84dB

0 1 1 KAGC threshold 86dB

1 0 0 KAGC threshold 88dB

µV

µV

µV

µV

1 0 1 KAGC threshold 90dBµV

1 1 0 KAGC threshold 92dBµV

1 1 1 Keying AGC “OFF”

0RF KAGC“0FF”

1RF KAGC“0N”

Table 27. Addr 16 AM AGC

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0000WAGC V

0001WAGC V

0010WAGC V

0011

WAGC V
ANT)dBµ

0100WAGC V

0101WAGC V

0110

0111

WAGC V
ANT)dBµ

WAGC V
ANT)dBµ

1000WAGC V

1001WAGC V

1010WAGC V

1011

WAGC V
ANT)dBµ

= 90(65 ANT)dBµ V

4TH

= 94(69 ANT)dBµ V

4TH

= 97(72 ANT)dBµ V

4TH

= 98,5(73,5 ANT)dBµ V

4TH

= 100(75 ANT)dBµ V

4TH

= 101,5(76,5 ANT)dBµ V

4TH

= 102,5(77,5 ANT)dBµV

4TH

= 103,5(78,5 ANT)dBµV

4TH

= 104,5(79,5 ANT)dBµ V

4TH

= 105(80 ANT)dBµ V

4TH

= 106(81 ANT)dBµ V

4TH

= 106,5(81,5 ANT)dBµV

4TH

= 90(60 ANT)dBµ

71TH

= 94(64 ANT)dBµ

71TH

= 96,5(66,5 ANT)dBµ

71TH

= 98,5(68,5

71TH

= 100(70 ANT)dBµ

71TH

= 101(71 ANT)dBµ

71TH

= 102,5(72,5

71TH

= 103,5(73,5

71TH

= 104(74 ANT)dBµ

71TH

= 105(75 ANT)dBµ

71TH

= 105,5(75,5 ANT)dBµ

71TH

= 106,5(76,5

71TH

1100WAGC V

1101WAGC V

1110WAGC V

1111WAGC V

0000 DAGC V

= 107(82 ANT)dBµ V

4TH

= 108(83 ANT)dBµ V

4TH

= 108,5(83,5 ANT)dBµ V

4TH

= 109(84 ANT)dBµ V

4TH

= 74(44 ANTENNA)dBµ

71TH

= 107(77 ANT)dBµ

71TH

= 107,5(77,5 ANT)dBµ

71TH

= 108(78 ANT)dBµ

71TH

= 108,5(78,5 ANT)dBµ

71TH

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Software specification TDA7540B

Table 27. Addr 16 AM AGC (continued)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0001 DAGC V

0010 DAGC V

0011 DAGC V

0100 DAGC V

0101 DAGC V

0110 DAGC V

0111 DAGC V

1000 DAGC V

1001 DAGC V

1010 DAGC V

1011 DAGC V

1100 DAGC V

1101 DAGC V

1110 DAGC V

1111 DAGC V

Table 28. Addr 17 FM Demodulator Fine Adjust

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

= 77(47 ANTENNA)dBµ

71TH

= 79(49 ANTENNA)dBµ

71TH

= 80,5(50,5 ANTENNA)dBµ

71TH

= 82(52 ANTENNA)dBµ

71TH

= 83,5(53,5 ANTENNA)dBµ

71TH

= 85(55 ANTENNA)dBµ

71TH

= 86,5(56,5 ANTENNA)dBµ

71TH

= 88(58 ANTENNA)dBµ

71TH

= 89(59 ANTENNA)dBµ

71TH

= 90(60 ANTENNA)dBµ

71TH

= 91(61 ANTENNA)dBµ

71TH

= 92(62 ANTENNA)dBµ

71TH

= 93(63 ANTENNA)dBµ

71TH

= 94(64 ANTENNA)dBµ

71TH

= 96(66 ANTENNA)dBµ

71TH

Function

0000000mV

000001+8.5mV

000010+17mV

-------

011111+263.5mV

1000000mV

100001-8.5mV

100010-17mV

-------

111111-263.5mV

0 0 Spike cancelation ”OFF”

0 1 Threshold for spike cancelation 750mV

1 0 Threshold for spike cancelation 270mV

1 1 Threshold for spike cancelation 520mV

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TDA7540B Software specification

Table 29. Addr 18 S-Meter Slider

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0000S meter slider offset SL=0dB

0001S meter offset SL=1dB

0010S meter offset SL=2dB

-----

1111S meter offset SL=15dB

0 S meter offset -SL

1 S meter offset +SL

0 S Meter slope 1V/decade

1 S meter slope 1.5V/decade

0 Overdeviation correction current max=45µA

1 Overdeviation correction current max=90µA

0 Overdeviation correction “OFF”

1 Overdeviation correction “ON”

Table 30. Addr 19 IF GAIN/XTAL Adjust

Function

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0 Xtal amplitude limitation disable

1 Xtal amplitude limitation enable

0 0 IF1 gain1 9dB

0 1 IF1 gain1 12dB

1 0 IF1 gain1 15dB

1 1 IF1 gain1 18dB

00000 C

00001 C

00010 C

00011 C

00100 C

----- -

11111 C

Load

Load

Load

Load

Load

Load

Function

0pF

0.75pF

1.5pF

2.25pF

3pF

23.25pF

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Software specification TDA7540B

Table 31. Addr 20 Tank Adjust

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0 0 0 0 450kHz 0pF

0 0 0 1 450kHz 1.6pF

0 0 1 0 450kHz 3.2pF

0 0 1 1 450kHz 4.8pF

-----

1 1 1 1 450kHz 24pF

0 0 0 0 10.7MHz 0pF

0 0 0 1 10.7MHz 0.55pF

0 0 1 0 10.7MHz 1.1pF

0 0 1 1 10.7MHz 1.65pF

---- -

1 1 1 1 10.7MHz 8.25pF

Table 32. Addr 21 I/Q FM Mixer1 Adjust

Function

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0000-7 degree

0001-6 degree

0010-5 degree

-----

01110 degree

1000+1 degree

1001+2 degree

-----

1111+8degree

0 0 Softmute reference offset OFF

0 1 Softmute reference offset -50mV

1 0 Softmute reference offset -100mV

1 1 Softmute reference offset -150mV

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TDA7540B Software specification

Table 33. Addr 22 AM IF Noise Blanker

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0000AINBT 0mV

0001AINBT 12.5mV

0010AINBT 25mV

-----

1111AINBT 187.5mV

0 0 AINBD “ON”

0 1 AINBD 4.0V

1 0 AINBD 3.2V

1 1 AINBD “OFF”

00 AINT 8

01 AINT 11

10 AINT 14

11 AINT 17

Table 34. Addr 23 Switch Control

Function

µs

µs

µs

µs

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0 S1 LOW output voltage

1 S1 HIGH output voltage

0 S1 emitter output available

1 S1 open collector output available

0 S2 LOW output voltage

1 S2 HIGH output voltage

0 S2 emitter output available

1 S2 open collector output available

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

0 0 0 1 SSTOP= H if IFC=H&FSU>0.89V

0 0 1 0 SSTOP= H if IFC=H&FSU>1.16V

0 0 1 1 SSTOP= H if IFC=H&FSU>1.43V

----

1 1 1 1 SSTOP= H if IFC=H&FSU>4.67V

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Software specification TDA7540B

Table 35. Addr 24 Stereodecoder 1

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0 Test mode stereodecoder and audioprocessor “ON”

1 Test mode stereodecoder and audioprocessor “OFF”

0 Audio AM noise blanker fix threshold disable

1 Audio AM noise blanker fix threshold enable

0 Fast clock for testing audioprocessor “ON”

1 Fast clock for testing audioprocessor “OFF”

0 Audio inverter OFF

1 Audio inverter ON

0 0 Audio noise blanking time (FM = 38µs, AM = 1.2 ms)

0 1 Audio noise blanking time (FM = 25,5µs, AM = 0.8 ms)

1 0 Audio noise blanking time (FM = 32µs, AM = 1.0 ms)

1 1 Audio noise blanking time (FM = 22µs, AM = 0.64 ms)

0 Stereodecoder VCO adjust minus

1 Stereodecoder no VCO adjust

0 Stereodecoder VCO adjust plus

1 Stereodecoder no VCO adjust

Table 36. Addr 25 Stereodecoder 2

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0 Stereo decoder mute disable

1 Stereo decoder mute enable

0 Stereo decoder “ON” if muted

1 Stereo decoder “OFF” if muted

0 Forced MONO, must be set in AM

1 MONO/STEREO switch automatically

0 Noise blanker peak charge current low

1 Noise blanker peak charge current high

0 Pilot threshold high

Function

1 Pilot threshold low

0 Deemphasis 50

1 Deemphasis 75

µs

µs

0 0 Stereodecoder ingain = 3,75dB

0 1 Stereodecoder ingain = 2,5dB

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TDA7540B Software specification

Table 36. Addr 25 Stereodecoder 2 (continued)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

1 0 Stereodecoder ingain = 1,25dB

1 1 Stereodecoder ingain = 0dB

Table 37. Addr 26 Stereodecoder 3

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0 0 0 Audio noise blanker low threshold 280mV

0 0 1 Audio noise blanker low threshold 261mV

0 1 0 Audio noise blanker low threshold 242mV

0 1 1 Audio noise blanker low threshold 223mV

1 0 0 Audio noise blanker low threshold 204mV

1 0 1 Audio noise blanker low threshold 185mV

1 1 0 Audio noise blanker low threshold 166mV

1 1 1 Audio noise blanker low threshold 147mV

0 0 Audio noise blanker noise controlled threshold 1200mV

0 1 Audio noise blanker noise controlled threshold 950mV

1 0 Audio noise blanker noise controlled threshold 700mV

1 1 Audio noise blanker noise controlled threshold 450mV

0 Audio noise blanker OFF

1 Audio noise blanker ON

0 0 Deviation adjust 2,0V

Function

0 1 Deviation adjust 1,5V

1 0 Deviation adjust 1,0V

1 1 Deviation detector off

Table 38. Addr 27 Stereodecoder 4

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0 High Cut OFF

1 High Cut ON

0 0 max. High Cut 10dB

0 1 max. High Cut 5.5dB

1 0 max. High Cut 7.5dB

1 1 max. High Cut 8.5dB

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Function

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Software specification TDA7540B

Table 38. Addr 27 Stereodecoder 4 (continued)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0 0 Start level High Cut at 42% REF5V

0 1 Start level High Cut at 50% REF5V

1 0 Start level High Cut at 58% REF5V

1 1 Start level High Cut at 66% REF5V

0 0 Stop level High Cut at 11% VHCH

0 1 Stop level High Cut at 18.3% VHCH

1 0 Stop level High Cut at 25.7% VHCH

1 1 Stop level High Cut at 33% VHCH

0 Strong multipath influence on peak discharge OFF

1 Strong multipath influence on peak discharge ON

Table 39. Addr 28 Stereodecoder 5

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

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

0 0 Audio noise blanker field strength adjust 2,0V

0 1 Audio noise blanker field strength adjust 1,6V

1 0 Audio noise blanker field strength adjust 1,4V

1 1 Audio noise blanker field strength adjust OFF

0 0 Quality detector coefficient a=0,6

0 1 Quality detector coefficient a=0,75

1 0 Quality detector coefficient a=0,9

1 1 Quality detector coefficient a=1,05

0 Multipath influence on peak discharge OFF

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

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TDA7540B Software specification

Table 40. Addr 29 Stereodecoder 6

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0 0 Noise rectifier discharge resistor = infinite

0 1 Noise rectifier discharge resistor =56K

1 0 Noise rectifier discharge resistor =33K

1 1 Noise rectifier discharge resistor =18K

0 0 Multipath detector band pass gain =6dB

0 1 Multipath detector band pass gain =12dB

1 0 Multipath detector band pass gain =9dB

1 1 Multipath detector band pass gain =10,5dB

0 Multipath detector internal influence ON

1 Multipath detector internal influence OFF

0 Multipath detector charge current =0,8µA

1 Multipath detector charge current =0,4µA

0 0 Multipath detector rectifier gain =7,6dB

0 1 Multipath detector rectifier gain =4,6dB

1 0 Multipath detector rectifier gain =0dB

1 1 Multipath detector rectifier gain disabled

Table 41. Addr 30 Stereodecoder 7

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0000Roll-Off compensation not allowed

0001Roll-Off compensation 17.1%

0010Roll-Off compensation 15.2%

0011Roll-Off compensation 13.3%

0100Roll-Off compensation 11.4%

0101Roll-Off compensation 9.6%

0110Roll-Off compensation 7.8%

0111Roll-Off compensation 6.0%

1000Roll-Off compensation not allowed

1001Roll-Off compensation 4,7%

1010Roll-Off compensation 2.9%

1011Roll-Off compensation 1.3%

1100Roll-Off compensation -0.2%

1101Roll-Off compensation -1.8%

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Software specification TDA7540B

Table 41. Addr 30 Stereodecoder 7 (continued)

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

1110Roll-Off compensation -3.4%

1111Roll-Off compensation -5%

0 0 0 Level gain 0dB

0 0 1 Level gain 0.67dB

0 1 0 Level gain 1.34dB

--- -

1 1 1 Level gain 4.7dB

0 AM audio filter “OFF”

1 AM audio filter “ON”

Table 42. Addr 31 Stereodecoder 8

MSB LSB

d7 d6 d5 d4 d3 d2 d1 d0

0 0 Quality noise gain =6dB

0 1 Quality noise gain =9dB

1 0 Quality noise gain =12dB

1 1 Quality noise gain =15dB

0 Enable AFS PIN

1 Disable AFS PIN

0 AFS inluence on stereodecoder mute

1 No AFS inluence on stereodecoder mute

0 PD hold activation if AFS<V

1 PD hold activation if AFS<V

0 AM audio noise blanker high pass filter frequency 10KHz

1 AM audio noise blanker high pass filter frequency 20KHz

0 AM audio noise blanker high pass filter order 1st

1 AM audio noise blanker high pass filter order 2nd

Function

th1

th2

0 AM audio delay for noise blanking “OFF”

1 AM audio delay for noise blanking “ON”

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TDA7540B Software specification

Table 43. Addr 32 Stereodecoder 9

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

0 Deemphasis shift (25/37.5

1 Deemphasis no shift (50/75

µs)

µs)

0 0 0 0 0 AM corner frequency = 3.18kHz

0 0 0 0 1 AM corner frequency = 3.10kHz

0 0 0 1 0 AM corner frequency = 3.02kHz

-----

1 1 1 0 1 AM corner frequency = 1.12kHz

1 1 1 1 1 AM corner frequency = 1.06kHz

Table 44. Addr 33 Test Tuner Control 1

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

xxxxxxxxOnly for testing ( have to be set to 0)

Table 45. Addr 34 Test Tuner Control 2

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

xxxxxxxxOnly for testing ( have to be set to 0)

Table 46. Addr 35 Test Tuner Control 3

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

xxxxxxxxOnly for testing ( have to be set to 0)

Table 47. Addr 36 Test TUNER Control 4

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

xxxxxxxxOnly for testing ( have to be set to 0)

Table 48. Addr 37 Test TUNER Control 5

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

xxxxxxxxOnly for testing ( have to be set to 0)

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Software specification TDA7540B

Table 49. Addr 38 Test Stereodecoder Control

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

xxxxxxx0Only for testing ( have to be set to 1)

Table 50. Addr39 FM Demodulator Spike Blanker And Stereo Decoder

MSB LSB

Function

d7 d6 d5 d4 d3 d2 d1 d0

xxxxxxx0Spike blanker testing “OFF”

1 Spike blanker testing “ON”

0 Spike blanker window mode: early + late

1 Spike blanker window mode: early - late

0 Spike blanker toggledetector disable

1 Spike blanker toggledetector enable

0 Spike blanker slow attack

1 Spike blanker fast attack

0 Spike blanker S&H mode: ignore restore

1 Spike blanker S&H mode: standard

1 Stereo decoder VCO ON (mandatory in FM mode)

0 Stereo decoder VCO OFF

0 Pilot cancellation mode: always

1 Pilot cancellation mode: if pilot > threshold

0 Stereo decoder VCO set456

1 Stereo decoder VCO free running

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TDA7540B Appendix

6 Appendix

Figure 8. Block diagram I/Q mixer

Figure 9. Block diagram VCO

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Appendix TDA7540B

Figure 10. Block diagram keying AGC

Figure 11. Block diagram ISS function

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TDA7540B Appendix

Block Diagram Quality Detection Principle (without overdeviation correction)

Table 51.

Signal LOW HIGH

ac No adjacent channel Adjacent channel present

ac+ No strong adjacent channel Adjacent channel higher as ac

sm Fieldstrength higher as softmute threshold Fieldstrength lower as softmute threshold

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

Table 52.

Input Signals Mode1 Mode2

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

000000 0wide0 0wide

000100 0wide0 0wide

000110 0wide0 0wide

0 0 1 0 0 1 1 narrow 1 1 narrow

001100 0wide1 0mid

001110 0wide0 0wide

100001 1narrow1 0mid

1 1 0 0 0 1 1 narrow 1 1 narrow

100101 0mid1 0mid

110111 0mid1 1narrow

1 0 1 0 0 1 1 narrow 1 1 narrow

1 1 1 0 0 1 1 narrow 1 1 narrow

101101 0mid1 0mid

111101 0mid1 1narrow

101111 0mid1 0mid

111111 0mid1 1narrow

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Appendix TDA7540B

Figure 12. Block diagram AM part

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TDA7540B Appendix

Figure 13. Blockdiagram AM IF Noise Blanker

Figure 14. Block diagram Stereodecoder

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Appendix TDA7540B

Figure 15. Block diagram Audio Noise Blanker

Figure 16. Block diagram Multipath Detection

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TDA7540B Appendix

Figure 17. Block diagram AFS function

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Part List (Application and measurment circuit) TDA7540B

7 Part List (Application and measurment circuit)

Table 53. Part list

Item Description

F1 TOKO 5KG 611SNS-A096GO

F2 TOKO 5KM 396INS-A467AO

F3 TOKO MC152 E558CN-100021=P3

F4 TOKO 7PSG P826RC-5134N

F5 TOKO PGL 5PGLC-5103N

L1 TOKO FSLM 2520-150 15µH

L2,L4 TOKO FSLM 2520-680 68µH

L3,L8 SIEMENS SIMID03 B82432 1mH

L5 TOKO LL 2012-220

L6 TOKO LL 2012-270

L7 TOKO LL 2012-22.0

CF1,CF2 muRata SFE10.7MS3A10-A 180KHz or (TOKO CFSK107M3-AE-20X)

CF3 muRata SFE10.7MJA10-A 150KHz or (TOKO CFSK107M4-AE-20X)

CF4 muRata SFPS 450H 6KHz or (TOKO ARLFC450T)

D1 TOSHIBA 1SV172

D2,D3 TOKO KP2311E

D4 TOKO KV1370NT

D5 PHILIPS BB156

Q1 TOSHIBA HN3G01J

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TDA7540B Application circuit

8 Application circuit

Figure 18. Application circuit

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Application Notes TDA7540B

9 Application Notes

Following items are important to get highest performance of TDA7540 in application:

1. In order to avoid leakage current from PLL loop filter input to ground a guardring is

recommended around loop filter PIN’s with PLL reference (VREF2) voltage potential.

2. Distance between Xtal and VCO input PIN 18 should be far as possible and Xtal

package should get a shield versus ground.

3. Blocking of VCO supply should be near at PIN 20 and PIN 21.

4. Blocking of VCC2 supply should be near at PIN 64 and PIN 61.

5. Wire lenght to FM mixer1-input and -output should be symetrically and short.

6. FM demodulator capacitance at PIN 56 should be sense connected as short as

possible versus demodulator ground at PIN 57.

7. Wire lenght from AM mixer tank output to 9KHz ceramic filter input has to be short as

possible.

8. To minimize “AM TWEET” the AM demodulator capacitor should be connected versus

GNDVCC1 at PIN 41 and FSU output at PIN 22 should be filtered with capacitor of
about 2,2nF versus GNDVCC2.

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TDA7540B Package Information

10 Package Information

In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97.

The maximum ratings related to soldering conditions are also marked on the inner box label.

ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.

Figure 19. TQFP80 (14x14x1.40mm) Mechanical Data & 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 0.057

B 0.22 0.32 0.38 0.009 0.013 0.015

C 0.09 0.20 0.003 0.008

D 16.00 0.630

D1 14.00 0.551

D3 12.35 0.295

e 0.65 0.0256

E 16.00 0.630

E1 14.00 0.551

E3 12.35 0.486

L 0.45 0.60 0.75 0.018 0.024 0.030

L1 1.00 0.0393

K3.5

mm inch

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

°

(min.), 7°(max.)

D

D1

D3

60

61

OUTLINE AND

MECHANICAL DATA

TQFP80

(14x14x1.40mm)

A

A2

41

40

0.10mm

Seating Plane

A1

.004

e

E3

E1 E

B

IDENTIFICATION

80

1

PIN 1

21

20

TQFP80L

Gage plane

0.25mm

K

L

L1

C

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Revision history TDA7540B

11 Revision history

Table 54. Document revision history

Date Revision Changes

10-May-2006 1 Initial release.

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TDA7540B

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