ST TDA7540N User Manual

TDA7540N

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 IFand 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

Table 1. Device summary

LQFP80

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 I2C-Bus controlled

Description

The TDA7540N 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.

Order code	Temp range, °C	Package	Packing
TDA7540N	-40 to 85°C	LQFP80 (14x14x1.4mm)	Tube
TDA7540NTR	-40 to 85°C	LQFP80 (14x14x1.4mm)	Tape and reel

November 2007

Rev 1

1/76

www.st.com

Contents	TDA7540N

Contents

1	Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 7
2	Pins description and connection diagrams . . . . . . . . . . . . . . . . . . . . .		. 8
	2.1	LQFP80 pins connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
	2.2	Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
3	Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		11

3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3.1 Globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3.2 FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.3.3 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.3.4 Stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.3.5 PLL Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4	Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		27
	4.1	FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27

4.1.1 Mixer1, AGC and 1.IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.1.2 Mixer2, limiter and demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.1.3 Quality detection and ISS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.1.4 Soft mute control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4.2 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 4.3 Stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.3.1 Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 4.3.2 Functional description of the noise blanker . . . . . . . . . . . . . . . . . . . . . . 32 4.3.3 Functional description of the multipath-detector . . . . . . . . . . . . . . . . . . 33 4.3.4 Quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 4.3.5 AFS control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 34

4.4	PLL and IF counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		34
	4.4.1	PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	34
	4.4.2	IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	35
4.5	I2C-Bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		37

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TDA7540N Contents

5	Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		39
	5.1	Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	39
	5.2	Control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	40

5.2.1 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

6	Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	64
7	Part list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	71
8	Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	72
9	Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	73
10	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	74
11	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	75

3/76

List of tables	TDA7540N

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 5. Globals electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 6. FM section electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 7. AM section electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 8. Stereodecoder electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 9. PLL electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Table 10. Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Table 11. Control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Table 12. Subaddress. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Table 13. Addr 0 Charge Pump Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Table 14. Addr 1 PLL counter 1 (LSB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Table 15. Addr 2 PLL counter 2 (MSB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Table 16. Addr 3,4 TV1,2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Table 17. Addr 5 IF counter control 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Table 18. Addr 6 IF counter control 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Table 19. Addr 7 AM control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Table 20. Addr 8 quality ISS filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Table 21. Addr 9 quality detection adjacent channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Table 22. Addr 10 quality detection multipath. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Table 23. Addr 11 quality deviation detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Table 24. Addr 12 softmute control 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Table 25. Addr 13 softmute control 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Table 26. Addr 14 VCODIV/PLLREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Table 27. Addr 15 FM AGC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Table 28. Addr 16 AM AGC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Table 29. Addr 17 FM demodulator fine adjust. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Table 30. Addr 18 S-meter slider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Table 31. Addr 19 IF GAIN/XTAL adjust. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Table 32. Tank adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Table 33. Addr 21 I/Q FM mixer1 adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Table 34. Addr 22 AM IF noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Table 35. Addr 23 switch control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Table 36. Addr 24 stereodecoder 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Table 37. Addr 25 stereodecoder 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Table 38. Addr 26 stereodecoder 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Table 39. Addr 27 stereodecoder 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Table 40. Addr 28 stereodecoder 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Table 41. Addr 29 stereodecoder 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Table 42. Addr 30 stereodecoder 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Table 43. Addr 31 stereodecoder 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Table 44. Addr 32 stereodecoder 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Table 45. Addr 33 test tuner control 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Table 46. Addr 34 test tuner control 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Table 47. Addr 35 test tuner control 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Table 48. Addr 36 test tuner control 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

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TDA7540N	List of tables

Table 49. Addr 37 test tuner control 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Table 50. Addr 38 test stereodecoder control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Table 51. Addr39 test FM demodulator spike blanker and stereo decoder . . . . . . . . . . . . . . . . . . . . 63 Table 52. Block diagram quality detection principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Table 53. Functional mode quality detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Table 54. Part list (applicationand measurment circuit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Table 55. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5/76

List of figures	TDA7540N

List of figures

Figure 1. Block circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 2. LQFP80 pins connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 3. Trigger threshold vs. VPEAK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 4. Deviation controlled trigger adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 5. Field strength controlled trigger adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 6. Relation between internal and external level-voltagees and setup of stereoblend . . . . . . . 31

Figure 7. Highcut characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Figure 8. Block diagram I/Q mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Figure 9. Block diagram VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Figure 10. Block diagram keying AGC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Figure 11. Block diagram ISS function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Figure 12. Block diagram AM part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Figure 13. Block diagram AM IF noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Figure 14. Block diagram stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Figure 15. Block diagram audio noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Figure 16. Block diagram multipath detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Figure 17. Block diagram AFS function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Figure 18. Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Figure 19. LQFP80 (14x14x1.40mm) mechanical data and package dimensions. . . . . . . . . . . . . . . . 74

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TDA7540N	Block diagram

1 Block diagram

Figure 1. Block circuit diagram

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Pins description and connection diagrams	TDA7540N

2 Pins description and connection diagrams

2.1LQFP80 pins connection diagram

Figure 2. LQFP80 pins connection (top view)

					MIX1OUT2				TEST2				AMAGC2TC				IF1AGCIN				GNDIF1				IF1AMP1IN				IF1REF				IF1AMP1OUT				VCCIF1				IF1AMP2IN				AMREFDEMC				AMDETC				IF1AMP2OUT				AMRFAGCTC				FMM1X2REF				FMM1X2IN				VCC2				AMMIX2OUT1				AMMIX2OUT2				GNDVCC2
		80						79				78				77				76				75		74				73				72				71				70						69		68				67				66				65				64					63				62				61
MIX1 OUT1			1																																																																												60							VREF1
TEST1			2																																																																												59							AMIF2IN
DEVTC			3																																																																												58							MPXW
AMMIX1IN			4																																																																												57							GNDDEM
AMMIX1REF			5																																																																												56							FMREFDEMC
AMRFAGCOUT			6																																																																												55							AMIF2REF
AMPINDR			7																																																																												54							AMIF2BPF
FMPINDR			8																																																																												53							MPXOUT
FMMIX1IN1			9																																																																												52							AFS
GNDRF			10																																																																												51							VCCSTEREO
FMMIX1IN2			11																																																																												50							MPXIN
TV1		12																																																																													49							MUTETC
TV2		13																																																																													48							MPTC
ISSSTATUS		14																																																																													47							GNDSTEREO
S1		15																																																																													46							QUALYOUT
FMAGCTC		16																																																																													45							FSWO
S2		17																																																																													44							VCC1
VCOB		18																																																																													43							L
VCOE		19																																																																													42							R
VCCVCO		20																																								31						32		33				34				35				36																	41							GNDVCC1
		21						22				23				24				25				26		27				28				29				30																												37					38				39				40
					GNDVCO				FSU				ADJCH				AMST/MP				STEREO				XTALG				ISSTC1				ISSTC2				XTALD				SSTOP				SDA				SCL				FSTC				GNDVCC3				LPOUT				VCC3				VREF2				LPAM				LPFM				LPHC				D06AU1653

2.2Pin description

Table 2.	Pin description
Pin #	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

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TDA7540N			Pins description and connection diagrams
	Table 2.	Pin description	(continued)
	Pin #	Pin name	Function
	10	GNDRF	RF ground
	11	FMMIX1IN2	FM mixer1 input2
	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	STEREO	Stereo information indication 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
	31	SDA	I2C-Bus data
	32	SCL	I2C-Bus clock
	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

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Pins description and connection diagrams				TDA7540N
	Table 2.	Pin description	(continued)
	Pin #	Pin name	Function
	47	GNDSTEREO	Strereodecoder ground
	48	MPTC	Multipath time constant
	49	MUTETC	Weak signal mute time constant
	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

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TDA7540N	Electrical specifications

3 Electrical specifications

3.1Absolute maximum ratings

Table 3.	Absolute maximum ratings
Symbol	Parameter	Value	Units
VS	Supply voltage	9.5	V
Tamb	Ambient temperature	-40 to 85	°C
Tstg	Storage temperature	-55 to 150	°C

3.2Thermal data

Table 4.	Thermal data
Symbol	Parameter		Value	Unit
Rth(j-amb)	Thermal resistance junction to ambient	Max.	55	°C/W

3.3Electrical characteristics

3.3.1Globals

Table 5. Globals electrical characteristics

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 =8.5V, fXtal = 10.25MHz, in application circuit, unless otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
Supply
VCC1	Digital supply voltage		7.7	8.5	9	V
VCC2	Analog supply voltage		7.7	8.5	9	V
VCC3	Analog tuning voltage		7.7	8.5	9	V
VCCVCO	VCO supply voltage		7.7	8.5	9	V
VCCMIX1	MIX1 supply voltage		7.7	8.5	9	V
VCCMIX2	MIX2 supply voltage		7.7	8.5	9	V
VCCIF1	IF1 supply voltage		7.7	8.5	9	V
VCCST	Stereo supply voltage		7.7	8.5	9	V
ICC1	Supply current	FM ON		10	12	mA
ICC1	Supply current	AM ON		10	12	mA
ICC2	Supply current	FM ON / VCO:3		65	78	mA
ICC2	Supply current	AM ON		75	90	mA

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Electrical specifications	TDA7540N

Table 5. Globals electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 =8.5V, fXtal = 10.25MHz, in application circuit, unless otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
ICC3	Supply current			2	3	mA
ICCVCO	Supply current			8	10	mA
ICCMIX1	Supply current	FM ON		8	10	mA
ICCMIX1	Supply current	AM ON		7	8.5	mA
ICCMIX2	Supply current	AM ON		7	8.5	mA
ICCIF1	Supply current			5	6.5	mA
ICCST	Supply current			12	13.5	mA
Reference voltages
VREF1	Internal reference voltage	IREF1 = 0mA	4.8	5	5.2	V
VREF2	Internal reference voltage	IREF2 = 0mA	2.4	2.5	2.6	V
I2C-Bus interface
fSCL	Clock frequency				400	kHz
VIL	Input low voltage				1	V
VIH	Input high voltage		3		5	V
IIN	Input current		-5		5	μA
VO	Output acknowledge voltage	IO = 1.6mA			0.4	V

3.3.2FM section

Table 6. FM section electrical characteristics

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, fRF = 98MHz, dev= 40kHz, fMOD = 1kHz, fXtal = 10.25MHz, in application circuit, unless

otherwise specified).

	Symbol		Parameter	Test conditions	Min.	Typ.	Max.	Unit
	Wide band RF AGC
	V9-11		Lower threshold start	V16 = 2.5V	83	85	87	dBμV
	V9-11		Upper threshold start	V16 = 2.5V	94	96	98	dBμV
	Narrow band IF & keying AGC
	V77		Lower threshold start	KAGC = off, V9-11 = 0mVRMS	84	86	88	dBμV
	V77		Upper threshold start	KAGC = off, V9-11 = 0mVRMS	96	98	100	dBμV
			Lower threshold start with	KAGC = max,
	V	77		V9-11 = 0mVRMS,	96	98	100	dBμV
			KAGC
				fIF=300KHz

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TDA7540N	Electrical specifications

Table 6. FM section electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, fRF = 98MHz, dev= 40kHz, fMOD = 1kHz, fXtal = 10.25MHz, in application circuit, unless

otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
		KAGC = max,
V22	Startpoint KAGC	V9-11 = 0mVRMS,		2.2		V
		fIF=300KHz
		fIF1 generates FS level at V22
	Control range KAGC	V22= +0.8V		16		dB
RIN	Input resistance		10	13	16	kΩ
CIN	Input capacitance			2.5		pF
AGC time constant output
V16	Max. AGC output voltage	V9-11 = 0mVRMS			VREF1	V
					+VBE
V16	Min. AGC output voltage	V9-11 = 50mVRMS			0.5	V
I16	Min. AGC charge current	V9-11 = 0mVRMS,V16 = 2.5V	-16.5	-12.5	-8.5	μA
I16	Max. AGC discharge current	V9-11 = 50mVRMS,V16 = 2.5V	0.8	1.25	1.68	mA
AGC pin diode driver output
I8	AGC OUT, current min.	V9-11 = 0mVRMS, V8 = 2.5V		12		μA
I8	AGC OUT, current max.	V9-11 = 50 mVRMS, V8 = 2.5V	-22	-17	-12	mA
I/Q Mixer1 (10.7MHz)
RIN	Input resistance	differential		10		kΩ
CIN	Input capacitance	differential		4		pF
ROUT	Output resistance	differential	100			kΩ
V9,11	Input DC bias		2.2	2.5	2.8	V
gm	Conversion			17		ms
	transconductance
F	Noise figure	400Ω generator resistance		3		dB
CP1dB	1dB compression point	referred to diff. mixer input		100		dBμV
IIP3	3rd order intermodulation			122		dBμV
IQP	I/Q phase adjust	PH	-7		+8	°
IRR	Image rejection ratio	ratio wanted/image	30	40		dB
IRR	Image rejection ratio	with phase adjust	40	46		dB
IF1 Amplifier1 +2 (10.7MHz)
G2	Gain		5	6	7	dB
G1min	Min. gain	IFG1	7.5	9	10.5	dB
G1max	Max. gain	IFG1	16	18	20	dB

13/76

Electrical specifications	TDA7540N

Table 6. FM section electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, fRF = 98MHz, dev= 40kHz, fMOD = 1kHz, fXtal = 10.25MHz, in application circuit, unless

otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
RIN	Input resistance		260	330	400	W
ROUT	Output resistance		260	330	400	W
CP1dB	1dB compression point	referred to 330Ωinput		105		dBμV
IIP3	3rd order Intermodulation	ref. to 330Ωinput, 9dB gain		126		dBμV
Mixer2 (450kHz)
RIN	Input impedance		260	330	400	Ω
V65	Max. input voltage			119		dBμV
V65	Limiting sensitivity	S/N = 20dB		28		dBμV
G	Mixer gain			18		dB
Limiter 1 (450kHz)
GLimiter	Gain			80		dB
Demodulator, audio output
THD		Dev.= 75kHz, V65= 10mVRMS			0.1	%
VMPX	MPX output signal	Dev.= 75kHz	400	500	600	mVRMS
ROUT	Output impedance			50		Ω
| V|min	DC offset fine adjust	DEM, MENA=1		8.5		mV
| V|max	DC offset fine adjust	DEM, MENA=1		264		mV
S/N		Dev.= 40kHz,V65 = 10mVRMS		76		dB
VMPXW	MPXW output signal	Dev.= 75kHz	280	350	420	mVRMS

Quality detection

S-meter, unweighted fieldstrength

V65	Min. input voltage MIX2				30		dBμV
V22	Fieldstrength output	V65	= 20dBµV		0.1		V
V22	Fieldstrength output	V65	= 80dBµV, SMSL = 0	2.2	2.6	3.0	V
V22	Voltage per decade	SMSL = 0		0.8	1	1.2	V
V22	Voltage per decade	SMSL = 1		1.2	1.5	1.8	V
V22	S-meter offset	SL, SMSL=1		-15		15	dB
ROUT	Output impedance			280	400	520	Ω
TK	Coefficient temperature				0		ppm/K

14/76

TDA7540N	Electrical specifications

Table 6. FM section electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, fRF = 98MHz, dev= 40kHz, fMOD = 1kHz, fXtal = 10.25MHz, in application circuit, unless

otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
		Adjacent channel gain
Gmin	Gain minimum	ACG=0		32		dB
Gmax	Gain maximum	ACG=1		38		dB
		Adjacent channel filter
fHP	-3dB frequency highpass	ACF=0		100		kHz
fBP	Centre frequency	ACF=1		100		kHz
f-20dB	Attenuation 20dB			70		kHz
		Adjacent channel output
V23	Output voltage low			0.1		V
V23	Output voltage high			4.9		V
ROUT	Output resistance		3.5	4.5	5.5	kΩ
		Multipath channel gain
Gmin	Gain minimum	MPG=0		12		dB
Gmax	Gain maximum	MPG=1		23		dB
		Multipath bandpass filter
fBP19	Centre frequency	MPF=0		19		kHz
fBP31	Centre frequency	MPF=1		31		kHz
Q	Quality factor		5	8	10
		Multipath output
V24	Output voltage low			0.1		V
V24	Output voltage high			4.9		V
ROUT	Output resistance			3		kΩ
ISS (intelligent Selectivity System)
		Filter 450kHz
fcentre	Centre frequency	fREF_intern = 450kHz		450		kHz
BW 3dB	Bandwidth, -3dB	ISS80 = 1	70	80	90	kHz
BW 20dB	Bandwidth, -20dB	ISS80 = 1	132	150	168	kHz
BW 3dB	Bandwidth, -3dB	ISS80 = 0	106	120	135	kHz
BW 20dB	Bandwidth, -20dB	ISS80 = 0	220	250	280	kHz
BW 3dB	Bandwidth weather band	ISS30 = 1	20	30	40	kHz
BW 20dB	-20dB weather band	ISS30 = 1	56	80	104	kHz

15/76

Electrical specifications	TDA7540N

Table 6. FM section electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, fRF = 98MHz, dev= 40kHz, fMOD = 1kHz, fXtal = 10.25MHz, in application circuit, unless

otherwise specified).

Symbol	Parameter		Test conditions		Min.	Typ.	Max.	Unit
	Adjacent channel ISS filter threshold
VNTH	Internal low threshold		ACNTH			0		V
VNTH	Internal high threshold		ACNTH		0.24	0.3	0.36	V
VWTH	Internal low threshold		ACWTH		0.2	0.25	0.3	V
VWTH	Internal high threshold		ACWTH		0.76	0.95	1.14	V
			Multipath threshold
VTHMP	Internal low threshold		MPTH		0.40	0.50	0.60	V
VTHMP	Internal high threshold		MPTH		1.0	1.25	1.5	V
			ISS filter time constant
I27,I28	Charge current low mid		TISS, ISSCTL = 1		-96	-74	-54	μA
I27,I28	Charge current high mid		TISS, ISSCTL = 1			-60		μA
I27,I28	Charge current low narrow		TISS, ISSCTL = 1		-165	-124	-87	μA
I27,I28	Charge current high narrow		TISS, ISSCTL = 1			-110		μA
I27,I28	Discharge current low		TISS, ISSCTL = 0		-0.4	1	2.0	μA
I27,I28	Discharge current high		TISS, ISSCTL = 0		10	15	20	μA
V27,V28	Low voltage		ISSCTL = 0			0.1	0.2	V
V27,V28	High voltage		ISSCTL = 1		4.6	4.9		V
		ISS filter switch threshold
V27,V28	Threshold ISS on		ISSCTL = 0			3		V
V27,V28	Threshold ISS off		ISSCTL = 0			1		V
V27,V28	Threshold ISS narrow on		ISSCTL = 0			4		V
V27,V28	Threshold ISS narrow off		ISSCTL = 0			2		V
I3	Charge current low		TDEV		-20	-32	-40	μA
I3	Charge current high		TDEV		-30	-39	-48	μA
I3	Discharge current low		TDEV		0.5	1	1.5	μA
I3	Discharge current high		TDEV		5.5	8	10.5	μA
DEVWTH	Internal low threshold		DWTH			30		kHz
DEVWTH	Internal high threshold		DWTH			75		kHz
RATIOmin	Referred to threshold		DTH			1
RATIOmax	Referred to threshold		DTH			1.5

16/76

TDA7540N	Electrical specifications

Table 6. FM section electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, fRF = 98MHz, dev= 40kHz, fMOD = 1kHz, fXtal = 10.25MHz, in application circuit, unless

otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
Softmute
VANT	Upper startpoint	SMTH, SMD, SLOPE = 0		10		dBμV
VANT	lower startpoint	SMTH, SMD, SLOPE = 0		3		dBμV
aSMmin	Min. softmute depth	SMD, SLOPE = 0, SMTHUpper		18		dB
aSMmax	Max. softmute depth	SMD, SLOPE = 0, SMTHUpper		36		dB
aSMTHISS	Mute depth threshold for ISS	SMCTH	0.2	1	2	dB
	filter on
VACTH	Internal AC mute threshold	ACM	60		340	mV
aSMAC	AC mute depth	ACMD	4		10	dB
I49	Charge current		-65	-47.5	-30	μA
I49	Discharge current		1.5	2.5	4.0	μA
S/N MPX
		VANT = 60dBμV,
(S+N)/N		dev.= 40kHz,LP=15KHz	66	69		dB
		deemphasis t = 50μs

3.3.3AM section

Table 7. AM section electrical characteristics

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, fRF = 98MHz, m= 30%, fMOD = 400kHz, fXtal = 10.25MHz, in application circuit, unless

otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
Global
VANT_us	Usable sensitivity	(S+N)/N = 26 dB	25	19		dBµV
VANT	IF2 AGC Range	Ref.: VINRF = 60dBμV,	50	52		dB
(S+N)/N	Signal to Noise Ratio	Ref.: VINRF = 60dBμV	50	55		dB
aIF	IF rejection	Ref: VINRF = 60dBµV,	70	80		dB
		IF = 10.7MHz
fAF	Frequency response	Ref.: VINRF = 60dBµV,		3.6		kHz
		VAF = -3 dB
		VINRF = 60dBµV, m = 0.8		0.5
THD	Total Harmonic Distortion	m = 0.3		0.3		%
		VINRF = 120dBµV, m = 0.8		1.0
		m = 0.3		0.3
V53	AF output level	VINRF = 60dBµV	160	180	200	mVRMS

17/76

Electrical specifications	TDA7540N

Table 7. AM section electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, fRF = 98MHz, m= 30%, fMOD = 400kHz, fXtal = 10.25MHz, in application circuit, unless

otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
V24	IF output level	VINRF = 60dBµV, m=off		190		mVRMS
V4	Min. RF AGC threshold	WAGC		97		dBμV
	Max. RF AGC threshold			109		dBμV
V71	Min. IF AGC threshold	WAGC		96.5		dBμV
	Max. IF AGC threshold			109		dBμV
V71	Min. DAGC threshold	DAGC		74		dBμV
	Max. DAGC threshold			96		dBμV
|I78max|	AGC2 charge current	seek	80	100	120	μA
CCR	Charge current ratio	seek/seek off		30
AGC voltage driver output
V6	Max. AGC output voltage		3.5			V
V6	Min. AGC output voltage				0.5	V
| I6 |	AGC current			100		μA
AGC pin diode driver output
I7	AGC driver current		-2.6	-2	-1.4	mA
AM Mixer1 (10.7MHz)
RIN	Input resistance	differential	100			kΩ
CIN	Input capacitance	differential		4		pF
ROUT	Output impedance	differential	100			kΩ
CP1dB	1dB compression point	referred to diff. mixer input		112		dBμV
IIP3	3rd order intermodulation			132		dBμV
F	Noise figure			8		dB
A	Gain			26		dB
Cmin	Min. capacitance step	IF1T		0.55		pF
Cmax	Max. capacitance	IF1T		8.25		pF
C1-80		IF1T		2		pF
AM Mixer2 (450kHz)
R71	Input resistance		260	330	400	W
C71	Input capacitance			2.5		pF
CP1dB	1dB compression point	referred to diff. mixer input		120		dBμV
IIP3	3rd order intermodulation			132		dBμV
F	Noise figure			12		dB

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TDA7540N	Electrical specifications

Table 7. AM section electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, fRF = 98MHz, m= 30%, fMOD = 400kHz, fXtal = 10.25MHz, in application circuit, unless

otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
A	Max. gain	Mixer2 tank output		34		dB
A	Gain control range			20		dB
Cmin	Min. cap step	IF2T		1.6		pF
Cmax	Max. cap	IF2T		24		pF
C62-63		IF2T		2		pF
IF noise blanking
tbl	Min. blanking time			8		μs
tbl	Max. blanking time			17		μs
Vth	Min internal threshold		10	12.5	15	mV
Vth	Max. internal threshold		150	187.5	225	mV
Vthstep	Threshold step		10	12.5	15	mV
Vdesth	Min. desensitivity threshold		2.9	3.2	3.5	V
Vdesth	Max. desensitivity threshold		3.6	4	4.4	V

3.3.4Stereodecoder

Table 8. Stereodecoder electrical characteristics

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, VMPX = 500mVrms mono, f = 1kHz, deemphasis = 50µs, fXtal = 10.25MHz, in application

circuit, unless otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
Stereodecoder
Vin	MPX input level	STD Gain = 2.5 dB		0.5	0.93	Vrms
Rin	Input resistance		70	100	130	kΩ
Gmin	Min. Stereodecoder gain		-0.5	0	0.5	dB
Gmax	Max. Stereodecoder gain		3.15	3.75	4.35	dB
Gstep	Stereodecoder gain step		1	1.25	1.5	dB
	resolution
SVRR	Supply voltage ripple rejection	Vripple = 100mV, f = 1kHz	54	60		dB
a	Max. channel separation	VMPX = 500mVrms stereo		50		dB
		only L/R
THD	Total harmonic distortion			0.02	0.3	%
(S+N)/N	Signal plus Noise to Noise	A-weighted, 19kHz notch		85		dB
	ratio

19/76

Electrical specifications	TDA7540N

Table 8. Stereodecoder electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, VMPX = 500mVrms mono, f = 1kHz, deemphasis = 50µs, fXtal = 10.25MHz, in application

circuit, unless otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
Vpuafs	Pull up voltage for AFS pin		3.1	3.3	3.5	V
Rpuafs	Pull up resistor for AFS pin			25		kΩ
VTH1	1. threshold for AFS PIN		2.2	2.4	2.6	V
VTH2	2. threshold for AFS PIN		0.6	0.8	1.0	V
Mono/stereo-switch
VPTHST1	Pilot threshold voltage	for Mono->Stereo, PTH = 1	6	10	15	mVrms
VPTHST0	Pilot threshold voltage	for Mono->Stereo, PTH = 0	10	14	19	mVrms
VPTHMO1	Pilot threshold voltage	for Stereo->Mono, PTH = 1	4	8	12	mVrms
VPTHMO0	Pilot threshold voltage	for Stereo->Mono, PTH = 0	7	12	16	mVrms
19kHz PLL
flock	PLL lock range	Pilot magnitude	18.9		19.1	kHz
		20 mVrms = 4%
DP	Pilot deviation	Pilot frequency 19kHz	4		30	%
Deemphasisand highcut
tHC50	Deemphasis time constant	DEEMP = 0, DESFT = 1		50		μs
		VLEVEL >> VHCH
tHC75	Deemphasis time constant	DEEMP = 1, DESFT = 1		75		μs
		VLEVEL >> VHCH
tHC25	Deemphasis time constant	DEEMP = 0, DESFT = 0		25		μs
		VLEVEL >> VHCH
tHC37	Deemphasis time constant	DEEMP = 1, DESFT = 0		37.5		μs
		VLEVEL >> VHCH
tHC50	Highcut time constant	DEEMP = 0, DESFT = 1		150		μs
		VLEVEL << VHCL
tHC75	Highcut time constant	DEEMP= 1, DESFT = 1		225		μs
		VLEVEL << VHCL
FAMCMin	Min. AM corner frequency	DEEMP = 0, DESFT = 1		1.06		kHz
		AMCF
FAMCMin	Max. AM corner frequency	DEEMP = 0, DESFT = 1		3.18		kHz
		AMCF
Stereoblendand highcut-control
LGmin	Min. level gain	LG	-0.5	0	0.5	dB
LGmax	Max. level gain	LG	4.0	4.7	5.2	dB
LGstep	Level gain step resolution	LG	0.4	0.67	0.9	dB

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TDA7540N	Electrical specifications

Table 8. Stereodecoder electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, VMPX = 500mVrms mono, f = 1kHz, deemphasis = 50µs, fXtal = 10.25MHz, in application

circuit, unless otherwise specified).

Symbol			Parameter			Test conditions	Min.	Typ.	Max.	Unit
VSBLmin			Min. voltage for mono	SBC				29	33	%VREF1
VSBLmax			Max. voltage for mono	SBC			54	58		%VREF1
VSBLstep			Step resolution	SBC				4.2		%VREF1
VHCHmin			Min. voltage for no highcut	VHCH				42	46	%VREF1
VHCHmax			Max. Voltage for no highcut	VHCH			61	66		%VREF1
VHCHstep			Step resolution	VHCH				8		%VREF1
VHCLmin			Min. voltage for full high cut	VHCL, MAXHC = 11				11	15	%VHCH
VHCLmax			Max. voltage for full high cut	VHCL, MAXHC = 11			31	33		%VHCH
VHCLstep			Step resolution	VHCL, MAXHC = 11				7.3		%VHCH
Carrier and harmonic suppression at the output
		a19	Pilot signal f=19kHz	Vpilot = 50mVrms				50		dB
		a38	Subcarrier f=38kHz					75		dB
		a57	Subcarrier f=57kHz					62		dB
		a76	Subcarrier f=76kHz					90		dB
Intermodulation(1)
		a2	fmod=10kHz, fspur=1kHz					65		dB
		a3	fmod=13kHz, fspur=1kHz					75		dB
Traffic radio(2)
		a57	Signal f=57kHz					70		dB
SCA - Subsidiary communications authorization(3)
		a67	Signal f=67kHz					75		dB
ACI - adjacent channel interference(4)
a114			Signal f=114kHz					95		dB
a190			Signal f=190kHz					84		dB
FM noise blanker
V		TRMIN	Min. trigger threshold (5)	V	PEAK	=0.8V, NBLTH		147		mV
										OP
V	TRMAX		Max. trigger threshold (5)	V	PEAK	=0.8V, NBLTH		280		mV
										OP
VTRSTEP			Trigger threshold step0)					19		mVOP
VTRNOISE			Min. noise controlled trigger	VPEAK=1.5V, NBCTH				450		mVOP
			(5)
			threshold
VTRNOISE			Max. noise controlled	VPEAK=1.5V, NBCTH				1200		mVOP
			trigger threshold(5)

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Electrical specifications	TDA7540N

Table 8. Stereodecoder electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, VMPX = 500mVrms mono, f = 1kHz, deemphasis = 50µs, fXtal = 10.25MHz, in application

circuit, unless otherwise specified).

	Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
	VPEAK	Peak voltage	NBRR = 00, VMPX=0mV	0.5	0.8	1.0	V
	VPEAK	Peak voltage	VMPX=50mV, f=150kHz	1.6	1.9	2.1	V
	VPEAK	Peak voltage	VMPX=200mV, f=150kHz	2.2	2.5	2.7	V
	VPEAKDEV	Min. deviation dependent	VMPX=500mV, NBDTH = 11	0.5	0.8 (off)	1.0	VOP
		peak voltage
	VPEAKDEV	Max. deviation dependent	VMPX=500mV, NBDTH= 00	1.7	2.0	2.2	VOP
		peak voltage
	VPEAKFS	Min. fieldstrength controlled	VMPX=0mV, VLEVEL<< VSBL	0.5	0.8 (off)	1.0	V
		peak voltage	(fully mono), NBFS = 11
	VPEAKFS	Max. fieldstrength controlled	VMPX=0mV, VLEVEL<< VSBL	1.7	2.0	2.2	V
		peak voltage	(fully mono), NBFS = 00
	TS	Min. blanking time	Signal HOLDN in testmode,		22		μs
			NBT
	TS	Max. blanking time	Signal HOLDN in testmode,		38		μs
			NBT
	SRPEAK	Noise rectifier charge	Signal PEAK in testmode,		10		mV/μs
			NBPC=0
	SRPEAK	Noise rectifier charge	Signal PEAK in testmode,		20		mV/μs
			NBPC=1
		Noise rectifier discharge	Signal PEAK in testmode,
	VRECTADJ		NBRR=00, NBSMP=0,		0.3		V/ms
		adjustment
			MPPC=0
		Noise rectifier discharge	Signal PEAK in testmode,
	VRECTADJ		NBRR=01, NBSMP=0,		0.8		V/ms
		adjustment
			MPPC=0
		Noise rectifier discharge	Signal PEAK in testmode,
	VRECTADJ		NBRR=10, NBSMP=0,		1.3		V/ms
		adjustment
			MPPC=0
		Noise rectifier discharge	Signal PEAK in testmode,
	VRECTADJ		NBRR=11, NBSMP=0,		2.0		V/ms
		adjustment
			MPPC=0
		Noise rectifier adjustment by	Signal PEAK in testmode,
	VADJMP		VMPTC=1V, NBSMP=0,		2.5		V/ms
		multipath
			MPPC=1, NBRR=01
		Noise rectifier adjustment by	Signal PEAK in testmode,
	VADJMP		VMPTC=1V,, NBSMP=1,		3.3		V/ms
		strong multipath influence
			MPPC=0, NBRR=01
		Noise rectifier adjustment by	Signal PEAK in testmode,
	VADJMP	multipath and strong multipath	VMPTC=1V,, NBSMP=1,		4.5		V/ms
		influence	MPPC=1A, NBRR=01

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TDA7540N	Electrical specifications

Table 8. Stereodecoder electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, VMPX = 500mVrms mono, f = 1kHz, deemphasis = 50µs, fXtal = 10.25MHz, in application

circuit, unless otherwise specified).

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
GAMdelay	AM delay filter attenuation	f = 2.2kHz		2.0		dB
Multipath detector
fCMP	Center frequency of multipath-	stereo decoder locked on pilot		19		kHz
	bandpass	tone
GBPMP	Min. band pass gain	MPBPG	4	6	8	dB
GBPMP	Max. band pass gain	MPBPG	10	12	14	dB
GRECTMP	Min. rectifier gain	MPRG	-1	0	1	dB
GRECTMP	Max. rectifier gain	MPRG	4.5	7.6	9.5	dB
ICHMP	Rectifier charge current	MPCC = 0	0.5	0.8	1.2	μA
ICHMP	Rectifier charge current	MPCC = 1	0.2	0.4	0.6	μA
IDISMP	Rectifier discharge current		0.3	0.6	0.8	mA
Quality detector
a	Min. MP influence factor	QDC	0.5	0.6	0.7
a	Max. MP influence factor	QDC	0.9	1.05	1.2
A	Min. noise influence factor	QNG		6		dB
A	Max. noise influence factor	QNG		15		dB

1. Intermodulation Suppression

a2 = VO(signal,@1KHz) / VO(spurious, @1KHz) ; fs = (2x10KHz) - 19KHz a3 = 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

a57(V,W,F) = VO(signal,@1KHz) / VO(spurious, @1KHz+/-23KHz)

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 )

a67 = VO(signal,@1KHz) / VO(spurious, @9KHz) ; fs = (2x38KHz) - 67KHz

measured with: 81% mono signal; 9% pilot signal; fm=1kHz; 10%SCA – sub carrier ( fS = 67kHz, unmodulated ). 4. ACI (Adjacent Channel Interference )

a114 = VO(signal,@1KHz) / VO(spurious, @4KHz) ; fs = 110KHz - (3x38KHz) a190 = 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).

5.All thresholds are measured inTestmode at the quality output. The thresholds are calculated by VNBTH - VPEAK

VPEAK is adjusted by applying a 150kHz sinewave at MPXIN.

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