ST TDA7541 User Manual

TDA7541

AM/FM car-radio tuner IC with stereo decoder and intelligent selectivity system

Features

■FM part

–AGC generation by RF and IF detection

–I/Q mixer for 1st IF 10.7 MHz with image rejection

–Mixer for 2nd IF 450 kHz

–Internal 450 kHz band pass filter with bandwidth control by ISS

–Fully integrated FM demodulator with noise cancellation

■AM part

–Wide and narrow AGC generation

–Mixer for 1st IF 10.7 MHz, AM upconversion

–Mixer for 2nd IF 450 kHz

–Integrated AM-demodulator

–AM IF noise blanking

■Stereo decoder

–PLL with adjustment free, fully integrated VCO

–Automatic pilot dependent MONO/STEREO switching

–Programmable ROLL-OFF compensation

–High cut and stereo blend-characteristics programmable

–Dedicated RDS mute

–Audio noise blanker

■Additional features

–VCO for world tuning range

Table 1. Device summary

LQFP64

–High performance fast PLL for RDSSystem

–IF counter for FM and AM with search stop signal

–Quality detector for level, deviation, adjacent channel and multipath

–ISS (Intelligent selectivity system) for cancellation of adjacent channel and noise influences

–Adjacent channel mute

–Fully electronic alignment

–Independend weather band input

–All functions I2C bus controlled

Description

The TDA7541 is a high performance tuner circuit with stereo decoder for AM/FM car radio. It contains a mixer, IF amplifier, demodulator for AM and FM, stereo decoder, quality detection, ISS filter and PLL synthesizer with IF counter on a single chip. Use of BICMOS technology allows the implementation of several tuning functions and a minimum of external components.

Order code	Package	Packing
TDA7541	LQFP64 (10 x 10 x 1.4 mm)	Tray
TDA7541TR	LQFP64 (10 x 10 x 1.4 mm)	Tape and reel
TDA7541W	LQFP64 (14 x 14 x 1.4 mm)	Tray
TDA7541WTR	LQFP64 (14 x 14 x 1.4 mm)	Tape and reel
June 2009	Doc ID 13686 Rev 4	1/75
		www.st.com

Contents	TDA7541

Contents

1	Block circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 6
2	Pin connection and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 7
	2.1	Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	2.2	Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
3	Electrical specifications and characteristics . . . . . . . . . . . . . . . . . . . .		10

3.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3.1 Globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3.2 FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3.3 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.3.4 Stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.3.5 PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4	Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		26
	4.1	FM part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26

4.1.1 Mixer 1 AGC and IF amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1.2 Mixer 2, limiter, FM demodulator and spike cancellation . . . . . . . . . . . . 26 4.1.3 Quality detection and ISS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1.4 Block diagram quality detection principle . . . . . . . . . . . . . . . . . . . . . . . . 29 4.1.5 Weak signal mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.1.6 Weather band input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4.2 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.3 Stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.3.1 Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.3.2 Noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 4.3.3 Functional description of the multipath detector . . . . . . . . . . . . . . . . . . 36 4.3.4 Quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4.3.5 AFS control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4.4	PLL and IF counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		37
	4.4.1	PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	37
	4.4.2	IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	38

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TDA7541			Contents
	4.5	I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . 38
5	Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . 41

5.1 Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.2 Control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 5.3 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

6	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		66
Appendix A		Block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	67
Appendix B		Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	73
7	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		74

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List of tables	TDA7541

List of tables

Table 1.	Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 1
Table 2.	Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 7
Table 3.	Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
Table 4.	Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
Table 5.	Globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
Table 6.	FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
Table 7.	AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
Table 8.	Stereo decoder section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	20
Table 9.	PLL section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	24
Table 10.	ISS filter control by I2C bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
Table 11.	Internal ISS control signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
Table 12.	ISS control modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	30
Table 13.	Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	41
Table 14.	I2C control bit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	43
Table 15.	Subaddress description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	46
Table 16.	Addr 0 TPLL charge pump control (0Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	46
Table 17.	Addr 1 TPLL Counter 1 (LSB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	47
Table 18.	Addr 2 TPLL Counter 2 (MSB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	47
Table 19.	Addr 3 TV(00h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	47
Table 20.	Addr 4 TV/IF Counter (FM ACh , AM 1Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	48
Table 21.	Addr 5 TPLL Divider (FM 3Dh , AM 2Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	49
Table 22.	Addr 6 AGC (FM 06h, AM 2Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	50
Table 23.	Addr 7 Quality AC (FM 50h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	51
Table 24.	Addr 8 Quality ACM/MP (FM 6Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	52
Table 25.	Addr 9 Quality Dev (FM 49h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	53
Table 26.	Addr 10 Quality MUX/FSU (FM 0Eh , AM 0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	54
Table 27.	Addr 11 Weak Signal Mute (FM A8h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	54
Table 28.	Addr 12 AM IF NB (AM B1h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	55
Table 29.	Addr 13 XTAL adjust(80h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	55
Table 30.	Addr 14 IF2 adjust (FM E8h, AM 08h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	56
Table 31.	Addr 15 IQ adjust / Switch (FM E7h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	57
Table 32.	Addr 16 FM keying AGC (FM 1Dh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	58
Table 33.	Addr 17 Roll off / Level gain (77h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	59
Table 34.	Addr 18 SD Stereoblend / AM corner frequency (0Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . .	60
Table 35.	Addr 19 SD High cut (2Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	61
Table 36.	Addr 20 SD MP (FM 97h, AM 3Fh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	62
Table 37.	Addr 21 SD Quality (FFM 7Ah, AM FAh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	63
Table 38.	Addr 22 SD NB I (FM 05h, AM 04h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	64
Table 39.	Addr 23 SD NB II (FM E2h, AM C2h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	65
Table 40.	Addr 24, 26, 27, 28, 29 testing (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	65
Table 41.	Addr 25 Testing (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	65
Table 42.	Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	74

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TDA7541	List of figures

List of figures

Figure 1. Block circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2. Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 3. Programming of HC filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Figure 4. Programming of stereo blend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Figure 5. Adaptive threshold control of noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Figure 6. Stereo blend controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 7. Deviation controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 8. LQFP64 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Figure 9. Block diagram FM part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Figure 10. Block diagram VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Figure 11. Block diagram ISS function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Figure 12. Block diagram AM path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Figure 13. Block diagram stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Figure 14. Block diagram audio noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Figure 15. Block diagram multi path detection for stereo decoder. . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Figure 16. Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

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Block circuit diagram	TDA7541

1 Block circuit diagram

Figure 1. Block circuit diagram

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TDA7541	Pin connection and pin description

2 Pin connection and pin description

2.1Pin connections

Figure 2. Pin connections (top view)

				MIX1OUT			MIX1REF			GNDIF			IF1AMPIN			VCCIF1			IF1AMPOUT			IF1REF			AMAGC2TC			MIX2IN			MIX2INREF			AMRFAGCTC			MIX2OUT			MIX2REF			VCC2			MIX2AMPOUT			GNDVCC2
	64					63			62			61			60			59			58			57			56			55			54			53			52			51			50			49
VCCMIX1			1																																													48					VREF1
DEVTC			2																																													47					AMIF2IN
AMMIX1IN			3																																													46					GNDDEM
AMRFAGCOUT			4																																													45					FMREFDEMC
WB			5																																													44					AMIF2REF
AMMIX1RAF			6																																													43					MPXOUT
AMPINDR			7																																													42					MUTETC
FMMIX1IN1			8																																													41					MPXIN
GNDRF			9																																													40					AMREFDEMC
FMMIX1IN2			10																																													39					MPTC
TV			11																																													38					GNDSTD
FMPINDR			12																																													37					FSWO
FMAGCTC			13																																													36					VCC1
VCOB			14																																													35					R
VCOE			15																																													34					L
VCCVCO			16																																													33					GNDVCC1
	17					18			19			20			21 22						23			24			25			26			27			28			29			30			31			32
				GNDVCO			LPOUT			VREF2			LPF			LPHC			SW			MUX			SSTOP			SDA			SCL			FSU			FSTC			XTALG			ISSTC1			ISSTC2			XTALD

2.2Pin description

Table 2.	Pin description
Pin No.		Pin name	Function
1		VCCMIX1	Mixer1 Supply
2		DEVTC	Deviation Detector Time Constant
3		AMMIX1IN	AM Mixer1 Input
4		AMRFAGCOUT	AM RF AGC Voltage Output

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Pin connection and pin description				TDA7541
	Table 2.	Pin description (continued)
	Pin No.		Pin name	Function
	5		WB	Weather Band Input
	6		AMMIX1REF	AM Mixer1 Reference
	7		AMPINDR	AM Pin Diode Driver Output
	8		FMMIX1IN1	FM Mixer1 Input1
	9		GNDRF	RF Ground
	10		FMMIX1IN2	FM Mixer1 Input2
	11		TV	Tuning Voltage Preselection
	12		FMPINDR	FM Pin Diode Driver Output
	13		FMAGCTC	FM AGC Time Constant
	14		VCOB	VCO Input Base
	15		VCOE	VCO Output Emitter
	16		VCCVCO	VCO Supply
	17		GNDVCO	VCO Ground
	18		LPOUT	OpAmp Output to PLL Loop Filter
	19		VREF2	Voltage Reference for PLL OpAmp
	20		LPF	OpAmp Input to PLL Loop Filter
	21		LPHC	High Current PLL Loop Filter Input
	22		SW	Free Programmable Switch Output
	23		MUX	Multiplexer Output
	24		SSTOP	Search Stop Output
	25		SDA	I2C Bus Data
	26		SCL	I2C Bus Clock
	27		FSU	Unweighted Field Strength Output
	28		FSTC	S-meter Filtering Capacitor
	29		XTALG	Xtal Oscillator to MOS Gate
	30		ISSTC1	ISS Filter Time Constant1 (slow)
	31		ISSTC2	ISS Filter Time Constant2 (fast)
	32		XTALD	Xtal Oscillator to MOS Drain
	33		GNDVCC1	Digital Ground
	34		L	Stereo Decoder Output Left
	35		R	Stereo Decoder Output Right
	36		VCC1	Digital Supply
	37		FSWO	Weighted Field Strength Output
	38		GNDSTD	Stereo Decoder Ground
	39		MPTC	Multipath Detector Time Constant

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TDA7541				Pin connection and pin description
	Table 2.	Pin description (continued)
	Pin No.		Pin name	Function
	40		AMREFDEMC	AM Demodulator Reference
	41		MPXIN	Stereo Decoder Input
	42		MUTETC	Weak Signal Mute Time Constant
	43		MPXOUT	AM Audio / MPX Output
	44		AMIF2REF	AM IF2 Amplifier Reference Voltage
	45		FMREFDEMC	FM Demodulator Reference
	46		GNDDEM	FM Demodulator Ground
	47		AMIF2IN	AM IF2 Amplifier Input
	48		VREF1	5V Reference
	49		GNDVCC2	Analog Ground
	50		MIX2AMPOUT	MIXER2 Amplifier Output
	51		VCC2	Analog Supply
	52		MIX2REF	Mixer2 Reference
	53		MIX2OUT	Mixer2 Output
	54		AMRFAGCTC	AM RF AGC Time Constant
	55		MIX2INREF	Mixer2 Input Reference
	56		MIX2IN	Mixer2 Input
	57		AMAGC2TC	AM AGC2 Time Constant
	58		IF1REF	IF1 Amplifier Reference
	59		IF1AMPOUT	IF1 Amplifier Output
	60		VCCIF1	IF1 Supply
	61		IF1AMPIN	IF1 Amplifier Input
	62		GNDIF1	IF1 Ground
	63		MIX1REF	Mixer1 Reference
	64		MIX1OUT	Mixer1 Output

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Electrical specifications and characteristics	TDA7541

3 Electrical specifications and characteristics

3.1Thermal data

Table 3.	Thermal data
Symbol	Parameter		Value	Unit
RTH(j-amb)	Thermal resistance junction to ambient	Max.	70	°C/W

3.2Absolute maximum ratings

Table 4.	Absolute maximum ratings
Symbol		Parameter	Conditions	Value	Unit
VS		Supply voltage	-	9.5	V
Tamb		Ambient temperature	-	-40 to 85	°C
Tstg		Storage temperature	-	-55 to +150	°C
			Human Body Model	2	kV
VESD		ESD withstand voltage	Machine Model	100	V
			Charged Device Model	300	V

3.3Electrical characteristics

3.3.1Globals

Tamb = 25 °C, VCC1 = VCC2 = VCCMIX1 = VCCVCO = VCCIF = 8.5 V, fXtal = 10.25 MHz, in application circuit, unless otherwise specified.

Table 5.		Globals
Item		Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
1. Supply
1.1		VCC1	Digital supply voltage	-	7.7	8.5	9	V
1.2		VCC2	Analog supply voltage	-	7.7	8.5	9	V
1.3		VCCVCO	VCO supply voltage	-	7.7	8.5	9	V
1.4		VCCMIX1	Mixer1 supply voltage	-	7.7	8.5	9	V
1.5		VCCIF	IF1 Supply Voltage	-	7.7	8.5	9	V
1.6		ICC1	Supply current	FM ON	-	19	23	mA
1.7		ICC1	Supply current	AM ON	-	21	25	mA
1.8		ICC2	Supply current	FM ON	-	48	58	mA
1.9		ICC2	Supply current	AM ON	-	37	44	mA

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TDA7541				Electrical specifications and characteristics
Table 5.		Globals (continued)
Item		Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
1.10		ICCVCO	Supply current	-	-	12	15	mA
1.11		ICCMIX1	Supply current	FM ON	-	32	40	mA
1.12		ICCMIX1	Supply current	AM ON	-	20	24	mA
1.13		ICCIF	Supply current	-	-	4	5	mA
2. Reference voltages
2.1		VREF1	Internal reference voltage	IREF1 = 0 mA	4.8	5	5.2	V
2.2		VREF2	Internal reference voltage	IREF2 = 0 mA	2.4	2.5	2.6	V
3. I2C bus interface
3.1		fSCL	Clock frequency	-	-	-	400	kHz
3.2		VIL	Input low voltage	-	-	-	1	V
3.3		VIH	Input high voltage	-	3	-	-	V
3.4		IIN	Input current	-	-5	-	5	µA
3.5		VO	Output acknowledge voltage	IO = 1.6mA	-	-	0.4	V

3.3.2FM section

Tamb = 25 °C, VCC1 = VCC2 = VCCMIX1 = VCCVCO = VCCIF = 8.5 V, fXtal = 10.25 MHz,

fRF = 98 MHz, dev = 40 kHz, fMod = 1 kHz, in application circuit, unless otherwise specified.

Table 6.		FM section
Item		Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
4. Wide band RF AGC
4.1		V8-10	Lower threshold start	V13 = 2.5 V, RFK “0”	-	79	-	dBμV
4.2		V8-10	Upper threshold start	V13 = 2.5 V, RFK”0”	-	93	-	dBμV
4.3		V8-10	Control range RF KAGC	KAGC”000”, RFAGC”00”,	5	8	11	-
				V37 = 3.0….3.7 V, RFK”1”
5. Narrow band IF & keying AGC
5.1		V61	Lower threshold start	KAGC = off, V8-10 = 0 mVRMS	-	82	-	dBµV
5.2		V61	Upper threshold start	KAGC = off, V8-10 = 0 mVRMS	-	94	-	dBµV
5.3		V61	Max. IFAGC threshold	KAGC”000”,IFAGC”00”,	-	97	-	dBµV
			with KAGC	V37 = 3.0 V
5.4		V37	Start point KAGC	KAGC”000”,IFAGC”00”,	3.2	3.4	3.6	V
5.5		V61	Control range IF KAGC	KAGC”000”,IFAGC”00”,	12	15	18	dB
				V37 = 3.2….3.9 V
6. AGC time constant output
6.1		V13	Max. AGC output voltage	V8-10= 0 mVRMS	-	-	VREF1	V
							+VBE

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Electrical specifications and characteristics							TDA7541
Table 6.		FM section (continued)
Item		Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
6.2		V13	Min. AGC output voltage	V8-10 = 100 mVRMS	-	-	0.5	V
6.3		I13	Min. AGC charge current	V8-10= 0 mVRMS,V13 = 2.5 V	-33	-25	-17.5	µA
6.4		I13	Max. AGC discharge	V8-10 = 100 mVRMS,V13 = 2.5 V	1.7	2.5	3.3	mA
			current
7. AGC PIN diode driver output
7.1		I12	AGC OUT, current min.	V8-10 = 0 mVRMS, V12 = 2.5V	15	25	35	µA
7.2		I12	AGC OUT, current max.	V8-10 = 50 mVRMS, V12 = 2.5 V	-	-	-16	mA
8. FM I/Q Mixer1 (10.7 MHz)
8.1		RIN	Input resistance	Differential	8	10	12	kΩ
8.2		CIN	Input capacitance	Differential	-	4	-	pF
8.3		ROUT	Output resistance	-	530	660	790	Ω
8.4		V8,11	Input DC bias	-	2.2	2.5	2.8	V
8.5		G	Gain	Unloaded	20	22	24	dB
8.6		Gl	Gain	With 330 Ω load	14	16	18	dB
8.7		INOISE	Equivalent input noise	-	-	3	-	nV/√Hz
8.8		CP1dB	1dB compression point	Referred to diff. mixer input	-	100	-	dBµV
8.9		IIP3	3rd order intermodulation	-	-	119	-	dBµV
8.10		IQP	I/Q phase adjust	PH	-7	-	+8	DEG
8.11		IRR	Image rejection ratio	Ratio wanted/image	30	40	-	dB
8.12		IRR	Image rejection ratio	With phase adjust	40	46	-	dB
9. WB I/Q Mixer1 (10.7 MHz)
9.1		RIN	Input resistance	Single ended	7	10	13	kΩ
9.2		ROUT	Output resistance	-	530	660	790	Ω
9.3		V5	Input dc bias	-	2	2.3	2.6	V
9.4		G	Gain	unloaded	24	26	28	dB
9.5		INOISE	Equivalent Input noise	Source impedance 400 Ω	-	2.3	-	nV/√Hz
9.6		IIP3	3rd order intermodulation	-	-	113	-	dBµV
10. IF1 amplifier (10.7 MHz)
10.1		RIN	Input resistance	-	265	330	396	Ω
10.2		CIN	Input capacitance	-	-	2.5	-	pF
10.3		V61	DC input voltage	-	-	VCCIF1/3	-	V
10.4		ROUT	Output resistance	-	265	330	396	Ω
10.5		COUT	Output capacitance	-	-	2.5	-	pF
10.6		V59	DC output voltage	-	-	VCCIF1/2	-	V

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TDA7541				Electrical specifications and characteristics
Table 6.		FM section (continued)
Item		Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
10.7		Gmin	Min. gain	IFG	-	9	-	dB
10.8		Gmax	Max. gain	IFG	-	21	-	dB
10.9		INOISE	Equivalent input noise	Gmax , Rgen=330 Ω, RL=330 Ω,	-	3.2	-	nV/√Hz
			voltage	noise of Rgen not included
10.10		CP1dB	1 dB compression point	referred to 330 Ω input, Gmax	-	99	-	dBµV
10.11		IIP3	3rd order Intermodulation	referred to 330 Ω input, Gmax	-	130	-	dBµV
11. Mixer2 (450kHz)
11.1		RIN	Input resistance	Differential	240	300	360	Ω
11.2		CIN	Input capacitance	-	-	2.5	-	pF
11.3		V55.56	DC input voltage	-	3.7	4	4.3	V
11.4		ROUT	Output resistance	-	100	-	-	kΩ
11.5		COUT	Output capacitance	-	-	2.5	-	pF
11.6		V52,53	DC output voltage	-	3.7	4	4.3	V
11.7		gm	Conversion	WB Mode; referred to MIX2OUT	-	126	-	µA/V
			transconductance
11.8		G	Gain	FM Mode, referred to MIX2OUT	-	14	-	dB
11.9		Cstep	Min. cap. Step	IF2A	-	2.2	-	pF
11.10		Cmax	Max. cap.	IF2A	-	33	-	pF
			Equivalent input noise	Rgen = 330 Ω, IF2Q”10”				nV/√Hz
11.11		INOISE	voltage,		-	15	-
			including buffer mixer2	noise of Rgen not included
11.12		CP1dB	1dB compression point	referred to 330 Ω input ,IF2Q”10”	-	116	-	dBμV
11.13		IIP3	3rd order Intermodulation	referred to 330 Ω input ,IF2Q”10”	-	132	-	dBμV
12. Demodulator, audio output
12.1		THD	Total harmonic distortion	Dev.= 75 kHz, V56= 100 dBµV,	-	0.1	0.3	%
				IF2Q”11”
				V56 =100 dBµ, f = 40 KHz,
		aAM	AM suppression	fmod =1 kHz,	40	60	-	dB
				fmod =1 kHz@AM, m =0.3 %
12.2		VMPX	MPX output signal	Dev.= 75 kHz	440	500	560	mVRMS
12.3		ROUT	Output impedance	-	20	40	60	Ω
		RLOAD	Load resistance	-	10	-	-	kΩ
				f = 40 kHz, fmod =1 kHz,
			Signal plus noise-to-noise	V56 =100 dBµV,
12.4		(S+N)/N		Deemphasis = 50 µs,	70	-	-	dB
			ratio at MPXOUT	B = 200 Hz to 15 kHz
				ISSENA = 0

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Electrical specifications and characteristics								TDA7541
Table 6.		FM section (continued)
Item		Symbol	Parameter		Test conditions	Min.	Typ.	Max.	Unit
			Signal plus noise-to-noise	f = 1.5 kHz, fmod =1 kHz,
12.5		(S+N)/N		V56	=100 dBµV,	40	-	-	dB
			ratio	Deemphasis = 75 µs,
			In weatherband mode
				setting see Table 10
13. Quality detection
	Unweighted field strength (FSU) and weighted field strength
13.1		V37	DC output voltage	V56	= 20 dBμV, FMON=1,	-	2.5	-	V
				FSWO = OFF
13.2		V37	DC output voltage	V56	= 50 dBμV, FMON=1,	-	3	-	V
				FSWO = OFF
13.3		V37	DC output voltage	V56	= 70 dBμV, FMON=1,	-	3.5	-	V
				FSWO = OFF
13.4		V37	DC output voltage	V56	> 120 dBμV, FMON=1,	-	4.6	-	V
				FSWO = OFF
13.5		V37	Slope	-		-	25	-	mV/dB
13.6		V37	DC offset	-		-200		0	mV
13.7		ROUT	Output impedance	FSWO		17	23.5	30	kΩ
13.8		V27	DC output voltage	V56	= 20 dBμV, FMON=1,	-	0.1	0.4	V
				SL=”101”
13.9		V27	DC output voltage	V56	= 50 dBμV, FMON=1,	-	1	-	V
				SL=”101”
13.10		V27	DC output voltage	V56	= 70 dBμV, FMON=1,	-	2	-	V
				SL=”101”
13.11		V27	DC output voltage	V56	> 120 dBμV, FMON=1,	4	-	-	V
				SL=”101”
13.12		V27	Slope			-	50	-	mV/dB
13.13		ROUT	Output impedance	FSU		320	400	480	Ω
13.14		Rload	Load resistor	FSU		-	20	-	kΩ
13.15		V27	DC output voltage AM	V47	= 20 dBμV, FMON = 0,	-	0.1	0.3	V
				SL= ”010”
13.16		V27	DC output voltage AM	V47	= 40 dBμV, FMON = 0,	-	1.25	-	V
				SL= ”010”
13.17		V27	DC output voltage AM	V47	= 60 dBμV, FMON = 0,	-	3.0	-	V
				SL= ”010”
13.18		V27	DC output voltage AM	V47	> 100 dBμV, FMON = 0,	4.5	-	-	V
				SL= ”010”
13.19		V27	Slope AM	FMON=0		-	90	-	mV/dB
13.20		fLP	-3 dB frequency low pass	FMON=0		-	40	-	kHz
			AM

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TDA7541					Electrical specifications and characteristics
Table 6.		FM section (continued)
Item		Symbol	Parameter		Test conditions	Min.	Typ.	Max.	Unit
	Adjacent channel gain
13.21		GAC	Gain		-	-	32	-	dB
	Adjacent channel filter
13.22		fHP	-3 dB frequency highpass		ACF=0	-	100	-	kHz
13.23		f-20dB	Attenuation 20dB		-	-	70	-	kHz
13.24		fBP	Centre frequency		ACF=1	-	100	-	kHz
	Multipath channel gain
13.25		GMP	Gain		-	-	12	-	dB
	Multipath bandpass filter
13.26		fC	Centre frequency		-	-	19	-	kHz
13.27		Q	Quality factor		-	5	8	10	-
14. ISS (intelligent selectivity system) filter 450kHz
14.1		fcentre	Centre frequency		fREF_intern = 450 kHz	-	450	-	kHz
14.2		BW 3dB	Bandwidth, -3 dB		ISSBW = 1	70	80	90	kHz
14.3	BW 20dB		Bandwidth, -20 dB		ISSBW = 1	132	150	168	kHz
14.4		BW 3dB	Bandwidth, -3 dB		ISSBW = 0	106	120	135	kHz
14.5	BW 20dB		Bandwidth, -20 dB		ISSBW = 0	220	250	280	kHz
14.6		BW 3dB	Bandwidth weather band		WBON = 1	18	22	26	kHz
14.7	BW 20dB		-20dB weather band		WBON = 1	-	tbd	-	kHz
	Adjacent channel ISS filter threshold
14.8		VTHAC	Internal low threshold		ACTH	-	2.75	-	V
14.9		VTHAC	Internal high threshold		ACTH	-	3.05	-	V
	Multipath threshold
14.10		VTHMP	Internal low threshold		MPTH	-	0.50	-	V
14.11		VTHMP	Internal high threshold		MPTH	-	1.25	-	V
	ISS filter time constant
14.12		I30,31	Charge current low mid		TISS, BWDEF = 1	-89	-74	-59	µA
14.13		I30,31	Charge current high mid		TISS, BWDEF = 1	-72	-60	-48	µA
14.14		I30,31	Charge current low narrow		TISS, BWDEF = 1	-148	-124	-99	µA
14.15		I30,31	Charge current high		TISS, BWDEF = 1	-132	-110	-88	µA
			narrow
14.16		I30,31	Discharge current low		TISS, BWDEF = 0	0.5	1	1.5	µA
14.17		I30,31	Discharge current high		TISS, BWDEF = 0	11	15	19	µA
14.18		V30,31	Low voltage		BWDEF = 0		0.1	0.2	V
14.19		V30,31	High voltage		BWDEF = 1	4.6	4.9		V

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Electrical specifications and characteristics							TDA7541
Table 6.		FM section (continued)
Item		Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
	ISS filter switch threshold
14.20		V30,31	Threshold ISS on	BWDEF = 0	-	3	-	V
14.21		V30,31	Threshold ISS off	BWDEF = 0	-	1	-	V
14.22		V30,31	Threshold ISS narrow on	BWDEF = 0	-	4	-	V
14.23		V30,31	Threshold ISS narrow off	BWDEF = 0	-	2	-	V
	Deviation detection
14.24		I3	Charge current low	TDEV	-40	-32	-20	µA
14.25		I3	Charge current high	TDEV	-48	-39	-30	µA
14.26		I3	Discharge current low	TDEV	0.5	1	1.5	µA
14.27		I3	Discharge current high	TDEV	5.5	8	10.5	µA
14.28		DEVWTH	Internal low threshold	DWTH, I3 = 1 µA	-	20	-	kHz
14.29		DEVWTH	Internal high threshold	DWTH, I3 = 1 µA	-	50	-	kHz
14.30	RATIOmin		Referred to threshold	DTH	-	1	-	-
14.31	RATIOmax		Referred to threshold	DTH	-	1.5	-	-
15. Weak signal mute
15.1		V37	Upper start point	WMTH = 0, WMD = 7, VIN=V56,	-	2.9	-	V
				AF = -3 dB
15.2		V37	Lower start point	WMTH = 7, WMD = 7, VIN=V56,	-	2.7	-	V
				AF = -3 dB
15.3		aWMD	Min. mute depth	WMD = 0, WMTH = 7, V56 =OFF	10	14	-	dB
15.4		aWMD	Max. mute depth	WMD = 7, WMTH = 7, V56=OFF	22	26	-	dB
15.5		aMTHISS	Mute threshold below	WMD, WMTH, VIN=V56	-	1	-	dB
			WMTH for ISS filter “ON”
15.6		VACMTH	Internal AC mute	ACMTH	40	-	260	mV
			threshold
15.7		aACMD	AC mute depth	ACMD	3	-	8	dB
15.8		I42	Charge current	-	-65	-47.5	-30	μA
15.9		I42	Discharge current	-	1.5	2.5	4	μA
16. Multiplexer output
16.1		V23	Output voltage low	-	-	0.1	0.2	V
16.2		V23	Output voltage high	-	4.6	4.9	-	V
16.3		ROUT	Output resistance	-	200	250	300	Ω
16.4		R23load	Load resistor	-	20	-	-	kΩ

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TDA7541	Electrical specifications and characteristics

3.3.3AM section

Tamb = 25 °C, VCC1 = VCC2 = VCCMIX1 = VCCVCO = VCCIF = 8.5 V, fXtal = 10.25 MHz, fRF = 1 MHz, m = 30%, fmod = 1 kHz, in application circuit, unless otherwise specified.

Table 7.		AM section
Item		Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
17. Global
17.1	V		Usable sensitivity (1)	(S+N)/N = 26 dB	-	19	25	dBµV
		ANT_US
17.2		(S+N)/N	Signal to Noise Ratio	Ref.: V3 = 80 dBµV	50	55	-	dB
17.3		aIF	IF1 rejection	S/N = 26 dB, m = 30 %, fmod = 1 kHz	70	80	-	dB
17.4		V3	Min. RF AGC threshold	RFAGC	-	92	-	dBµV
17.5		V3	Max. RF AGC threshold		-	104	-	dBµV
17.6		V61	Min. IF AGC threshold	IFAGC	-	78	-	dBµV
17.7		V61	Max. IF AGC threshold		-	102	-	dBµV
17.8		V56	Min. DAGC threshold	DAGC	-	86	-	dBµV
17.9		V56	Max. DAGC threshold		-	98	-	dBµV
18. AGC voltage driver output
18.1		V4	Max. AGC output voltage	-	3.3	3.5	-	V
18.2		V4	Min. AGC output voltage	-	-	-	0.5	V
18.3		| I4 |	AGC current	V4 = 0 V, V54 = 3.5 V, LNA”00”	-	340	-	µA
19. AGC PIN diode driver output
19.1		I7	AGC driver current	-	-	-	-15	mA
20. AM Mixer1 (10.7 MHz)
20.1		RIN	Input resistance	differential	45	-	-	kΩ
20.2		CIN	Input capacitance	differential	-	tbd	-	pF
20.3		ROUT	Output impedance	-	530	660	790	Ω
20.4		CP1dB	1dB compression point	referred to diff. mixer input	-	112	-	dBμV
20.5		V3,6	Input DC bias	-	0.3	0.4	0.55	V
20.6		IIP3	3rd order intermodulation	-	-	132	-	dBμV
20.7		INOISE	Equivalent input noise	-	-	5.5	-	nV/√Hz
20.8		G	Gain	With 330 Ω filter	3	5.5	7	dB

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Electrical specifications and characteristics							TDA7541
Table 7.		AM section (continued)
Item		Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
21. AM mixer2
21.1		RIN	Input resistance	-	265	330	396	Ω
21.2		CIN	Input capacitance	-	-	2.5	-	pF
21.3		V55.56	DC input voltage	-	3.8	4	4.2	V
21.4		ROUT	Output resistance	-	100	-	-	kΩ
21.5		COUT	Output capacitance	-	-	2.5	-	pF
21.6		V52,53	DC output voltage	-	3.7	4.0	4.3	V
21.7		gm	Conversion	MIX2OUT	-	440	-	µA/V
			transconductance
21.8		Gmax	Max. gain	L = 560 µH, Q = 28; C = 180 pF,	-	26	-	dB
				referred to MIX2OUT
21.9		G	Gain control range	-	-	20	-	dB
21.10		Cstep	Min. cap. Step	IF2A	-	2.2	-	pF
21.11		Cmax	Max. cap.	IF2A	-	33	-	pF
			Equivalent input noise	Amax , Rgen= 330 Ω, RL = 2 kΩ,				nV/√H
21.12		INOISE	voltage,		-	11	-
				noise of Rgen not included				z
			including buffer mixer2
21.13		CP1dB	1dB compression point	Amax , referred to 330 Ω input	-	114	-	dBμV
21.14		IIP3	3rd order Intermodulation	Amax , referred to 330 Ω input	-	132	-	dBμV
22. Buffer AM mixer2
22.1		ROUT	Output resistance	-	1.6	2	2.4	kΩ
22.2		COUT	Output capacitance	-		2.5		pF
22.3		V50	DC output voltage	-	3.7	4.0	4.3	V
22.4		G	gain	RL = 2 kΩ	-8	-6	-4	dB
23. AM IF2 amplifier
23.1		RIN	Input resistance	-	1.6	2	2.4	kΩ
23.2		CIN	Input capacitance	-		2.5		pF
23.3		V44,47	DC input voltage	-	4.1	4.3	4.5	V
23.4		Gmax	Max. gain	-	49	52	55	dB
23.5		G	Gain control range	-	36	38	40	dB
23.6		INOISE	Equivalent input noise	Gmax , Rgen = 2 kΩ,	-	9.5	-	nV/√Hz
			voltage	noise of Rgen not included
23.7		CP1dB	1 dB compression point	Gmax , referred to 2 kΩ input	-	74	-	dBμV
23.8		IIP3	3rd order Intermodulation	Gmax , referred to 2 kΩ input	-	100	-	dBμV
23.9		V23	IF2 output voltage	V56 = 90 dBV, m = off	140	190	240	mVRMS

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TDA7541				Electrical specifications and characteristics
Table 7.		AM section (continued)
Item		Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
24. AMAGC2
24.1	VAGC(start)		AGC start voltage (PIN47)	Input carrier voltage	-	62	-	dBµV
				Between start of AGC2
24.2		AGC	AGC2 range	and the intervention point	50	55	-	dB
				of prestage AGC
24.3		gAGC	Control slope	Seek mode	-	50	-	µA/V
24.4		gAGC	Control slope	normal mode	-	5	-	µA/V
24.5		II57I	Max. AGC charge current	Seek mode	-	125	-	μA
24.6		II57I	Max. AGC charge current	normal mode	-	5	-	μA
24.7		V57	Max. AGC output voltage	V47 = 100 dBµ	4.6	4.8	-	V
24.8		V57	Min. AGC output voltage	V47 = 20 dBµ	-	0.2	0.5	V
25. AM audio output
25.1		V43	Audio output voltage	V56 = 90 dBµ, m = 30 %,	170	200	230	mVRM
				fmod = 1KHz				S
25.2				V56 = 90 dBµ, m = 30 %,	-	0.3	0.5
		THD	Total harmonic distortion	fmod = 1 kHz				%
25.3				V56 = 90 dBµ, m = 80%,	-	0.5	0.9
				fmod = 1 kHz
25.4		ROUT	Output impedance	-	20	25	30	Ω
26. IF noise blanking
26.1		tbl	Min. blanking time	-	-	8	-	μs
26.2		tbl	Max. blanking time	-	-	17	-	μs
26.3		Vth	Min internal threshold	-	-	50	-	mV
26.4		Vth	Max. internal threshold	-	-	187.5	-	mV
26.5		Vthstep	Threshold step	-	-	12.5	-	mV

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

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Electrical specifications and characteristics	TDA7541

3.3.4Stereo decoder

Tamb = 25 °C, VCC1 = VCC2 = VCCMIX1 = VCCVCO = VCCIF = 8.5 V, fXtal = 10.25 MHz, VMPX = 500 mVrms mono, f = 1 kHz, deemphasis τ = 50 µs, in application circuit, unless

otherwise specified.

	Table 8.		Stereo decoder section
	Item	Symbol		Parameter	Test conditions	Min.	Typ.	Max.	Unit
	27. Stereo decoder
	27.1		Vin	MPX input level	-	-	0.5	0.93	Vrms
	27.2				WBON = 1	-	0.05	0.06
	27.3		Rin	Input resistance	-	80	100	120	kΩ
	27.4		GSTD	Stereo decoder gain	-	2	2.5	3	dB
	27.5	GSTDWB		Stereo decoder gain	Weather band mode	23	26	27	dB
	27.6		SVRR	Supply voltage ripple	Vripple = 100 mV, f = 1 kHz	-	60	-	dB
				rejection
	27.7		A	channel separation	VMPX = 500 mVrms stereo, only	35	40	-	dB
					L/R, ROC adjusted
	27.8		THD	Total harmonic distortion	-	-	0.02	0.3	%
	27.9	(S+N)/N		Signal plus noise to noise	A-weighted, 19 kHz notch	-	85	-	dB
				ratio
	28. Mono/stereo switch
	28.1	VPTHST1		Pilot threshold voltage	for Stereo, PTH = 1	5	8	12	mVrms
	28.2	VPTHST0		Pilot threshold voltage	for Stereo, PTH = 0	7	11	16	mVrms
	28.3	VPTHMO1		Pilot threshold voltage	for Mono, PTH = 1	3.5	6	10	mVrms
	28.4	VPTHMO0		Pilot threshold voltage	for Mono, PTH = 0	6	9	14	mVrms
	29. 19kHz PLL
	29.1		flock	Capture range	Pilot magnitude 20 mVrms = 4 %	18.9	-	19.1	kHz
	29.2		DP	Pilot deviation range	fpilot = 19 kHz	4	-	30	%
	30. Deemphasis and highcut
	30.1		tHC50	Deemphasis time	DEEMP=0, High Cut OFF	45	50	55	μs
				constant
	30.2		tHC75	Deemphasis time	DEEMP = 1, High Cut OFF	67	75	83	μs
				constant
	30.3		tHC50	Highcut time constant	DEEMP = 0, High Cut ON,	135	150	165	μs
					V28=0.1V
	30.4		tHC75	Highcut time constant	DEEMP= 1, High Cut ON,	200	225	250	μs
					V28 = 0.1 V
	30.5		AAmmin	Min. Attenuation in AM	Voutmax/Vout@ f = 3.5 kHz,	4.5	6.5	8.5	dB
					DEEMP = 0, AMCF “111”

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TDA7541									Electrical specifications and characteristics
Table 8.				Stereo decoder section (continued)
Item	Symbol				Parameter				Test conditions	Min.	Typ.	Max.	Unit
30.6		AAmmax			Max. Attenuation in AM		Voutmax/Vout@ f = 3.5 kHz,			11	14	17	dB
							DEEMP= 0, AMCF “000”
31. Stereo blend and high cut control
31.1		LGmin			Min. level gain		LG			-0.3	0	0.3	dB
31.2		LGmax			Max. level gain		LG			7.75	8.25	8.75	dB
31.3		LGstep			Level gain step Resolution		-			0.25	0.55	0.85	dB
31.4	VSBLmin				Min. voltage for mono		SBC			24	29	34	%VREF1
31.5	VSBLmax				Max. voltage for mono		SBC			53	58	63	%VREF1
31.6	VSBLstep				Step resolution		SBC			3.5	4.2	5	%VREF1
31.7	VHCHmin				Min. voltage for no highcut		HCHT			37	42	47	%VREF1
31.8	VHCHmax				Max.voltage for no highcut		HCHT			61	66	71	%VREF1
31.9	VHCHstep				Step resolution		HCHT			7	8	9	%VREF1
31.10	VHCLmin				Min. voltage for full high cut		HCLT			6	11	16	%VHCH
31.11	VHCLmax				Max. voltage for full high cut		HCLT			28	33	38	%VHCH
31.12	VHCLstep				Step resolution		HCLT			6.5	7.3	8.1	%VHCH
32. Carrier and harmonic suppression at the output
32.1				a19	Pilot signal f = 19 kHz		-			45	50	-	dB
32.2				a38	Subcarrier	f = 38 kHz	-			-	75	-	dB
32.3				a57	Subcarrier	f = 57 kHz	-			-	62	-	dB
32.4				a76	Subcarrier	f = 76 kHz	-			-	90	-	dB
33. Intermodulation (1)
33.1				a2	fmod = 10 kHz, fspur =1 kHz		-			-	65	-	dB
33.2				a3	fmod = 13 kHz, fspur =1 kHz		-			-	75	-	dB
34. Traffic radio (2)
34.1				a57	Signal f = 57 kHz		-			65	70	-	dB
35. SCA (3)
35.1				a67	Signal f = 67 kHz		-			-	75	-	dB
36. ACI – adjacent channel interference (4)
36.1		a114			Signal f = 114 kHz		-			-	95	-	dB
36.2		a190			Signal f = 190 kHz		-			-	84	-	dB
37. FM noise blanker
37.1		V		TRMIN	Min. trigger threshold (5)		V		=0.8 V, NBLT “111”	-	147	-	mV
								PEAK					OP
37.2		V	TRMAX		Max. trigger threshold (5)		V	PEAK	=0.8 V, NBLT “000”	-	280	-	mV
													OP

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Electrical specifications and characteristics								TDA7541
Table 8.		Stereo decoder section (continued)
Item	Symbol		Parameter	Test conditions	Min.	Typ.	Max.		Unit
37.3	VTRNOISE		Min. noise controlled	VPEAK = 1.5 V, NBCT “11”	-	450	-		mVOP
			trigger threshold
37.4	VTRNOISE		Max. noise controlled	VPEAK = 1.5 V, NBCT “00”	-	1200	-		mVOP
			trigger threshold
37.5		VPEAK	Peak voltage	NBRR “00”, VMPX = 0 mV	-	0.8	-		V
37.6		VPEAK	Peak voltage	NBRR “00”, VMPX = 50 mV,	-	1.9	-		V
				f = 150 kHz
37.7		VPEAK	Peak voltage	NBRR “00”, VMPX = 200 mV,	-	3.5	-		V
				f = 150 kHz
37.8	VPEAKDEV		Min. deviation dependent	VMPX = 500 mV,	-	0.8	-		V
			peak voltage	NBDC = 11 (“OFF”)
37.9	VPEAKDEV		Max. deviation dependent	VMPX = 500 mV, NBDC= 00	-	2.0	-		V
			peak voltage
37.10	VPEAKFS		Min. fieldstrength	VMPX=0mV, VLEVEL<< VSBL	-	0.8	-		V
			controlled peak voltage	(fully mono), NBFC = 11 (“OFF”)
37.11	VPEAKFS		Max. fieldstrength	VMPX=0mV, VLEVEL<< VSBL	-	2.0	-		V
			controlled peak voltage	(fully mono), NBFC = 00
37.12		TS	Min. blanking time	Signal HOLDN in testmode,	-	38	-		μs
				NBT = 00
37.13		TS	Max. blanking time	Signal HOLDN in testmode,	-	22	-		μs
				NBT = 11
37.14		SRPEAK	Noise rectifier charge	Signal PEAK in testmode,	-	5	-		mV/μs
				NBPC =0
37.15		SRPEAK	Noise rectifier charge	Signal PEAK in testmode,	-	12	-		mV/μs
				NBPC=1
37.16	VRECTADJ		Noise rectifier discharge	Signal PEAK in testmode,	-	0.3	-		V/ms
			adjustment	NBRR=00
37.17	VRECTADJ		Noise rectifier discharge	Signal PEAK in testmode,	-	1.8	-		V/ms
			adjustment	NBRR=01
37.18	VRECTADJ		Noise rectifier discharge	Signal PEAK in testmode,	-	2.8	-		V/ms
			adjustment	NBRR=10
37.19	VRECTADJ		Noise rectifier discharge	Signal PEAK in testmode,	-	4	-		V/ms
			adjustment	NBRR=11
			Noise rectifier adjustment	Signal PEAK in testmode,
37.20		VADJMP		VMPTC=1V, NBSMP=0, NBMP=1,	-	3	-		V/ms
			by multipath
				NBRR=01
			Noise rectifier adjustment	Signal PEAK in testmode,
37.21		VADJMP	by strong multipath	VMPTC = 1V, NBSMP = 1,	-	4	-
			influence	NBMP = 0, NBRR = 01
			Noise rectifier adjustment	Signal PEAK in testmode,
37.22		VADJMP	by multipath and strong	VMPTC=1 V, MBSMP=1,	-	5.2	-		V/ms
			multipath influence	NBMP=1, NBRR=01

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TDA7541							Electrical specifications and characteristics
Table 8.		Stereo decoder section (continued)
Item	Symbol		Parameter		Test conditions			Min.	Typ.	Max.	Unit
38. Multipath detector
38.1		GMP	Min. multipath gain		MPG = 00			5	6	7	dB
38.2		GMP	Max. multipath gain		MPG = 11			11	12	13	dB
38.3	GRECTMP		Min. rectifier gain		MPRG = 01			-1	0	1	dB
38.4	GRECTMP		Max. rectifier gain		MPRG = 11			5	7.6	9	dB
38.5		ICHMP	Rectifier charge current		MPCC = 0			0.5	0.8	1.1	μA
38.6		ICHMP	Rectifier charge current		MPCC = 1			0.2	0.4	0.7	μA
38.7		IDISMP	Rectifier discharge current		-			0.5	1		mA
39. Quality detector
39.1		a	Min. quality detector		QDC			0.5	0.6	0.7	-
			coefficient
39.2		a	Max. quality detector		QDC			0.9	1.05	1.2	-
			coefficient
39.3		b	Min. quality noise gain		QNG			5	6	7	dB
39.4		b	Max. quality noise gain		QNG			13	15	17	dB
1. Intermodulation suppression
			a2=	Vo(signal,@1 kHz)		;ƒs=	((2 × 10 kHz) – 19 kHz)
				V-----o---(--spurious------------------------ ,@1 kHz)-----------------------------
			a3=	Vo(signal,@1 kHz)		;ƒs=	((3 × 13 kHz) – 38 kHz)
				V-----o---(--spurious------------------------ ,@1 kHz)-----------------------------
measured with: 91 % stereo signal; 9 % pilot signal; fm = 10 kHz or 13 kHz.
2. Traffic radio (V.F.) suppression
					Vo(signal,@1 kHz)
				a57(V,W,F)= Vo(spurious-------------------------------------,-@1-------------kHz-----------)----±-----23---------kHz----------
measured with: 91% stereo signal; 9% pilot signal; fm=1 kHz; 5% sub carrier (f=57 kHz, fm=23 Hz AM, m=60 %)
3. SCA (subsidiary communications authorization)
				Vo(signal,@1 kHz)			((2 × 38 kHz) – 67 kHz)
			a67=	V-----o---(--spurious----------------------- ,@9 kHz)------------------------------ ;ƒs=

measured with: 81 % mono signal; 9 % pilot signal; fm=1 kHz; 10 % SCA - sub carrier (fS = 67 kHz, unmodulated) 4. ACI (adjacent channel interference)

Vo(signal,@1 kHz)

a114= --------------------------------------------------------------- ;ƒs= (110 kHz – (2 × 38 kHz))

Vo(spurious,@4 kHz)

Vo(signal,@1 kHz)

a190= --------------------------------------------------------------- ; ƒs= (186 kHz – (5 × 38 kHz))

Vo(spurious,@4 kHz)

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

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

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