E-TDA7421N 查看數據表（PDF） - STMicroelectronics

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E-TDA7421N

AM/FM tuner for car radio and Hi-Fi applications

STMicroelectronics 

Pin description

TDA7421N

Table 2. Pin description (continued)

Pin #

Pin name

Function

15

FM RF ADJ Tuning varicap voltage for RF FM filter

16

PLL VCC PLL positive supply

17

LP OUT

Op Amp output to PLL loop filters

18

LP IN1

FM loop filter connection to op-amp inverting input

19

LP IN2

AM loop filter connection to op-amp inverting input

20

LP IN3

FM-HS loop filter connection to op-amp inverting input

21

PLL VREF Voltage reference to Op Amp noninverting input

22

PLL GND PLL ground

23

SLEEP

I2C bus disconnect signal

24

SDA

I2C bus data

25

SCL

I2C bus clock

26

DIG VDD

Digital positive supply

27

28 (*)

29

30

31

32

33

34

35

DIG GND

IFC SSTOP

AM STEREO

OUT

CLN GND

IF2 GND

AM AGC2 TC

AM DET

AM BPF

AM REF

AM IF2 in

Digital ground

IF-Counter stop signal or

AM IF2 amplifier output

“Clean” ground

IF2 ground

AM 2nd AGC time constant

AM detector capacitor

AM IF filter

Reference voltage of AM IF amplifier

AM IF2 amplifier input

36

IF2 VCC

IF2 positive supply

37

FM QUAD - FM quadrature detector tank (differential -)

38

FM QUAD + FM quadrature detector tank (differential +)

39

AUDIO OUT FM MPX/AM Audio output

40(1)

41(1)

FM SD

AM SD

FM SMETER

AM SMETER

FM DET ADJ

FM station detector output or

AM station detector output

FM S-meter output or

AM S-meter output or

FM detector adjustment output

42 FM MUTE DRIVE FM mute time constant

43

FM BW TC FM detuning detector time constant

44

IF1 GND

IF1 ground

45

FM LIM IN - FM limiter negative input (differential -)

8/47

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