PIN DESCRIPTION

PIN

SYMBOL

DESCRIPTION

1

LP_FM

Filter OPAMP input, charge pump output (FM mode)

2

LP_HC

Filter OPAMP input, charge pump output (high current mode)

3

LP_AM

Filter OPAMP input, charge pump output (AM mode)

4

VREF

OPAMP reference voltage

5

DOUT3

Digital Output 3 (open collector)

6

DOUT4

Digital Output 4 (open collector)

7

DOUT5

Digital Output 5 (open collector)

8

DOUT6

Digital Output 6 (open collector)

9

OSCIN

Reference Oscillator Input

10

OSCOUT

Reference Oscillator Output

11

N.C.

Not connected

12

SCL

I

13

SDA

I

14

IF_AM

IF counter HF input

15

IF_FM

IF counter VHF input

16

SSTOP

IF counter result output

17*

DOUT1

Digital output 1 (push-pull)

17*

INLOCK

Inlock detector output

18

DOUT2

Digital Output 2 (open collector)

19

HF-REF

HF reference pin

20

ADDR

I

21

VDD1

Supply Voltage

22

GND-DIG

Digital ground

23

N.C.

Not connected

24

FM_IN

High frequency input FM

25

AM_IN

High frequency input AM

26

GND-AN

Analog ground

27

VDD2

Supply Voltage

28

LP_OUT

Filter OPAMP output

* Pin function is selectable by software (see software specification)

TDA7427A

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