2

INDUSTRIAL TEMPERATURE RANGE

IDT821034 QUAD PCM CODEC WITH PROGRAMMABLE GAIN

PIN CONFIGURATIONS

PIN DESCRIPTION

Name

Type

Pin Number

Description

GNDA

--

46

51

52

40

41

Analog Ground.

All ground pins should be connected to the ground plane of the circuit board.

VDDA

--

47

45

+5 V Analog Power Supply.

This pin should be bypassed to ground using 0.1µF capacitor. All power supply pins should be connected to

the power plane of the circuit board.

VFRO3

VFRO2

VFRO1

VFRO0

O

3

48

44

37

Voice Frequency Receiver Output.

This is the output of receive power amplifier. It can drive 2000 Ω (or greater) load.

GSX3

GSX2

GSX1

GSX0

O

2

49

43

38

Gain Setting Transmit Amplifier Output.

This pin is the output of the gain setting amplifier, and the input to the differential transmit filter. It should be

connected to the corresponding VFXI pin through a resistive network to set the transmit gain. Refer to Figure

5 for details.

VFXI3

VFXI2

VFXI1

VFXI0

I

1

50

42

39

Voice Frequency Transmitter Input.

This pin is the input to the gain setting amplifier in the transmit path.

O3_4

O3_3

O3_2

O

9

10

11

SLIC Signaling Output for Channel 3.

O2_4

O2_3

O2_2

O

4

5

6

SLIC Signaling Output for Channel 2.

52-Pin PQFP

26

25

24

23

22

21

20

19

18

17

16

15

14

I/O0_0

GND

CS

CI

CO

CCLK

BCLK

MCLK

FS

TSX

DR

VDD

DX

40

41

42

43

44

45

46

47

48

49

50

51

52

GNDA

GNDA

VFXI1

GSX1

VFRO1

VDDA

GNDA

VDDA

VFRO2

GSX2

VFXI2

GNDA

GNDA