KA8512

COMPANDOR

PIN CONFIGURATION

PIN DESCRIPTION

1

2

3

4

5

6

7

8

9

10

11

12

13

14

KA8512

EPI

ERC

EO

EMUTE

CMUTE

GND

CPI+

CO

AGIC

CRC

CPI-

ALC

Pin No

Symbol

Description

1

to the compressor and expander of compandor.

2

EPI

It is SUM AMP input terminal of expander. The voice signal recoverd after

the demodulation waveform from the receiver passed through the 2’nd order

low pass filter enters this terminal.

3

ERC

This terminal is used for converting waveform from the full wave rectifier to

DC element at the rectifier block of expander

(R X C = 22msec)

4

EO

It is an output terminal of expander, which a regenerated voice signal

comes out.

5

EMUTE

It is an expander mute terminal of compandor and the final mute block

of an expander located next to the receiver terminal. It blocks the data sig-

nal of MICOM being transmitted to an user, and is connected to the RX

mute terminal of MICOM.

Expanding is executed if this terminal is high, and expander mute is exe-

cuted if it is low.