KA8504

SPEECH NETWORK WITH DIALER INTERFACE

PIN CONFIGURATION

Fig. 2

PIN DESCRIPTION

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

V

L

CI

CO

BIAS

MF

MUTE

V

R

GND

Vcc

RXO

ROF

RXI

GC

MIC-

MIC+

TOF

Pin No

Symbol

Description

1

Positive power line and TX Amp Output.

2

CI

Current input.

3

CO

Current output.

If the line current is large, this pin dissipates excess power (current)

4

BIAS

AC signal reference voltage terminal.

5

MF

DTMF input.

When the mute pin is “H” level, this pin become active.

6

MUTE

Mute input.

When this pin is 'H’level, speech circuit is muted and the DTMF input is enabled.

7

The voltage of this part becomes reference voltage of internal Amp.

8

GND

Negative power line.

9

TOF

Output of the Mic Amp.

Negative feedback to MIC -.

10

MIC +

Non inverting Mic input.

11

MIC -

Inverting Mic input.

12

GC

Gain triggering point regulation.

13

RXI

Receiver input.

14

ROF

RX out and negative feedback to RX input.

15

RXO

Receiver Amp out.

16