Preliminary Data Sheet

AS2507

2/9

July 1998

Pin description

Pin #

DIP 14

Pin #

SO 16

Symbol

Function

77

M1

Differential input for the microphone (electret)

66

M2

Differential input for the microphone (electret)

22

RI

Input for ac-separated receive signal

44

RO

Output for driving a dynamic earpiece with an impedance from 150

Ω to

300

Ω

14

15

16

VDD

Positive Power Supply

99

10

VSS

Negative Power Supply

88

AGND

Signal ground for the internal amplifiers

11

12

OSC1

Output to ceramic resonator 3.58MHz.

12

13

OSC2

Input for ceramic resonator 3.58MHz.

55

PD

Active high, i.e. a high level on this pin will power down the analogue

signal path.

10

11

RxD

Output of the FSK demodulator

13

14

TxD

Input for the FSK modulator

11

TE

Input for enabling transmit data