sames

SA2531 A/B/C/E/G/U

1/24

VERSATILE SINGLE CHIP TELEPHONE

WITH 14 NUMBER REPERTORY DIALLER

sames

SA2531 A/B/C/D/E/F/G/J/U

s

Speech circuit, LD/MF Repertory Dialler

and Tone Ringer on one 28 pin CMOS

chip

s

Net 4 compatible

s

Soft clip to avoid harsh distortion

s

Line Loss Compensation selectable by

pin option

s

Power down mode

s

Versatile applications for different PTT

demands

s

31 digit last number redial

s

Sliding Cursor protocol with comparison

s

2 Flash keys, 100 ms and 280 ms (option

600 ms)

s

Ring frequency discrimination

s

Operating range from 13 to 100 mA

(down to 5 mA with reduced perform-

ance)

s

Volume control of receive signalExcept

"D")

s

Low noise (max. -72dBmp)

s

Real or Complex impedance on chip pro-

grammable

s

LD/MF switchable dialling

s

14 memories, 4 direct/10 indirect or 10

direct

s

Pause key for 2, 3 or 6 sec Auto Pause or

Wait function

s

On chip MF filter (CEPT CS 203 compat-

ible)

s

3-tone melody generator

FEATURES

M82-2013

PDS039-SA2531-001

Rev.D

15-05-97

GENERAL DESCRIPTION

The SA2531 is a CMOS integrated circuit that contains all the functions needed to form a high

performance electronic telephone.

The device incorporates LD/MF repertory dialling, melody generation, ring frequency

discrimination and a high quality speech circuit.

A RAM is on chip for a 31 digit last number redial and 14 memories each containing up to 21

digits. The sliding cursor procedure makes Last Number Redial easy behind a PABX.

The SA2531 (exept the SA2531D) incorporates a volume control for the earpiece. The receive

volume can be controlled by the VOL key (+4dB) or by the +/- keys (+6dB/-4dB in 5 steps).

The versatility of the circuit is provided by on chip programmability and a few external

components. This allows easy adaption to different PTT requirements without changing the

PCB of the telephone.