SA2531 A/B/C/E/G/U
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FEATURES
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Speech circuit, LD/MF Repertory Dialler
and Tone Ringer on one 28 pin CMOS
chip
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SA2531 A/B/C/D/E/F/G/J/U
VERSATILE SINGLE CHIP TELEPHONE
WITH 14 NUMBER REPERTORY DIALLER
Operating range from 13 to 100 mA
(down to 5 mA with reduced perform-
ance)
Volume control of receive signalExcept
"D")
Low noise (max. -72dBmp)
Real or Complex impedance on chip pro-
grammable
LD/MF switchable dialling
14 memories, 4 direct/10 indirect or 10
direct
Pause key for 2, 3 or 6 sec Auto Pause or
Wait function
On chip MF filter (CEPT CS 203 compat-
ible)
3-tone melody generator
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Net 4 compatible
Soft clip to avoid harsh distortion
Line Loss Compensation selectable by
pin option
Power down mode
Versatile applications for different PTT
demands
31 digit last number redial
Sliding Cursor protocol with comparison
2 Flash keys, 100 ms and 280 ms (option
600 ms)
Ring frequency discrimination
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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.
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M82-2013
PDS039-SA2531-001
Rev.D
1/24
15-05-97
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