![](http://datasheet.mmic.net.cn/390000/SA2531B_datasheet_16832208/SA2531B_1.png)
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
I
Speech circuit, LD/MF Repertory Dialler
and Tone Ringer on one 28 pin CMOS
chip
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Net 4 compatible
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Soft clip to avoid harsh distortion
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Line Loss Compensation selectable by
pin option
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Power down mode
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Versatile applications for different PTT
demands
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31 digit last number redial
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Sliding Cursor protocol with comparison
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2 Flash keys, 100 ms and 280 ms (option
600 ms)
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Ring frequency discrimination
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Operating range from 13 to 100 mA
(down to 5 mA with reduced perform-
ance)
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Volume control of receive signalExcept
"D")
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Low noise (max. -72dBmp)
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Real or Complex impedance on chip pro-
grammable
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LD/MF switchable dialling
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14 memories, 4 direct/10 indirect or 10
direct
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Pause key for 2, 3 or 6 sec Auto Pause or
Wait function
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On chip MF filter (CEPT CS 203 compat-
ible)
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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.