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PDF SA2531 Data sheet ( Hoja de datos )
| Número de pieza | SA2531 | |
| Descripción | VERSATILE SINGLE CHIP TELEPHONE WITH 14 NUMBER REPERTORY DIALLER | |
| Fabricantes | Sames | |
| Logotipo |  |
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SA2531 A/B/C/E/G/U
sames
SA2531 A/B/C/D/E/F/G/J/U
VERSATILE SINGLE CHIP TELEPHONE
WITH 14 NUMBER REPERTORY DIALLER
FEATURES
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
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.
M82-2013
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PDS039-SA2531-001 Rev.D
1/24
15-05-97
1 page  
SA2531 A/B/C/E/G/U
or after pressing the MUTE key, the gain is reduced by > 60 dB.
Receive
The receive input is the differential signal of RI and STB. The gain of the receive path
is 2 dB (test circuit figure 5) with differential outputs, RO1/RO2 (0dB on 1000Ω versions).
When mute is active during dialling the gain is reduced by > 60dB. During DTMF dialling
a MF comfort tone is applied to the receiver. The comfort tone is the DTMF signal with
a level that is -30dB relative to the line signal.
The receive gain can be adjusted under user control by using the volume control keys (not
on SA2531D). The VOL key gives a 4dB increase or returns the gain to normal in a Toggle
Function. Alternatively the + and - keys may be used. The + key increases the gain to
a maximum of +6dB while the - key reduces the gain to a minimum of -4dB. Each press
of the keys changes the gain by approximately 2dB.
The gain is reset by the next on-hook.
Side Tone
Side Tone is controlled along with Return Loss by a Double Balance Bridge as shown in
Fig. 1.
Figure 1
Double balance bridge (return loss and side tone) with one common ground
A good side tone cancellation is achieved by using the following equation:
ZBAL = R5
ZLINE
R1
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5 Page 
SA2531 A/B/C/E/G/U
Digit 2-5-8-0 1336 Hz
Digit 3-6-9-# 1477Hz
(Error = +.176%)
(Error = -.141%)
Errors are calculated with reference to a base clock of 3.58MHz and at ambient
temperature of 24°C. They exclude tolerance errors in the base frequency.
OPERATING PROCEDURES
Procedure Principles
The procedures for utilizing the features of the SA2531 are optimized out of consideration for
the human factor in order to:
- meet the user’s expectations
- be easy to learn and relearn
SYMBOLS
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet SA2531.PDF ] | |
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