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SA2532C Datasheet Preview

SA2532C Datasheet

VERSATILE SINGLE CHIP TELEPHONE

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SA2532
SA2532 A/C/U
VERSATILE SINGLE CHIP TELEPHONE
FEATURES
n Speech circuit, LD/MF Dialler and Tone
Ringer on one 28 pin CMOS chip
n Soft clip to avoid harsh distortion
n Line Loss Compensation selectable by
pin option
n Power down mode
n Versatile applications for different PTT
demands
n 31 digit last number redial
n Sliding Cursor protocol with comparison
n 2 Flash keys, 100 ms and 280 ms (option
600 ms)
n Pause key for 3 sec Auto Pause or Wait
Function
n Ring frequency discrimination
n Operating range from 13 to 100 mA
(down to 5 mA with reduced perform-
ance)
n Low noise (max. -72dBmp)
n Real or Complex impedance on chip pro-
grammable
n LD/MF switchable dialling
n On chip MF filter (CEPT CS 203 compat-
ible)
n 3-tone melody generator with selectable
repetition rates
GENERAL DESCRIPTION
The SA2532 is a CMOS integrated circuit that
contains all the functions needed to form a
high performance electronic telephone.
The device incorporates LD/MF dialling,
melody generation, ring frequency discrimi-
nation and a high quality speech circuit.
A RAM is on chip for a 31 digit last number
redial. The sliding cursor procedure makes
Last Number Redial easy behind a PABX.
The versatility of the circuit is provided by on
chip programmability and a few external com-
ponents. This allows easy adaption to differ-
ent PTT requirements without changing the
PCB of the telephone.
PACKAGE
Available in 28 pin DIP and SOIC
LS
RO2
RO1
VDD
AGND
STB
CI
MO
LLC
HS DP
OSC
RR
C4
C3
1 28
SA2532
14 15
RI
LI
VSS
CS
M2
M1
MODE
FCI
R1
R2
R3
R4
C1
C2
sames
4153
DR-00975
PDS039-SA2532-001 Rev. C
1/22
1/22
23-10-1995




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SA2532C Datasheet Preview

SA2532C Datasheet

VERSATILE SINGLE CHIP TELEPHONE

No Preview Available !

SA2532
PIN DESCRIPTION
Pin# Symbol Function
23 M1
Microphone Inputs
24 M2
Differential inputs for the microphone (electret).
3 RO1 Receiver Outputs
2 RO2 These are the outputs for driving a dynamic earpiece with an impedance
of 100 to 300
5A
Analog Ground
GND
This is the analog ground for the amplifiers.
28 RI
Receive Input
This is the input for the receive signal.
6 STB Side Tone Balance Input
This is the input for side tone cancellation.
1 LS
Line Current Sense Input
This is the input for sensing the line current.
27 LI
Line Input
This input is used for power extraction and line current sensing.
25 CS
Current Shunt Control Output
This N-channel open drain output controls the external high power shunt
transistor for the modulation of the line voltage and for shorting the line
during make period of pulse dialling.
4 VDD
Positive Voltage Supply
This is the supply pin for the circuit.
26 V
SS
8 MO
Negative Power Supply
Melody Output
Pulse Density Modulated output of the melody generator for tone ringer. At
high impedance when not active.
21 FCI
Frequency Comparator Input
This is a Schmitt trigger input for ring frequency discrimination. Disabled
during off-hook.
10 HS/DP Hook Switch Input and Dial Pulse Output
This is an I/O that is pulled high by the hook switch when off- hook. An open
drain pulls it low during break periods of pulse dialling and flash.
11 OSC
Oscillator Input
Oscillator pin for Xtal or ceramic resonator (3.58 MHz).
9 LLC Line Loss Compensation
Select pin for line loss compensation.
12 RR
Repetition Rate
Select pin for repetition rate of melody.
22 MODE Signalling Mode Select Input
Mode pin Function
High
LD default mode, make/break = 33/66 ms
Open
MF only
Low LD default mode, make/break = 40/60 ms
20 R1
Keyboard Rows
19 R2
18 R3
17 R4
16 C1
Keyboard Columns
15 C2
14 C3
13 C4
7 CI
Complex Impedance Input
Input pin for the capacitor in the complex impedance
2/22 sames


Part Number SA2532C
Description VERSATILE SINGLE CHIP TELEPHONE
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