SA2531EASA datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > Wireless rf/communication> Telecom circuit> SA2531EASA

SA2531EASA: DescriptionTelephone Circuit, CMOS, PDSO28; CategoryWireless rf/communication Telecom circuit; File Size392KB，24 Pages; ManufacturerSAMES; Websitehttp://www.sames.co.za

Download Datasheet Parametric View All

SA2531EASA Overview

Telephone Circuit, CMOS, PDSO28

SA2531EASA Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	SAMES
package instruction	SOP, SOP28,.3
Reach Compliance Code	unknow
JESD-30 code	R-PDSO-G28
JESD-609 code	e0
Number of terminals	28
Maximum operating temperature	70 °C
Minimum operating temperature	-25 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP28,.3
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
power supply	2.5 V
Certification status	Not Qualified
Maximum slew rate	5 mA
Nominal supply voltage	2.5 V
surface mount	YES
technology	CMOS
Temperature level	OTHER
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL

Preview

Download Datasheet

View All

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

sames

FEATURES

Speech circuit, LD/MF Repertory Dialler

and Tone Ringer on one 28 pin CMOS

chip

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

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

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.

sames

M82-2013

PDS039-SA2531-001

Rev.D

1/24

15-05-97

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

FUNCTIONAL DESCRIPTION

Power On Reset

The on chip power on reset circuit monitors the supply voltage (V

). When V

rises above

approx. 1.2V, a power on reset occurs to assure correct start-up and the RAM is cleared.

DC Conditions

The normal operating range is from 13mA to 100 mA. Operating range with reduced

performance is from 5mA to 13mA. In the operating range all functions are operational.

At line currents below 13mA the SA2531 provided an additional scope below 4.5V to allow

parallel operation. (See Figure 12).

The dc characteristic (excluding diode bridge and Pulsing transistors) is determined by the

voltage at LI and the resistor R1 as follows:

VLS = VLI + I

Line

.R1

The voltage at LI is 4.5V.

During pulse dialling the speech circuit and other parts of the device not required are in a

power down mode to save current. The CS pin is pulled to V

in order to turn the external

shunt transistor on to keep a low voltage drop at the LS pin during make periods.

AC Impedance

The Characteristic or Output impedance of the SA2531 is set within the IC and adjusted by

Mask Options. Available options are for 600Ω and 1000Ω. When the 1000Ω option is selected

then a capacitor may be added to the circuit at pin CI to add a reactive element and make the

output impedance complex.

Oscillator

All the Timing Functions of the SA2531 are based on a Clock Frequency of 3.58MHz. A crystal

or ceramic resonator of this frequency should be connected to the OSC pin. In practise minor

deviations from the nominal frequency may occur due to the characteristics of the frequency

reference device used and so it is recommended that care is taken in the selection of

components.

Typically a small value capacitor (

≤47pF)

should be connected in parallel with the Frequency

Reference to ensure start-up and/or operation at the nominal frequency.

Speech Circuit

The speech circuit consists of a transmit and a receive path born with soft clip, mute, line loss

compensation and side tone cancellation.

Transmit

The gain of the transmit from M1/M2 to LS is 35dB for 600Ω versions and 37dB for 1000Ω

versions (see test circuit figure 5). The microphone input is differential with an input

impedance of 25 kΩ.

The soft clip circuit limits the output voltage at LI to 2.0V

PEAK

(see figures 8 & 9). The attack

time is 30µs/6dB and the decay time is 20 ms/6 dB. When mute is active, during dialling

4/24

sames

Recommended Resources

Modern home automation remote control systemc

Wide dynamic range gain control amplifier circuit diagram

Multifunctional power supply circuit diagram of a portable telephone composed of RS5VE

Remote control anti-theft alarm circuit controlled by PIC microcontroller

Driving a light-emitting diode with a basic monostable circuit

Computer motherboard circuit diagram 810 3_10

【Quadcopter】Jiangsu University of Science and Technology: The quadcopter of Jiangsu University of Science and Technology is for your reference[flash]http://player.youku.com/player.php/sid/XMTc3ODQyODUy/v.swf[/flash][[i] This post was last edited by Xinhai Ba...; 鑫海宝贝 MCU

How to use the three pins VDSYS, DVSYS and VASYS of MSP430F6726?: What are the VDSYS, DVSYS, and VASYS of MSP430F6726? The datasheet says that an external capacitor is required, and the recommended value is 4.7uF. How do these three pins select between VCC, AUXVCC1,...; rachelgao Microcontroller MCU

MicroPython has solved the ESP32's NeoPixel display bug: With the update of https://github.com/micropython/micropython/pull/7985 , the occasional random flash bug of neopixel display has been perfectly solved in the latest esp32 daily build firmware (esp32-...; dcexpert MicroPython Open Source section

MSP430F149 small system development board realizes RS232 serial communication: /********************************************************Program function: MCU keeps sending data to PC, and displaysASCII characters corresponding to 0~127 on the screen------------------------------...; fish001 Microcontroller MCU

The inspiration brought by the “Apple model” to LED lighting companies: I am forwarding an article with interesting views. Everyone appreciates it. With the global popularity of Apple products, everyone has gradually realized that consumers' consumption concepts are incre...; qwqwqw2088 LED Zone

Fluke 101KIT received, PP: Thanks for the Fluke from the forum! Thanks to the forum! Although the picture is not very clear because it was taken with a mobile phone...; pleasemissme Talking

Shortcut: E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF EG EH EI EJ EK EL EM EN EO EP EQ ER ES ET EU EV EW EX EY EZ F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF FG FH FI FJ FK FL FM FN FO FP FQ FR FS FT FU FV FW FX FY FZ G0 G1 G2 G3 G4 G5 G6 G7 G8 G9 GA GB GC GD GE GF GG GH GI GJ GK GL GM GN GO GP GQ GR GS GT GU GV GW GX GZ H0 H1 H2 H3 H4 H5 H6 H7 H8 HA HB HC HD HE HF HG HH HI HJ HK HL HM HN HO HP HQ HR HS HT HU HV HW HX HY HZ I1 I2 I3 I4 I5 I6 I7 IA IB IC ID IE IF IG IH II IK IL IM IN IO IP IQ IR IS IT IU IV IW IX J0 J1 J2 J6 J7 JA JB JC JD JE JF JG JH JJ JK JL JM JN JP JQ JR JS JT JV JW JX JZ K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 KA KB KC KD KE KF KG KH KI KJ KK KL KM KN KO KP KQ KR KS KT KU KV KW KX KY KZ

Popular Components