ST952

Features:

.HOOK SWITCH DRIVER
.RING INDICATOR LINE INTERFACE
  - DC TERMINATION (4V AT 20mA)
  - 2W/4W HYBRID CONVERTER
  - FLAT FREQUENCY RESPONSE DOWN TO
. 10Hz FOR 56Kps MODEM INTERFACE WITH CAPACITIVE ISOLATION
.BARRIER .CALLER ID INTERFACE DIGITAL PHONE LINE OR OVER LOOP
.CURRENT LIMIT DETECT PHONE LINE IN USE CHECK


Application

.MODEMS UP TO V.34, 33.6KBPS AND 56Kbps
.PCMCIA CARDS
.FAX MACHINES
.PERSONAL DIGITAL ASSISTANTS
.ANSWERING MACHINES
.HIGH FEATURE PHONES
.WEBPHONES AND SET TOP BOXES

Pinout




Specifications

Symbol	Parameter	Value	Unit
VMLINE	Positive Line Voltage Continuous	14	V
Toper	Operating Temperature	0, +70	°C
Tstg	Storage Temperature	-55, +150	°C

Description

ST952 is a line interface designed to implement Modem application up to 56Kbps and Voice applications.

ST952 interfaces between telephone line and capacitive isolation barrier.

A complete D.A.A. is made with ST75951 which interfaces between capacitive isolation barrier and the DSP or HSP signals.

If CLID external transistor switch is enabled, a limited amount of current, less than 1mA, is drawn
from the line.

In off-hook state, ST952 DC voltage, 4V at a 20mA line current, allows to interface with most of public
networks in the world.

The return loss is externally adjustable to real or complex impedance.

In case of a wrong connection in a digital phone line, ST952 detects the over current value and sends to ST75951 an alert signal through the capacitive isolation barrier.

Before starting a line connection, ST952 is abled to check if the line is used by an other terminal connected on the same telephone line.