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ST952TQF7 Datasheet

  • ST952TQF7

  • D.A.A. LINE INTERFACE

  • 12頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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ST952
D.A.A. LINE INTERFACE
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PRELIMINARY DATA
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
TQFP32
(7 x 7 x 1.4mm)
(Thin Plastic Quad Flat Pack)
ORDER CODE :
ST952TQF7
APPLICATIONS
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
DESCRIPTION
ST952 is a line interface designed to implement
Modem application up to 56Kbps and Voice appli-
cations.
ST952 interfaces between telephone line and ca-
pacitive isolation barrier.
A complete D.A.A. is made with ST75951 which
interfaces between capacitive isolation barrier and
the DSP or HSP signals.
Tip
Digital
ST75951
Signals
ST952
952-02.EPS
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 ca-
pacitive 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.
PIN CONNECTIONS
VDREF
TER2
COM
IREF
OHC
IDC
NC
NC
16 15 14 13 12 11 10 9
TER1
SET
VDR
LINE
IDG
IDI
LINI
GAIN
17
18
19
20
21
22
23
24
25 26 27 28 29 30 31 32
8
7
6
5
4
3
2
1
LIM1
LIM2
TOFF
D6
D5
RIN
D4
D3
Ring
It incorporates Krypton Isolation Inc. patented sili-
con DAA technology.
The ring burst signal is detected by ST952 and is sent
to ST75951 through the capacitive isolation barrier.
Using the control signals given by ST75951, through
the capacitive isolation barrier, ST952 activates the
off-hook or the CLID external transistor switch.
December 1998
1/12
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
952-01.EPS
LCOM
LCOM
AOUT
AIN
NC
NC
D1
D2

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