ST952

ST952 D.A.A. LINE INTERFACE . . . . . . . . . . . . . . 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 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. 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 capacitive isolation barrier. Before starting a line connectio...