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 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. PIN CONNECTIONS VDREF TER2 COM IREF OHC IDC NC NC 16 15 14 13 12 11 10 9 TER1 SET VDR LINE...
STMicroelectronics
