UBA1702

INTEGRATED CIRCUITS DATA SHEET UBA1702; UBA1702A Line interrupter driver and ringer Product specification Supersedes data of 1996 Jan 09 File under Integrated Circuits, IC03 1997 Sep 29 Philips Semiconductors Product specification Line interrupter driver and ringer FEATURES Speech part Driver for the line interrupter that can be either a PMOST when UBA1702 is used or a PNP when UBA1702A is used Adjustable over-current protection Adjustable over-voltage protection for transmission circuit Adjustable mute (dialling mode voltage; DMO or NSA) Adjustable current loop detection (hook switch status) Microcontroller supply Provision for electronic hook switch. Ringer part Over-voltage protection Ringer frequency output for frequency discrimination Adjustable ringer threshold for piezo-driver enable Three bits ringer volume control Bridge-tied-load (BTL) output stage for piezo transducer Fast start-up microcontroller supply. APPLICATIONS Miscellaneous UBA1702; UBA1702A Separated ground pins for transmission circuit interface and control signals (e.g. for TEA1064A) Possibility to supply the microcontroller with an external voltage source. Telephone sets with software controlled ringer function Telephone sets with electronic hook switch. GENERAL DESCRIPTION The UBA1702; UBA1702A performs the high voltage interface and ringer functions of the corded analog telephone set in close cooperation with a microcontroller and transmission circuit. The UBA17...