Fully integrated analog telephone

摘要: The maximum integrated phone (MIP) combines the signaling and speech functions for analog subset applications in a single circuit using 2.4- mu m CMOS technology. device can handle both dual-tone multiple-frequency decadic dialing. A ten-number repertory last-number redial function are included. loudspeaker amplifier allows call progress monitoring during on-hook Background-noise-reduction circuitry is included transmit path to achieve noise performance of -72 dBV/sub p/ with 50-dB gain. Power extracted from line terminals by synthesized high-impedance current source. chip 17-mm/sup 2/ presented 40-pin dual in-line package. >