CMX869A Datasheet | CML

Features - V.32 bis/V.32/V.22 bis/V.22 Automodem (14400, 12000, 9600, 7200, 4800, 2400, 1200 bps Duplex) - V.22 bis / V.22 Manual Modem (2400, 1200 bps) - V.23 (1200/75, 1200/1200, 75, 1200 bps FSK) - Bell 202 (1200/150, 1200/1200, 150, 1200 bps FSK) - V.21 or Bell 103 (300/300 bps FSK) - DTMF/Tones Transmit and Receive - ‘Powersave’ Standby Mode - Asynchronous, Synchronous and HDLC Modes Applications Provisional Issue - EPOS Terminals - Telephone Telemetry Systems - Remote Utility Meter Reading - Security Systems - Industrial Control Systems - Electronic Cash Terminals - Pay-Phones - Cable TV Set-Top Boxes 1. Brief Description The CMX869A is a multi-standard modem for use in EPOS terminals, telephone based information and telemetry systems. It can transmit and detect standard DTMF and modem calling and answer signals or user-specific programmed single or dual tone signals. A general purpose Call Progress signal detector is also included. Flexible line driver and receive hybrid circuits are integrated on chip, requiring only passive external ponents to build a 2 or 4-wire line interface. The device features a software controlled hook switch Relay Drive output and a Ring Detector circuit, which continue to function when the device is in Powersave mode. When a line voltage reversal or ringing signal is detected, the Ring Detector Circuit can provide an interrupt which can be used to wake up the host µController. Control of the device is via a simple, high-speed serial bus that operates in normal and Powersave modes, which is patible with most types of µC serial interface. The data transmitted and received by the modem is also transferred over the same serial bus. On-chip programmable Tx and Rx USARTs, patible with V.14, are provided for use with asynchronous data and to allow unformatted synchronous data to be received or transmitted as 8-bit words or received as an HDLC packet. The CMX869A operates from a single 3.3V supply over a temperature range of...