CMX865

CML Microcircuits COMMUNICATION SEMICONDUCTORS D/865/3 November 2005 CMX865 FSK Modem and DTMF Codec Provisional Issue Features V.23 1200/75, 1200/1200, 75, 1200 bps FSK Bell 202 1200/150, 1200/1200, 150, 1200 bps FSK Bell 103 300/300 bps FSK Low Voice Falsing DTMF Decoder DTMF/Tones Transmit and Receive Low Power - High Performance Software and Hardware Compatible with CMX86x Family of Wireline Products Applications Wireless Local Loops SMS Phones Security Systems Remote Utility Meter Reading Industrial Control Systems Pay-Phones Set-Top Boxes www.DataSheet4U.com 1. Brief Description The CMX865 is a multi-standard modem for use in telephone based information and telemetry systems. Control of the device is via a simple high speed serial bus, compatible 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 are provided for use with asynchronous data and allow unformatted synchronous data to be received or transmitted as 8-bit words. A high-quality DTMF decoder with excellent immunity to falsing on voice and a standard DTMF encoder are included. Alternatively, these blocks can be used to transmit and detect user-specific, programmed single and dual-tone signals, call progress signals or modem calling and answering tones. Flexible line driver and receive hybrid circuits are integrated on chip, requiring only passive external comp...