CMX865 – FSK Modem and DTMF Codec

CMX865 Datasheet PDF learn more.

Part number : CMX865

Functions : This is a kind of semiconductor. FSK Modem and DTMF Codec.

Pin arrangement :

Package information :

Manufacturer : CML

Image :

CMX865 Datasheet PDF

The texts in the PDF file :

CML Microcircuits COMMUNICATION SEMICONDUCTORS D/865/3 November 2005 CMX865 FSK Modem and DTMF Codec Provisional Issue


• 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 1. Brief


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 components to build a 2 or 4-wire line interface. The device also features a Hook Switch Relay Drive output and a Ring Detector circuit which continues to function when the device is in the powersave mode, providing an interrupt which can be used to wake up the host µController when line voltage reversal or ringing is detected. The CMX865 operates from a single 3.0 to 3.6V supply over a temperature range of -40°C to +85°C and is available in a 24-pin SOIC package. © [ … ]

CMX865 PDF File

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