CMX860 View Datasheet(PDF) - CML Microsystems Plc

Part Name

Description

Manufacturer

CMX860

Telephone Signalling Transceiver

CML Microsystems Plc 

CMX860

Telephone Signalling

Transceiver

D/860/5 January 2002

Features

• V.23 & Bell 202 FSK Tx and Rx

• DTMF/Tones Transmit and Receive

• Line and Phone Complementary Drivers

• Call Progress Decoder

• Dual Tone Detection and Generation

• Simple 'C-BUS' Serial Interface

• Low Power Operation

• ‘Powersave’ Standby Mode

Provisional Issue

Applications

• Least Cost Routers

• Vending Machines

• Internet Appliances

• Home Management Systems

• Remote Meter Reading

• Alarm Systems

• Cable TV Set-Top Boxes

• Advanced Feature Phones

1.1 Brief Description

The CMX860 is a flexible, low-power Telephone Signalling Transceiver IC, designed for use in a wide

range of line-powered telephone equipment. The IC combines the functions of a DTMF encoder and

decoder, V.23 / Bell 202 modulator and demodulator plus call progression circuitry with analogue

switching between line and phone interfaces. Ring detection, local phone off-hook detection and a relay

driver for line hook-switch operation are also provided under the control of 'C-BUS'. The ring and hook

detectors operate whilst the remainder of the IC is powersaved, generating an interrupt to wake-up the

host µC when further processing or signalling is required.

All on-chip functions and switching arrangements are controlled via a serial bus ('C-BUS'). The CMX860

is designed to operate at 2.7V and utilises CML’s low power DTMF decoder and V.23 / Bell 202 modem

technology. It is available in 28-pin SOIC (D1), TSSOP (E1) and SSOP (D6) packages.

© 2002 Consumer Microcircuits Limited

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