CMX860

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




Application

· Least Cost Routers
· Vending Machines
· Internet Appliances
· Home Management Systems
· Remote Meter Reading
· Alarm Systems
· Cable TV Set-Top Boxes
· Advanced Feature Phones




Description

The CMX860 is a flexible, low-power Telephone Signalling Transceiver IC, designed for use in a wide range of line-powered telephone equipment. CMX860 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. CMX860 is available in 28-pin SOIC (D1), TSSOP (E1) and SSOP (D6) packages.