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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 and Bell 202 modulator
and demodulator plus call progress 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 the C-BUS command/data
serial bus.
The CMX860 is designed to operate at 2.7V and utilises CML’s low power DTMF decoder
and V.23 modem technology.
