器件名称: CMX624P4
功能描述: V.23 / Bell 202 Modem
文件大小: 707.26KB 共26页
简 介:CML Microcircuits
COMMUNICA TION SEMICONDUCTORS
D/624/7 September 2003
CMX624
V.23 / Bell 202 Modem
Applications
Telephone Telemetry Systems Remote Utility Meter Reading Security Systems/Cash Terminals Industrial Control Systems Pay-Phones Cable TV Set-Top Boxes
Features
V.23 / Bell 202 Compatible Modem Integrated DTMF Encoder Call Progress Tone Detection Line Reversal and Ring Detector Low Power Operation (2.7V) Part of the CMX6x4 Modem Series
1.1
Brief Description
The CMX624 V.23 / Bell 202 modem is intended for use in any telephone based information and telemetry system with low power requirements. Using FSK signalling, fast call set-up times and robust error resistant transmission can be implemented by efficient low power circuits. The circuit can operate at 1200bps full duplex over a 4-wire circuit or 1200 bps plus low speed data over a 2-wire circuit. Flexible line driver and receive hybrid circuitry are integrated on chip requiring only passive external components to build a 2- or 4wire interface. A low impedance pull down output is provided for a hook relay. Control of the device is via a simple high speed serial bus; this allows easy interfacing to a host Controller. The data transmitted and received by the modem is also transferred over the same high speed serial bus. On-chip programmable Tx and Rx UARTs allow asynchronous data to be simultaneously encoded and decoded. Either UART may be disabled to allow 8-bit raw data to be received or transmitted……
