CMX865A

CMX865A Telecom Signalling Device D/865A/3 February 2007 Provisional Issue CMX865A – DTMF CODEC AND TELECOM SIGNALLING COMBO Features V.23 1200/75, 1200/1200, 75, 1200 bps FSK Bell 202 1200/150, 1200/1200, 150, 1200 bps FSK V.21 or Bell 103 300/300 bps FSK Low Voice Falsing DTMF Decoder DTMF/Tones Transmit and Receive Low Power - High Performance Applications Wireless Local Loops SMS Phones Security Systems Remote Utility Meter Reading Industrial Control Systems Pay-Phones Set-Top Boxes CMX865A TX USART FSK MODULATOR www.DataSheet4U.com TONE / DTMF GENERATOR RX USART FSK RECEIVER TONE / DTMF DETECTOR LINE LINE INTERFACE C-BUS SERIAL INTERFACE HOST µC 1. Brief Description The CMX865A is a multi-standard modem for use in Wireless Local Loop, Short Message Service telephone based information and telemetry systems. Flexible line driver, hybrid and receiver circuits are integrated on chip, requiring only passive external components to build a 2 or 4-wire line interface. 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, simple melodies, call progress signals or modem calling and answering tones. Host control and data transfer is via a high-speed serial bus that operates in normal and Powersave modes and which is compatible with most simple types of µC serial interfac...