CMX869B CML Microcircuits Low-Power V.32 bis Modem COMMUNICATION SEMICONDUCTORS D/869B/3 May 2008 V.32 bis Automode Modem with V.22 bis Manual Mode Operation and High Performance DTMF Codec Features V.32 bis/V.32/V.22 bis/V.22 Automode Modem EPOS Terminals V.22 bis/V.22 Manual Mode (2400, 1200 bps) Telephone Telemetry Systems V.23 (1200/75, 1200/1200, 75, 1200 bps FSK) Remote Utility Meter Reading Bell 202 (1200/150, 1200/1200, 150, 1200 bps FSK) Security Systems V.21 or Bell 103 (300/300 bps FSK) Industrial Control Systems High Performance DTMF Codec Electronic Cash Terminals Single/Dual Tone Encoders and Decoders Pay-Phones Powersave Standby Mode Cable TV Set-Top Boxes Asynchronous, Synchronous and HDLC Modes CMX869B TX USART & SCRAMBLER. QAM / FSK MODULATOR. TONE / DTMF GENERATOR. C-BUS HOST LINE SERIAL LINE C INTERFACE INTERFACE RX DESCRAMBLER & USART, QAM / FSK RECEIVER. CALL PROGRESS / TONE / DTMF DETECTOR. RING DETECTOR. RELAY DRIVER. 1. Brief Description The CMX869B is a multi-standard modem for use in EPOS terminals and telephone based information and telemetry systems. This highly integrated single-chip modem IC provides the functions needed to construct a ITU V.32 bis automode modem or a V.22 bis, V.22, V.21 and Bell 202, Bell 103 compatible modem operating under the control of external host timing for EPOS and other proprietary protocols. The V.32 bis automode-modem provides operation from 14400 bps with automatic fallback through to 4800 bps, retrain, rate re-negotiation and automatic detection of V.22 and V.22 bis modems. A high-quality DTMF decoder with excellent immunity to falsing on voice and a standard DTMF encoder are included. Alternatively, the device can transmit and detect user-programmed single and dual-tone signals, call progress signals or modem calling and answering tones. 2008 CML Microsystems Plc Low-Power V.32 bis Modem CMX869B The CMX869B features a software controlled output to drive a hook switch relay and a ring detector block that continues to function when the device is in Powersave mode. When a line voltage reversal or ringing signal is detected, the ring detector circuit provides an interrupt that can wake up the host Controller. Line input and line outputs can be single-ended or differential and the line-output amplifier is capable of directly driving into a low-impedance transformer or opto-isolated DAA. The hybrid and gain control circuits are integrated on chip, requiring only passive external components to build a 2- or 4-wire line interface. Host control and data transfer is via a simple, high-speed serial bus that operates in normal and Powersave modes and which is compatible with popular C serial interfaces. An embedded USART accepts multi-format asynchronous data with V.14 support, or allows unformatted synchronous data or HDLC framed data to be received or transmitted. Data transfer can be in either an 8- or 16-bit format. The CMX869B operates from a single 3.3V supply over a temperature range of -40C to +85C and is available in 24-pin TSSOP (E2) and SOIC (D2) packages. 2008 CML Microsystems Plc 2 D/869B/3