CMX865A Telecom Signalling Device D/865A/5 May 2012 CMX865A DTMF CODEC AND TELECOM SIGNALLING COMBO Features Applications V.23 1200/75, 1200/1200, 75, 1200 bps FSK Wireless Local Loops Bell 202 1200/150, 1200/1200, 150, 1200 bps FSK SMS Phones V.21 or Bell 103 300/300 bps FSK Security Systems Low Voice Falsing DTMF Decoder Remote Utility Meter Reading DTMF/Tones Transmit and Receive Industrial Control Systems Low Power - High Performance Pay-Phones Set-Top Boxes CMX865A TX USART FSK MODULATOR TONE / DTMF GENERATOR C-BUS HOST LINE LINE SERIAL C INTERFACE INTERFACE RX USART FSK RECEIVER TONE / DTMF DETECTOR 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 C serial interface. An embedded USART allows multi-format asynchronous data and unformatted synchronous data to be received or transmitted as 8-bit bytes. The CMX865A operates from a single 3.0V to 3.6V supply over a temperature range of -40C to +85C and is available in 16-pin SOIC (D4) and 16-pin TSSOP (E4) packages. 2012 CML Microsystems Plc Telecom Signalling Device CMX865A CONTENTS Section Page 1. Brief Description ..................................................................................... 1 2. Block Diagram ......................................................................................... 3 3. Signal List ................................................................................................ 4 4. External Components ............................................................................. 5 4.1. Line Interface (DAA) .................................................................... 6 4.1.1. 2-Wire Line Interface ....................................................... 6 4.1.2. 4-Wire Line Interface ....................................................... 7 4.1.3. Wireless Local Loop Interface......................................... 8 5. General Description ................................................................................ 9 5.1. TXA/TXAN Differential Output ................................................... 10 5.2. Tx USART .................................................................................. 10 5.3. FSK Modulator ........................................................................... 11 5.4. Tx Filter and Equaliser ............................................................... 11 5.5. DTMF/Tone Generator ............................................................... 11 5.6. Tx Level Control and Output Buffer ........................................... 11 5.7. Rx DTMF/Tones Detectors ........................................................ 12 5.8. Rx Modem Filtering and Demodulation ..................................... 12 5.9. Rx Modem Pattern Detectors ..................................................... 14 5.10. Rx Data Register and USART ................................................... 14 5.11. C-BUS Interface ......................................................................... 15 5.11.1. General Reset Command ............................................. 17 5.11.2. General Control Register .............................................. 17 5.11.3. Transmit Mode Register ................................................ 19 5.11.4. Receive Mode Register ................................................. 22 5.11.5. Tx Data Register ........................................................... 23 5.11.6. Rx Data Register ........................................................... 24 5.11.7. Status Register ............................................................. 24 5.11.8. Programming Register .................................................. 28 6. Application Notes .................................................................................. 31 6.1. Simple voice record and playback on the CMX865A................. 31 6.2. Mixing external signals such as voice onto the transmit path .... 34 6.3. Receiving on-hook Caller-ID ...................................................... 34 7. Performance Specification ................................................................... 36 7.1. Electrical Performance ............................................................... 36 7.1.1. Absolute Maximum Ratings .......................................... 36 7.1.2. Operating Limits ............................................................ 36 7.1.3. Operating Characteristics ............................................. 37 7.2. Packaging .................................................................................. 44 Table Page Table 1 TXA/TXAN state with selected operating mode ..................................... 10 Table 2 Status Register....................................................................................... 25 Table 3 Received DTMF Code: Status Register b3-0 ........................................ 27 Table 4 Programming Register: Filter Coefficients ............................................. 30 It is always recommended that you check for the latest product datasheet version from the Datasheets page of the CML website: www.cmlmicro.com . 2012 CML Microsystems Plc 2 D/865A/5