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CML Microcircuits
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CMX867A Datasheet Preview

CMX867A Datasheet

Low Power V.22 Modem

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CMX867A pdf
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX867A
Low Power
V.22 Modem
D/867A/2 September 2006
Features
V.22, Bell 212A 1200/1200 or 600/600 bps DPSK
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
DTMF/Tones Transmit and Receive
‘Powersave’ Standby Mode
Software and Hardware Compatible with CMX868A
Provisional Issue
Applications
Telephone Telemetry Systems
Remote Utility Meter Reading
Security Systems
Industrial Control Systems
Electronic Cash Terminals
Pay-Phones
Set-Top Boxes
1. Brief Description
The CMX867A is a multi-standard modem for use in telephone based information and telemetry systems.
Control of the device is via a simple high speed serial bus, compatible with most types of µC serial
interface. The data transmitted and received by the modem is also transferred over the same serial bus.
On-chip programmable Tx and Rx USARTs meeting the requirements of V.14 are provided for use with
asynchronous data and allow unformatted synchronous data to be received or transmitted as 8-bit words.
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, call progress signals or modem calling and answering tones.
Flexible line driver and receive hybrid circuits are integrated on chip, requiring only passive external
components to build a 2 or 4-wire line interface.
The device also features a Hook Switch Relay Drive output and a Ring Detector circuit which continues to
function when the device is in the Powersave mode, providing an interrupt which can be used to wake up
the host µController when line voltage reversal or ringing is detected.
The CMX867A operates from a single 2.7 to 5.5V supply over a temperature range of -40°C to +85°C and
is available in 24-pin TSSOP, SOIC and DIP packages.
© 2006 Consumer Microcircuits Limited



CML Microcircuits
CML Microcircuits

CMX867A Datasheet Preview

CMX867A Datasheet

Low Power V.22 Modem

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CMX867A pdf
Low Power V.22 Modem
CMX867A
Section
CONTENTS
Page
1. Brief Description ..................................................................................... 1
2. Block Diagram ......................................................................................... 3
3. Signal List ................................................................................................ 4
4. External Components............................................................................. 5
4.1 Ring Detector Interface ............................................................. 6
4.2 Line Interface.............................................................................. 7
5. General Description.............................................................................. 10
5.1 Tx USART.................................................................................. 11
5.2 FSK and DPSK Modulators ..................................................... 12
5.3 Tx Filter and Equaliser ............................................................ 13
5.4 DTMF/Tone Generator ............................................................. 13
5.5 Tx Level Control and Output Buffer....................................... 13
5.6 Rx DTMF/Tones Detectors ...................................................... 14
5.7 Rx Modem Filtering and Demodulation ................................. 15
5.8 Rx Modem Pattern Detectors and Descrambler ................... 16
5.9 Rx Data Register and USART ................................................. 16
5.10 C-BUS Interface........................................................................ 18
5.10.1 General Reset Command ........................................... 18
5.10.2 General Control Register ........................................... 20
5.10.3 Transmit Mode Register ............................................. 22
5.10.4 Receive Mode Register............................................... 26
5.10.5 Tx Data Register.......................................................... 28
5.10.6 Rx Data Register ......................................................... 28
5.10.7 Status Register............................................................ 29
5.10.8 Programming Register ............................................... 32
6. Application Notes ................................................................................. 35
6.1 V.22 Calling Modem Application ............................................ 35
6.2 V.22 Answering Modem Application...................................... 36
6.3 Reference Diagrams ................................................................ 36
7. Performance Specification................................................................... 37
7.1 Electrical Performance ............................................................ 37
7.1.1 Absolute Maximum Ratings....................................... 37
7.1.2 Operating Limits ......................................................... 37
7.1.3 Operating Characteristics.......................................... 38
7.2 Packaging ................................................................................. 45
It is always recommended that you check for the latest product datasheet version from the
Datasheets page of the CML website: [www.cmlmicro.com].
© 2006 Consumer Microcircuits Limited
2
D/867A/2


Part Number CMX867A
Description Low Power V.22 Modem
Maker CML Microcircuits
Total Page 30 Pages
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