FSK Modem and DTMF Codec
CMX865
CONTENTS
Section
Page
1.
2.
3.
4.
Brief Description.....................................................................................1
Block Diagram.........................................................................................3
Signal List................................................................................................4
External Components.............................................................................5
4.1
4.2
Ring Detector Interface .............................................................6
Line Interface..............................................................................7
5.
General Description..............................................................................10
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
Tx USART..................................................................................11
FSK Modulator .........................................................................12
Tx Filter and Equaliser ............................................................12
DTMF/Tone Generator .............................................................12
Tx Level Control and Output Buffer.......................................12
Rx DTMF/Tones Detectors......................................................13
Rx Modem Filtering and Demodulation.................................14
Rx Modem Pattern Detectors..................................................14
Rx Data Register and USART .................................................15
C-BUS Interface........................................................................16
5.10.1 General Reset Command...........................................16
5.10.2 General Control Register ...........................................18
5.10.3 Transmit Mode Register.............................................20
5.10.4 Receive Mode Register...............................................23
5.10.5 Tx Data Register..........................................................25
5.10.6 Rx Data Register .........................................................25
5.10.7 Status Register............................................................26
5.10.8 Programming Register ...............................................29
6.
7.
Application Notes .................................................................................32
Performance Specification...................................................................33
7.1
Electrical Performance............................................................33
7.1.1 Absolute Maximum Ratings.......................................33
7.1.2 Operating Limits .........................................................33
7.1.3 Operating Characteristics..........................................34
Packaging .................................................................................41
7.2
It is always recommended that you check for the latest product datasheet version from the
Datasheets page of the CML website: [www.cmlmicro.com].
© 2005 CML Microsystems Plc
2
D/865/3
CMLMICRO [ CML MICROCIRCUITS ]
