Low Power V.22 bis Modem
CMX868
CONTENTS
Section
Page
1.1
1.2
1.3
1.4
Brief Description..................................................................................1
Block Diagram .....................................................................................3
Signal List............................................................................................4
External Components..........................................................................5
1.4.1 Ring Detector Interface...........................................................6
1.4.2 Line Interface...........................................................................7
1.5
General Description...........................................................................10
1.5.1 Tx USART ..............................................................................11
1.5.2 FSK and QAM/DPSK Modulators .........................................12
1.5.3 Tx Filter and Equaliser..........................................................13
1.5.4 DTMF/Tone Generator ..........................................................13
1.5.5 Tx Level Control and Output Buffer.....................................13
1.5.6 Rx DTMF/Tones Detectors....................................................14
1.5.7 Rx Modem Filterering and Demodulation............................15
1.5.8 Rx Modem Pattern Detectors and Descrambler ..................16
1.5.9 Rx Data Register and USART ...............................................16
1.5.10 C-BUS Interface.....................................................................18
1.5.10.1
1.5.10.2
1.5.10.3
1.5.10.4
1.5.10.5
1.5.10.6
1.5.10.7
1.5.10.8
General Reset Command..............................18
General Control Register..............................20
Transmit Mode Register ...............................22
Receive Mode Register.................................26
Tx Data Register............................................28
Rx Data Register ...........................................28
Status Register..............................................29
Programming Register..................................32
1.6
1.7
Application Notes..............................................................................36
1.6.1 V.22 bis Calling Modem Application....................................36
1.6.2 V.22 bis Answering Modem Application..............................37
1.6.3 Reference Diagrams..............................................................38
Performance Specification................................................................39
1.7.1 Electrical Performance..........................................................39
1.7.1.1 Absolute Maximum Ratings.....................................39
1.7.1.2 Operating Limits.......................................................39
1.7.1.3 Operating Characteristics ........................................40
1.7.2 Packaging..............................................................................47
ã 2004 CML Microsystems Plc
2
D/868/9
CMLMICRO [ CML MICROCIRCUITS ]
