Low Power V.22 bis Modem
CMX868
CONTENTS
Section
1.1
1.2
1.3
1.4
Page
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
General Description............................................................................. 9
1.5.1 Tx USART .............................................................................. 10
1.5.2 FSK and QAM/DPSK Modulators ......................................... 11
1.5.3 Tx Filter and Equaliser.......................................................... 12
1.5.4 DTMF/Tone Generator .......................................................... 12
1.5.5 Tx Level Control and Output Buffer..................................... 12
1.5.6 Rx DTMF/Tones Detectors.................................................... 13
1.5.7 Rx Modem Filterering and Demodulation............................ 14
1.5.8 Rx Modem Pattern Detectors and Descrambler .................. 15
1.5.9 Rx Data Register and USART ............................................... 15
1.5.10 C-BUS Interface..................................................................... 17
1.5.10.1
General Reset Command.............................. 17
1.5.10.2
General Control Register.............................. 19
1.5.10.3
Transmit Mode Register ............................... 21
1.5.10.4
Receive Mode Register ................................. 24
1.5.10.5
Tx Data Register............................................ 26
1.5.10.6
Rx Data Register ........................................... 26
1.5.10.7
Status Register.............................................. 27
1.5.10.8
Programming Register.................................. 30
Application Notes .............................................................................. 34
1.6.1 V.22 bis Calling Modem Application .................................... 34
1.6.2 V.22 bis Answering Modem Application.............................. 35
1.6.3 Reference Diagrams.............................................................. 36
Performance Specification................................................................ 37
1.7.1 Electrical Performance.......................................................... 37
1.7.1.1 Absolute Maximum Ratings..................................... 37
1.7.1.2 Operating Limits....................................................... 37
1.7.1.3 Operating Characteristics ........................................ 38
1.7.2 Packaging.............................................................................. 45
1.5
1.6
1.7
©
2002 Consumer Microcircuits Limited
2
D/868/6
CMLMICRO [ CML MICROCIRCUITS ]
