Low-Power V.32 bis Modem
CMX869B
CONTENTS
Section
1.
2.
3.
4.
Page
Brief Description ..................................................................................... 1
Block Diagram ......................................................................................... 4
Signal List ................................................................................................ 5
External Components............................................................................. 7
4.1
Power Supply Connections ...................................................... 8
4.2
Ring Detector Interface ............................................................. 9
4.3
Line Interface............................................................................ 10
General Description.............................................................................. 12
5.1
Tx USART.................................................................................. 12
5.2
FSK and QAM Modulators....................................................... 15
5.3
Tx Filter and Equaliser ............................................................ 15
5.4
DTMF/Tone Generator ............................................................. 15
5.5
Tx Level Control and Output Buffer....................................... 15
5.6
Rx Level Control ...................................................................... 15
5.7
Rx DTMF/Tones Detectors ...................................................... 15
5.8
Rx Modem Filterering and Demodulation.............................. 16
5.9
Rx Modem Pattern Detectors.................................................. 16
5.10
Rx USART ................................................................................. 17
C-BUS Interface and Software Description........................................ 19
6.1
General Reset Command ........................................................ 21
6.2
General Control Register ........................................................ 21
6.3
Transmit Mode Register .......................................................... 24
6.4
Receive Mode Register............................................................ 28
6.5
QAM Automodem Command Register .................................. 30
6.6
Tx Data Register....................................................................... 31
6.7
Rx Data Register ...................................................................... 32
6.8
Status Register......................................................................... 32
6.9
QAM Automodem Status Register ......................................... 36
6.10
Programming Register ............................................................ 38
Application Notes ................................................................................. 41
Performance Specification................................................................... 42
8.1
Electrical Performance ............................................................ 42
8.1.2 Operating Limits ......................................................... 42
8.1.3 Operating Characteristics.......................................... 43
8.2
Packaging ................................................................................. 48
5.
6.
7.
8.
It is always recommended that you check for the latest product datasheet
version from the Datasheets page of the CML website: [www.cmlmicro.com].
©
2008 CML Microsystems Plc
3
D/869B/3
CMLMICRO [ CML MICROCIRCUITS ]
