Telephone Signalling Transceiver / Least Cost Router
CMX860
CONTENTS
Section
Page
1.0
1.1
1.2
1.3
1.4
Features and Applications..................................................................3
Brief Description..................................................................................3
Block Diagram .....................................................................................5
Signal List............................................................................................6
External Components..........................................................................8
1.4.1 Ring Detector Interface.........................................................10
1.4.2 Hook Detector Interface........................................................11
1.4.5 RESETN pin...........................................................................11
1.5
General Description...........................................................................12
1.5.1 Tx USART ..............................................................................13
1.5.2 FSK Modulator ......................................................................14
1.5.3 Tx Filter and Equaliser..........................................................14
1.5.4 DTMF/Tones Generator ........................................................14
1.5.5 Tx Level Control and Output Drivers...................................14
1.5.6 DTMF Decoder and Tone Detectors.....................................15
1.5.7 Rx Modem Filter and Equaliser............................................16
1.5.8 FSK Demodulator..................................................................16
1.5.9 Rx Data Register and USART ...............................................16
1.5.10 Rx Modem Pattern Detectors................................................18
1.5.11 Analogue Signal Routing .....................................................18
1.5.12 'C-BUS' Interface...................................................................19
1.5.12.1
1.5.12.2
1.5.12.3
1.5.12.4
1.5.12.5
1.5.12.6
1.5.12.7
1.5.12.8
1.5.12.9
1.5.12.10
General Reset Command..............................19
General Control Register..............................21
Transmit Mode Register ...............................23
Receive Mode Register.................................26
Tx Data Register............................................28
Rx Data Register ...........................................28
Analogue Signal Path Register ....................29
Status Register..............................................30
Programming Register..................................33
Other Registers.............................................35
1.6
1.7
Application Notes..............................................................................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
ã 2002 Consumer Microcircuits Limited
4
D/860/5
CMLMICRO [ CML MICROCIRCUITS ]
