CMX878 Ver la hoja de datos (PDF) - CML Microsystems Plc

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CMX878

Line Powered Modem plus DAA

CML Microsystems Plc 

Line Powered Modem plus DAA

CMX878

Section

CONTENTS

Page

1.1 Brief Description.................................................................................. 1

1.2 Block Diagrams ................................................................................... 4

1.3 Signal List ............................................................................................6

1.4 External Components.......................................................................... 8

1.4.1 Ring Detector Interface......................................................... 10

1.4.2 Line-derived Power & Line Interface.................................... 11

1.4.2.1 Standby Regulator................................................................. 11

1.4.2.2 The Regulated Supply & Line Volts Measurement .............. 11

1.4.2.3 Loop Current Control, AC Impedance & Modulation........... 12

1.4.2.4 Rx Hybrid................................................................................ 12

1.4.2.5 Transmit Levels & Receive Thresholds................................ 12

1.5 General Description........................................................................... 16

1.5.1 Tx USART .............................................................................. 17

1.5.2 FSK and QAM/DPSK Modulators ......................................... 18

1.5.3 Tx Filter and Equaliser.......................................................... 19

1.5.4 DTMF/Tone Generator .......................................................... 19

1.5.5 Tx Level Control and Output Buffer..................................... 19

1.5.6 Rx DTMF/Tones Detectors.................................................... 20

1.5.7 Rx Modem Filterering and Demodulation............................ 21

1.5.8 Rx Modem Pattern Detectors and Descrambler .................. 22

1.5.9 Rx Data Register and USART ............................................... 22

1.5.10 DAC 24

1.5.11 ADC 24

1.5.12 C-BUS Interface..................................................................... 26

1.5.12.1

General Reset Command.............................. 29

1.5.12.2

Configuration Register ................................. 29

1.5.12.3

Supplementary Standby Register ................ 30

1.5.12.4

Line/Wakeup Event Register ........................ 30

1.5.12.5

Line Control Register.................................... 31

1.5.12.6

Line Control Register.................................... 31

1.5.12.7

ADC Control Register ................................... 32

1.5.12.8

General Control Register.............................. 33

1.5.12.9

Transmit Mode Register ............................... 35

1.5.12.10

Receive Mode Register ................................. 38

1.5.12.11

Tx Data Register............................................ 40

1.5.12.12

Rx Data Register ........................................... 40

1.5.12.13

Status Register.............................................. 41

1.5.12.14

Programming Register.................................. 44

1.6 Application Notes .............................................................................. 48

1.6.1 Programming Register ............................................. 48

1.6.2 Microprocessor Boot-up Routines .......................... 49

1.6.4 V.22 bis Calling Modem Application .................................... 49

1.6.5 V.22 bis Answering Modem Application.............................. 50

© 2002 Consumer Microcircuits Limited

2

D/878/2

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