CMX868 参数 Datasheet PDF下载

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........................................................................... 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

General Reset Command.............................. 18

1.5.10.2

General Control Register.............................. 20

1.5.10.3

Transmit Mode Register ............................... 22

1.5.10.4

Receive Mode Register ................................. 26

1.5.10.5

Tx Data Register............................................ 28

1.5.10.6

Rx Data Register ........................................... 28

1.5.10.7

Status Register.............................................. 29

1.5.10.8

Programming Register.................................. 32

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

1.5

1.6

1.7

©

2004 CML Microsystems Plc

2

D/868/9