CMX624 데이터 시트보기 (PDF) - MX-COM Inc

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CMX624

Bell 202 and V.23 Modem with Call Progress and DTMF

MX-COM Inc  

Bell 202 and V.23 Compatible Modem

Section

2

CONTENTS

CMX624 Preliminary Information

Page

1 Block Diagram................................................................................................................ 3

2 Signal List....................................................................................................................... 4

3 External Components.................................................................................................... 5

4 General Description....................................................................................................... 6

4.1 ‘C-BUS’ Serial Interface....................................................................................................... 6

4.2 Software Description ........................................................................................................... 7

4.3 Xtal Oscillator ...................................................................................................................... 8

4.4 Rx Input Amplifier ................................................................................................................ 8

4.5 Receive Filter....................................................................................................................... 8

4.6 Equalizer.............................................................................................................................. 8

4.7 FSK Demodulator ................................................................................................................ 9

4.8 Rx Energy and 2100Hz Detector....................................................................................... 10

4.9 FSK / DTMF Modulator...................................................................................................... 10

4.9.1 V.23 mode (Bit 7 of SETUP register = ‘0’):........................................................................... 10

4.9.2 Bell 202 mode (Bit 7 of SETUP register = ‘1’): ..................................................................... 11

4.10 Transmit Filter.................................................................................................................... 12

4.11 Transmit Output Buffer ...................................................................................................... 12

4.12 Ring Signal Detector.......................................................................................................... 12

4.13 Tx/Rx UART ...................................................................................................................... 13

5 Application Notes ........................................................................................................ 15

5.1 Line Interface..................................................................................................................... 15

5.1.1 4-Wire Line Interface ............................................................................................................ 15

5.1.2 2-Wire Line Interface ............................................................................................................ 16

5.2 Ring Detector Interface...................................................................................................... 17

6 Performance Specification.......................................................................................... 19

6.1 Electrical Performance ...................................................................................................... 19

6.1.1 Absolute Maximum Ratings.................................................................................................. 19

6.1.2 Operating Limits ................................................................................................................... 19

6.1.3 Operating Characteristics..................................................................................................... 20

6.1.4 Timing................................................................................................................................... 24

6.2 Packaging.......................................................................................................................... 25

MX-COM, Inc. reserves the right to change specifications at any time and without notice.

©1999 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480180.108

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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