CMX868 查看數據表（PDF） - MX-COM Inc
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CMX868 Datasheet PDF : 43 Pages
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Low Power V.22bis Modem
Section
2
CONTENTS
CMX868 Advance Information
Page
1 Block Diagram ............................................................................................................... 3
2 Signal List ...................................................................................................................... 4
3 External Components ................................................................................................... 5
3.1 Ring Detector Interface.........................................................................................................6
3.2 Line Interface........................................................................................................................7
3.2.1 2-Wire Line Interface .............................................................................................................. 7
3.2.2 4-Wire Line Interface .............................................................................................................. 8
4 General Description ...................................................................................................... 9
4.1 Tx USART ..........................................................................................................................10
4.2 FSK and QAM/DPSK Modulators .......................................................................................11
4.3 Tx Filter and Equalizer........................................................................................................12
4.4 DTMF/Tone Generator .......................................................................................................12
4.5 Tx Level Control and Output Buffer ....................................................................................12
4.6 Rx DTMF/Tones Detectors .................................................................................................12
4.7 Rx Modem Filtering and Demodulation ..............................................................................13
4.8 Rx Modem Pattern Detectors and Descrambler .................................................................14
4.9 Rx Data Register and USART ............................................................................................15
4.10 C-BUS Interface .................................................................................................................16
4.10.1 General Reset Command (no data) C-BUS address $01 .................................................. 17
4.10.2 General Control Register: 16-bit write-only C-BUS address $E0........................................ 18
4.10.3 Transmit Mode Register: 16-bit write-only C-BUS address $E1 ......................................... 19
4.10.4 Receive Mode Register ........................................................................................................ 23
4.10.5 Tx Data Register ................................................................................................................... 25
4.10.6 Rx Data Register................................................................................................................... 25
4.10.7 Status Register: 16-bit read-only C-BUS address $E6 ...................................................... 26
4.10.8 Programming Register.......................................................................................................... 29
5 Application Notes........................................................................................................ 32
5.1 V.22bis Calling Modem Application ....................................................................................32
5.2 V.22bis Answering Modem Application ..............................................................................33
6 Performance Specification ......................................................................................... 34
6.1 Electrical Performance .......................................................................................................34
6.1.1 Absolute Maximum Ratings .................................................................................................. 34
6.1.2 Operating Limits.................................................................................................................... 34
6.1.3 Operating Characteristics ..................................................................................................... 35
6.2 Packaging...........................................................................................................................42
MX-COM, Inc. reserves the right to change specifications at any time and without notice.
¤2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480205.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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