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CMX264D5 View Datasheet(PDF) - MX-COM Inc

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CMX264D5 Datasheet PDF : 22 Pages
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Frequency Domain Split-Band Scrambler
Section
2
CONTENTS
CMX264 Advance Information
Page
1 Block Diagram................................................................................................................ 4
2 Signal List....................................................................................................................... 5
3 External Components .................................................................................................... 6
4 General Description....................................................................................................... 7
4.1 Tx Channel .......................................................................................................................... 7
4.1.1 Tx Channel Pre-Emphasis ..................................................................................................... 7
4.1.2 Tx Lowerband Input Filter (TXLBIPF)..................................................................................... 7
4.1.3 Tx Lowerband Balanced Modulator........................................................................................ 7
4.1.4 Tx Lowerband Output Filter (TXLBOPF) ................................................................................ 7
4.1.5 Tx Upperband Input Filter (TXUBIPF) .................................................................................... 7
4.1.6 Upperband Balanced Modulator............................................................................................. 7
4.1.7 Tx Upperband Output Filter (TXUBOPF) ............................................................................... 8
4.1.8 Tx Summer............................................................................................................................. 8
4.1.9 Tx Channel De-Emphasis ...................................................................................................... 8
4.2 Rx Channel.......................................................................................................................... 8
4.2.1 Rx Channel Pre-Emphasis ..................................................................................................... 8
4.2.2 Rx Lowerband Input Filter (RXLBIPF).................................................................................... 8
4.2.3 Rx Lowerband Balanced Modulator ....................................................................................... 8
4.2.4 Rx Lowerband Output Filter (RXLBOPF) ............................................................................... 8
4.2.5 Rx Upperband Input Filter (RXUBIPF) ................................................................................... 8
4.2.6 Rx Upperband Balanced Modulator ....................................................................................... 8
4.2.7 Rx Upperband Output Filter (RXUBOPF)............................................................................... 9
4.2.8 Rx Summer ............................................................................................................................ 9
4.2.9 Rx Channel De-Emphasis ...................................................................................................... 9
4.3 Serial Interface .................................................................................................................... 9
4.3.1 General Operation.................................................................................................................. 9
4.3.2 Powersave Mode (D10).......................................................................................................... 9
4.3.3 Clear/Scramble Modes (D9)................................................................................................... 9
4.3.4 Output Select (D8, D7, D6) .................................................................................................. 10
4.3.5 Pre/De-Emphasis Select (D5, D4, D3, D2) .......................................................................... 11
4.3.6 Scramble Mode - Split Point Selection (D1, D0) .................................................................. 11
5 Application Notes ........................................................................................................ 11
5.1 General Use ...................................................................................................................... 11
5.2 Input Anti-Alias and Output Smoothing Filters................................................................... 12
5.2.1 Input Anti-Alias Filtering ....................................................................................................... 12
5.2.2 Output Smoothing ................................................................................................................ 12
2000 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480210.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
 

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