CMX980AL7 Просмотр технического описания (PDF) - MX-COM Inc
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CMX980AL7 Datasheet PDF : 82 Pages
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Digital Radio Baseband Processor
Section
2
CONTENTS
CMX980A Advance Information
Page
1 Block Diagram................................................................................................................ 4
2 Signal List....................................................................................................................... 5
3 External Components.................................................................................................... 7
3.1 Rx Inputs ............................................................................................................................. 7
3.2 Tx Outputs ........................................................................................................................... 7
4 General Description....................................................................................................... 8
4.1 Connection and Decoupling of Power Supplies .................................................................. 8
4.2 Programmable FIR Filter Architecture ................................................................................. 9
4.3 Tx Data Path........................................................................................................................ 9
4.3.1 Modulator ............................................................................................................................. 10
4.3.2 Filters.................................................................................................................................... 10
4.3.3 Gain Multiplier ...................................................................................................................... 10
4.3.4 Offset Adjust......................................................................................................................... 10
4.3.5 Sigma-Delta D-A Converters and Reconstruction Filters ..................................................... 10
4.3.6 Phase Pre-distortion............................................................................................................. 10
4.3.7 Ramping Output Amplitude .................................................................................................. 10
4.3.8 Symbol Clock Phase Adjustment ......................................................................................... 11
4.3.9 1.5.3.9 Direct Write to Tx 79-tap Filter Input ........................................................................ 11
4.3.10 Test Access to DAC Input .................................................................................................... 11
4.4 Rx Data Path ..................................................................................................................... 11
4.4.1 Anti-Alias Filtering and Sigma-Delta A-D Converters........................................................... 11
4.4.2 Rx FIR Filters ....................................................................................................................... 11
4.4.3 Offset Registers.................................................................................................................... 12
4.4.4 I and Q Channel Gain........................................................................................................... 12
4.5 Auxiliary Circuits ................................................................................................................ 12
4.5.1 10-Bit DACs.......................................................................................................................... 12
4.5.2 10-Bit ADC ........................................................................................................................... 12
4.5.3 Power Ramping and Control ................................................................................................ 12
4.6 IRQ Function ..................................................................................................................... 12
4.7 Serial Interface .................................................................................................................. 13
4.7.1 Command Interface.............................................................................................................. 14
4.7.2 Command Read Interface .................................................................................................... 14
4.7.3 Rx Data Interface ................................................................................................................. 14
4.7.4 Transmission of Data ........................................................................................................... 15
4.7.5 Command Control Serial Word ............................................................................................ 16
4.7.6 Coefficient Memory .............................................................................................................. 17
4.7.7 Auto Power Save Mode........................................................................................................ 18
2000 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. 20480201.001
4800 Bethania Station Road, Winston-Salem, NC 27105-1201, USA
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