CMX980AL7 CML Microcircuits, CMX980AL7 Datasheet - Page 2

• Manufacturer Part Number: CMX980AL7
• Description: TETRA Baseband Processor
• Manufacturer: CML Microcircuits

TETRA Baseband Processor
1.0 FEATURES ....................................................................................................................................... 1
1.1 BRIEF DESCRIPTION....................................................................................................................... 1
1.2 BLOCK DIAGRAM ............................................................................................................................ 5
1.3 SIGNAL LIST .................................................................................................................................... 6
1.4 EXTERNAL COMPONENTS ............................................................................................................. 8
1.5 GENERAL DESCRIPTION ................................................................................................................ 9
1.6 APPLICATION NOTES ................................................................................................................... 85
1999 Consumer Microcircuits Limited
1.5.1 Connection and Decoupling of Power Supplies................................................................... 9
1.5.2 Programmable FIR filter Architecture .................................................................................. 10
1.5.3 Tx Data Path .......................................................................................................................... 11
1.5.3.1 Modulator............................................................................................................................ 11
1.5.3.2 Filters.................................................................................................................................. 11
1.5.3.3 Gain Multiplier ...................................................................................................................... 11
1.5.3.4 Offset Adjust ........................................................................................................................ 11
1.5.3.5 Sigma-Delta D-A Converters and Reconstruction Filters....................................................... 11
1.5.3.6 Phase Pre-distortion............................................................................................................. 11
1.5.3.7 Ramping Output Amplitude .................................................................................................. 11
1.5.3.8 Symbol Clock Phase Adjustment.......................................................................................... 12
1.5.3.9 Direct Write to Tx 79-tap Filter Input..................................................................................... 12
1.5.3.10 Test Access to DAC Input .................................................................................................. 12
1.5.4 Rx Data Path.......................................................................................................................... 13
1.5.4.1 Anti-Alias Filtering and Sigma-Delta A-D Converters ............................................................ 13
1.5.4.2 Rx FIR Filters....................................................................................................................... 13
1.5.4.3 Offset Registers ................................................................................................................... 13
1.5.4.4 I and Q Channel Gain........................................................................................................... 13
1.5.5 Auxiliary Circuits .................................................................................................................. 14
1.5.5.1 10-Bit DACs ......................................................................................................................... 14
1.5.5.2 10-Bit ADC........................................................................................................................... 14
1.5.5.3 Power Ramping and Control................................................................................................. 14
1.5.6 IRQ Function ......................................................................................................................... 14
1.5.7 Serial Interface ...................................................................................................................... 15
1.5.7.1 Command Interface.............................................................................................................. 16
1.5.7.2 Command Read Interface .................................................................................................... 16
1.5.7.3 Rx Data Interface ................................................................................................................. 16
1.5.7.4 Transmission of Data ........................................................................................................... 16
1.5.7.5 Command Control Serial Word............................................................................................. 18
1.5.7.6 Coefficient Memory .............................................................................................................. 20
1.5.7.7 Auto Power Save Mode........................................................................................................ 20
1.5.8 Register Description ............................................................................................................. 21
1.5.8.1 Register and Access Point Summary ................................................................................... 22
1.6.1 Interrupt Handling................................................................................................................. 85
1.6.2 Configuration ........................................................................................................................ 85
1.6.3 Reset...................................................................................................................................... 85
1.6.4 Developing and Optimising FIR Filter Coefficients ............................................................ 85
Section
CONTENTS
2
CMX980A
D/980A/3
Page