TETRA Baseband Processor
FX980
CONTENTS
Section
Page
1.0 FEATURES .......................................................................................................................................1
.
1.1 BRIEF DESCRIPTION....................................................................................................................... 1
1.2 BLOCK DIAGRAM ............................................................................................................................ 3
1.3 SIGNAL LIST .................................................................................................................................... 4
1.4 EXTERNAL COMPONENTS ............................................................................................................. 6
1.5 GENERAL DESCRIPTION ................................................................................................................ 7
1.5.1 Connection and Decoupling of Power Supplies...................................................................
7
1.5.2 Tx Data Path
............................................................................................................................ 8
1.5.2.1 Modulator.............................................................................................................................. 8
1.5.2.2 Filters.................................................................................................................................... 8
1.5.2.3 Gain Multiplier ........................................................................................................................ 8
1.5.2.4 Offset Adjust .......................................................................................................................... 8
1.5.2.5 Sigma-Delta D-A Converters and Reconstruction Filters......................................................... 8
1.5.2.6 Phase Pre-distortion............................................................................................................... 8
1.5.2.7 Ramping Output Amplitude .................................................................................................... 8
1.5.3 Rx Data Path............................................................................................................................
9
1.5.3.1 Anti-Alias Filtering and Sigma-Delta A-D Converters .............................................................. 9
1.5.3.2 Filters..................................................................................................................................... 9
1.5.3.3 Offset Registers ..................................................................................................................... 9
1.5.3.4 I and Q Channel Gain............................................................................................................. 9
1.5.4 Auxiliary Circuits
.................................................................................................................... 9
1.5.4.1 10-Bit DACs ........................................................................................................................... 9
1.5.4.2 10-Bit ADC............................................................................................................................. 9
1.5.4.3 Power Ramping and Control................................................................................................. 10
1.5.5 IRQ Function
......................................................................................................................... 10
1.5.6 Serial Interface
...................................................................................................................... 10
1.5.6.1 Command Interface.............................................................................................................. 11
1.5.6.2 Command Read Interface .................................................................................................... 12
1.5.6.3 Rx Data Interface ................................................................................................................. 12
1.5.6.4 Transmission of Data ........................................................................................................... 12
1.5.6.5 Command Control Serial Word............................................................................................. 13
1.5.7 Register Description
............................................................................................................. 14
1.5.7.1 Register and Access Point Summary ................................................................................... 16
1.6 APPLICATION NOTES ................................................................................................................... 33
1.6.1 General................................................................................................................................... 33
1.6.2 Transmitter ............................................................................................................................. 33
1.6.3 Receiver ................................................................................................................................. 33
1.6.4 Timing..................................................................................................................................... 33
1.7 PERFORMANCE SPECIFICATION................................................................................................. 33
1.7.1 Electrical Performance ............................................................................................................ 33
1.7.2 Packaging ............................................................................................................................... 33
Note:
As this product is still in development, it is likely that a number of changes and additions will be made
to this specification. Items marked TBD or left blank will be included in later issues. Information in this
data sheet should not be relied upon for final product design.
©
1997
Consumer Microcircuits Limited
2
D/980/3
CMLMICRO [ CML MICROCIRCUITS ]
