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CML Microcircuits

FX980 Datasheet Preview

FX980 Datasheet

TETRA Baseband Processor

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CML Semiconductor Products
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TETRA Baseband Processor FX980
1.0 Features
D/980/3 November 1997
Advance Information
RRC Filters for both Tx and Rx
π/4 DQPSK Modulation
2x 13-Bit Resolution Sigma Delta D-A
2x 16-Bit Resolution Sigma Delta A-D
4 x10-Bit D-A and 4 Input 10-Bit A-D
Transmit Output Power Control
Low Power 3.0 - 5.5Volt Operation
Effective Power down Modes
1.1 Brief Description
This device is intended to act as an interface between the analogue and digital sections of a Digital Radio
System, and performs many critical and DSP-intensive functions. The chip is designed with the necessary
capability to meet the requirements for use in both mobile and base station applications in Terrestrial Trunked
Radio (TETRA) systems.
The transmit path comprises all the circuitry required to convert digital data into suitably filtered analogue I
and Q signals for subsequent up-conversion and transmission. This includes digital control of the output
amplitudes, digital control of the output offsets and fully programmable digital filters: default coefficients
provide the RRC response required for TETRA.
The receive section accepts differential analogue I and Q signals at baseband and converts these into a
suitably filtered digital form for further processing and data extraction. A facility is provided for digital offset
correction and the digital filters are fully programmable with default coefficients providing the RRC response
required for TETRA.
Auxiliary DAC and ADC functions are included for the control and measurement of the RF section of the radio
system. This may include AFC, AGC, RSSI, or may be used as part of the control system for a Cartesian
Loop.
© 1997 Consumer Microcircuits Limited




CML Microcircuits

FX980 Datasheet Preview

FX980 Datasheet

TETRA Baseband Processor

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TETRA Baseband Processor
FX980
Section
CONTENTS
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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


Part Number FX980
Description TETRA Baseband Processor
Maker CML Microcircuits
Total Page 30 Pages
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