GC5316 Datasheet, PDF (1/75 Pages) Texas Instruments – HIGH-DENSITY DIGITAL DOWNCONVERTER AND UPCONVERTER

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GC5316
SLWS154A − JANUARY 2004 − REVISED MARCH 2004
HIGHĆDENSITY DIGITAL DOWNCONVERTER AND UPCONVERTER
FEATURES
D Optimized for CDMA2000−1X and UMTS
D Up to 12 UMTS or 24 CDMA2000
Downconverter and Upconverter Channels
D Mixed CDMA2000−1X and UMTS Operation
D DDC Input and DUC Output Rates to
125 MSPS
D Any DDC Can Connect to Any of Four Input
Ports
1 Description
D Any DUC Can Sum into Any of Four Output
Ports
D Real/Complex DDC Inputs and DUC Outputs
D Programmable AGC on DDC Outputs
D Rx Filtering: 6 Stage CIC, 48 Tap CFIR, 64 Tap
PFIR
D Tx Filtering: 6 Stage CIC, 47 Tap CFIR, 63 Tap
PFIR
D 115-dB SFDR
D 16-Bit DDC Inputs, 18-Bit DUC Outputs
D 1.5-V Core, 3.3-V I/O
The GC5316 is a high-density multi-channel communications signal processor integrated circuit that provides both
digital downconversion and digital upconversion optimized for cellular base transceiver systems. The device
supports both UMTS and CDMA2000 (CDMA) air interface cellular standards.
The chip provides up to 24 CDMA digital downconverter (DDC) and digital upconverter (DUC) channels or 12 UMTS
DDC and DUC channels. The GC5316 can also support a combination of CDMA and UMTS channels. The DDC and
DUC channels are independent and operate simultaneously.
The chip is ideal for cellular base transceiver systems where a large number of digital radio channels are required.
Each of the 24 CDMA (or 12 UMTS) channels can operate independently. On the DDC side there are four 16 bit input
ports that can accept real or complex input data. The input ports are driven with parallel data, typically from an
analog-to-digital converter. Each downconverter channel can be programmed to accept data from any one of the four
input ports.
On the DUC side, there are four 18-bit output ports. Each output port can sum any of the DUC channels in a
daisy-chain fashion. This permits creating a stack of CDMA or UMTS signals. These ports can output either real or
complex data. Real output data would generally drive one or more D/A converters and output the stack of signals
at an intermediate frequency (IF). Complex data (at baseband or an IF) is used when a quadrature modulator
upconversion scheme is employed. Complex output data can also be used when the output stack is further processed
using crest factor reduction or power amplifier predistortion techniques.
Table of Contents
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5 GC5316 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
2 GC5316 Receive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6 GC5316 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
3 GC5316 Transmit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 7 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4 GC5316 General Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
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semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright  2004, Texas Instruments Incorporated