Texas Instruments GC5325, User Manual, Page: 3 / 35

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Overview
1 Overview
Figure 1. GC5325EVM Block Diagram
The GC5325 SEK consists of the following modules:
• GC5325EVM board (center in Figure A in the GC5325SEK Figures file on the provided CD)
• TSW3100 pattern-generator board (left in Figure A)
The digital portion of the GC5325EVM consist of two GC5325s which are used to generate the DPD
corrected data for two duplicate transmit paths. The control of the GC5325's is provided by a
TMS320C6727 Digital Signal Processor (DSP). The GC5325EVM communicates to a host PC via a
DSP-Weuffen USB-to-UHPI interface board. The system clocking is provided by an onboard VCXO which
is divided by a CDCM7005 to provide the required clocks for the two DACs, the ADC, two GC5325s, the
FPGA, and the TSW3100 pattern generator. The default VCXO is 737.28 MHz, although this can be
substituted with another VCXO or bypassed by using an external clock source.
The radio frequency (RF) portion of the board has two duplicated transmit paths that use a DAC5682Z
(16-bit, 1-GSPS, dual-channel) and TRF3703 for the TX conversion to RF. This is followed by an amplifier,
Digital Step Attenuator (DSA) , and RF switch (for optional onboard loopback to feedback path). The RF
section of the board also features a shared feedback path which consists of RF switches (control shared
feedback), DSA, and a mixer to convert to IF. At the intermediate frequency (IF) portion of the board is an
amplifier, a filter stage, and then the ADS61B49 ADC (14-bit, 250-MSPS).
The baseband input test data is provided by the Texas Instruments TSW3100 pattern generator. This
board communicates with the host PC using a USB-to-Ethernet interface. The GC5325EVM plugs directly
into the TSW3100 as shown in Figure A of the GC5325SEK Figures file on the provided CD. The entire
system is controlled by the GC5325 graphical user interface (GUI) software.
2 Hardware Setup
The setup procedure begins with verifying that all proper connections are made between the various
components of the SEK system. The system is fully controlled by a single host personal computer (PC).
The following list describes connections between the various components of the system including those to
the PC:
The interconnections of various units of the GC5325SEK are as follows:
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MATLAB is a trademark of The MathWorks, Inc..
3 SLWU063F – April 2009 – Revised April 2011 GC5325 System Evaluation Kit
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