This document is a user's guide for the DAC31x2EVM, an evaluation fixture for the DAC3152 and
DAC3162 (DAC31x2) series of dual-channel, 10-/12-bit, 500-MSPS digital-to-analog converters (DACs).
The DAC31x2EVM includes the TRF3703-33 quadrature modulator to facilitate measuring the output
signals at a desired RF frequency. The EVM also includes the CDCP1803 clock buffer that distributes the
clocks to the DAC, as well as a pattern generator. This EVM is ideally suited for mating with the TSW3100
pattern generation card for evaluating QAM, WCDMA, LTE, or other high-performance modulation
schemes. For more information about the DAC31x2 family, see the product data sheet (available for
download at www.ti.com).
Throughout this document, the acronym EVM and the phrases evaluation module and evaluation fixture
are synonymous with the DAC31x2EVM.
This section outlines the basic procedure for testing the DAC31x2EVM.
2.1Test Set-Up
Figure 2 illustrates the test configuration for general testing of the DAC31x2 with the TSW3100 pattern
generation card.
Testing and Configuration
Figure 2. DAC31x2EVM Test Setup
2.2Test Set-Up Connections
Follow these procedures to properly connect the DAC31x2EVM and the TSW3100 pattern generator.
TSW3100 Pattern Generator:
•Connect a 5-V power supply to J9, the 5V_IN jack of the TSW3100EVM.
•Connect the PC Ethernet port to J13, the Ethernet port of the TSW3100. The cable should be a
standard crossover Cat5e Ethernet cable.
DAC31x2EVM:
•Connect the J5 connector of DAC31x2EVM to connector J74 of the TSW3100EVM.
•Connect 5 V and Ground to connectors J12 and J13 respectively.
•Provide a 0.5-V
•Provide a 7-dBm, 350-MHz to 4-GHz local oscillator (LO) source at port J10 of the DAC31x2EVM. This
input provides the LO source to the TRF3703-33 modulators.
•Connect the RF output port of (J11) to the spectrum analyzer.
DAC31x2EVM Jumpers:
Power distribution to the DAC31x2 and CDCP1803 devices on the EVM can be achieved through
low-dropout regulators (LDOs) or dc-dc converters. Jumpers JP24, JP25, JP26, and JP27 allow the
user to choose one of the power schemes from these two available options. The default setting of
these jumpers is shown; these settings use power management for the ICs through dc-dc switchers.
•JP24 on pin {1,2}
•JP25 on pin {1,2}
•JP26 on pin {1,2}
•JP27 on pin {1,2}
Jumper JP4 supplies power to the TRF3703-33 modulator. This jumper must be installed in order to use
the modulator.
, 500-MHz (max) clock at J9, the CLOCK IN SMA port of the DAC31x2EVM.
RMS
SBOU096A–November 2010–Revised January 2011DAC31x2EVM
Refer to the TSW3100 User’s Guide for a more detailed discussion of how to set up and operate the
TSW3100. This user guide presumes that the TSW3100 software is installed and functioning properly.
CommsSignalPattern Setup from Default Configuration (WCDMA):
Step 1.Change the interpolation value to DAC Clock Rate / 3.84 (that is, 491.52/3.84 = 128).
Step 2.Enter the desired offset frequency (for example, 30 MHz) for each desired carrier.
Step 3.Select the LVDS Output button.
Step 4.Select the Offset Binary option.
Step 5.Check the LOAD and Run box.
Step 6.Press the green Create button.
Figure 3 shows a screenshot of the properly configured TSW3100 software interface.
Follow these steps to set up the DAC31x2EVM and perform a spectrum analysis.
Step 1.Set the clock input to 491.52 MHz at 0.5 V
Step 2.Supply the LO source of 900 MHz (7 dBm) at the J10 SMA connector of the DAC31x2EVM.
Step 3.Turn on power to the board at J12/J13.
Step 4.Verify the spectrum using the Spectrum Analyzer at the RF output of the DAC31x2EVM
(J11).
A typical WCDMA output from a wave analyzer is shown in Figure 4.
RMS
Testing and Configuration
at the J9 SMA connector of the DAC31x2EVM.
Figure 4. DAC3162EVM and TRF3703-33 WCDMA Output
SBOU096A–November 2010–Revised January 2011DAC31x2EVM
Changes from Original (November, 2010) to A Revision ............................................................................................... Page
•Updated abstract to reflect device availability; removed DAC3172 from associated devices .................................. 1
•Updated title of Figure 4 ................................................................................................................. 5
•Changed title of Figure 5 ................................................................................................................ 6
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
SBOU096A–November 2010–Revised January 2011Revision History
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