Texas Instruments TRF3765 Series, Руководство пользователя, Страница: 2 / 21

Quick-Start Operating Procedures
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1 Quick-Start Operating Procedures
The TRF3765 evaluation module (EVM) is preconfigured to use a 3.3-Vdc power supply on TP2. The
supply must be capable of supplying 250 mA.
SPI communication is required for configuring the TRF3765 device. J7 accepts a mini-USB connector that
can be driven through the device graphical user interface (GUI).
Local oscillator (LO) outputs are available in four differential pairs on SMA coaxial connectors J1, J3-J6,
and J9-J11.
The following steps describe the EVM setup for basic operation with the default hardware configuration.
1. Connect the mini-USB connector. LED D1 draws power through the mini-USB connector and
illuminates immediately.
2. Power the device by supplying TP2 with 3.3 V. Use TP3 for the ground connection. Board revisions
prior to Revision D may require additional power supply connections.
3. Connect the LO output to measurement equipment.
4. Install and start the GUI software.
5. Initiate a communication link with the device by using the GUI Connect button. Follow on-screen
instructions to load a register configuration file. Select file TRF3765.FracMode.3p3Vtank.2600MHz.txt
for a fractional mode board and TRF3765.IntMode.3p3Vtank.2600MHz.txt for an integer mode board.
6. Verify lock-detect on LED D2 and the signal on measurement equipment. If D2 is not illuminated, no
signal is present or the signal is at the incorrect frequency. Check GUI settings on any of the High
Level tabs and recalibrate.
7. Using default hardware and configuration settings, fractional mode integrate phase noise is –47 dBc to
–48 dBc/Hz, whereas integer mode integrated phase is –44 dBc/Hz.
2 Circuit Block Descriptions
This section describes each of the major circuit blocks and their configuration options.
2.1 Test Points
Test points are used throughout the board for control and monitoring. These test points are color-coded
for quick reference. The color codes are described in
Table 1 .
Table 1. Test Point Color Codes
Color Group Reference Designators
Black Ground TP1, TP3, TP4, TP11, TP14, TP27-TP30
White Unregulated supply TP2, TP24
Red Unregulated supply TP5
Purple Regulated supply TP25, TP26
Green VCC and SPI monitor TP6-TP10, TP12, TP13, TP19-TP23
Blue VCC1 monitor TP15-TP18
2 TRF3765 Integer/Fractional-N PLL With Integrated VCO Evaluation Module SLWU076A – November 2011 – Revised July 2012
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