Texas Instruments TRF372017EVM User Manual

The TRF372017 is a high-performance, direct up-conversion device, integrating a high-linear, low-noise IQ
modulator and an integer-fractional PLL/VCO. The device is capable of converting complex modulated
signals from baseband or IF directly up to RF frequencies ranging from 300 MHz to 4.8 GHz. The
PLL/VCO, along with the internal 2/4/8 divider configuration as shown in the following table, is used to
obtain the desired frequency.
VCO Frequency
Part
Number
Fmin
TRF372017 2400
This document outlines the basic procedures for connecting the evaluation module (EVM) to test
equipment for basic testing.
1 Power Requirements
The TRF372017 requires a 3.3-Vdc Vcc power supply through test-point TP2 and 5-Vdc Vcc power supply
through test-point TP5.
Removing jumper JP6 enables the onboard regulator. With the onboard regulator enabled, the 5-V supply
is regulated to provide 3.3 V, and no direct 3.3-V connection through TP2 is required. High-performance
analog measurements must not be performed using the onboard regulator.
2 TRF372017 Operating Procedures for Modulator and Internal VCO Mode
1. Connect the USB to the computer and the mini-USB to the EVM board.
2. Power-supply connections:
(a) Set the 3.3-V supply current limit to 450 mA.
(b) Set the 5-V supply current limit to 200 mA.
(c) Connect the 3.3-V supply to TP2, 5-V supply to TP5, and common ground to TP4.
(d) Switch on the Vcc 3.3-V supply.
(e) Switch on the Vcc 5-V supply.
3. Input connections: Use a DAC or an arbitrary waveform generator to provide I/Q input signals at 1.7
Vdc to J3/J4 and J9/J10. By default, the EVM ac couples the I/Q signals to the device.
4. Output connections:
(a) To measure the PLL output: Connect a spectrum analyzer to the SMA connector marked LON (J1)
or LOP (J5) to monitor the VCO output single-ended. These output nodes can be used for two
purposes:
(i) Check the PLL functionality and measure the frequency range.
(ii) Use the TRF372017 in the PLL/VCO mode alone.
(b) To measure the modulator output: Connect a spectrum analyzer to the SMA connector marked
RF_OUT (J6) to monitor the up-converted signal in the regular operational mode (default mode of
operation).
5. Run the TRF372017 GUI software.
6. Click Reset USB to reset the USB connection.
7. Click on Write All Regs to load the GUI default settings to the device.
8. On start, the LOP and LON outputs and the RF_OUT output are disabled. Enable them as follows:
All trademarks are the property of their respective owners.
SLWU068A – October 2010 – Revised November 2010
Submit Documentation Feedback
Div by 2
Fmax Fmin Fmax
4800 1200 2400
Copyright © 2010, Texas Instruments Incorporated
SLWU068A – October 2010 – Revised November 2010
TRF372017EVM
Div by 4
Fmin Fmax
600 1200
User's Guide
Div by 8
Fmin Fmax
300 600
1
TRF372017EVM