Texas Instruments TSW40RF8 Series, Руководство пользователя

Страница: 4 / 20

Quick Start Procedure
www.ti.com
4 SLAU706A – January 2017 – Revised September 2017
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
TSW40RF8x Evaluation Module
4 Quick Start Procedure
4.1 Initial Configuration and DAC Output
Use the following for initial configuration and DAC output:
• Engage the 5-V supply; the initial current should be 1.6 ±0.2 A
• Launch the TSW40RF8x EVM GUI:
– Go to Start → Texas Instruments → TSW40RF8x GUI
NOTE: USB connection is possible only when the power is engaged to the board.
– If needed, press the Connect FTDI? button to establish the USB connection; pressing this button
multiple times may be necessary to get it to engage
• Select the DAC38RF8x tab → Quick Start tab
• Press the LOAD DEFAULT button
NOTE: This loads the file:
2T2R_RevC_ConstInput_12xDec_18xInt_2949p12M_4915p2Gb.cfg
This also loads the proper registers but does not back-fill the values to the ADC tab front
panel. To complete this task go to Low Level tab and press the Read All icon.
Read All does not back-fill the DAC NCO frequency value. If desired, manually go to the
DAC38RF8x tab → DAC38RF8x tab → Digital(DAC A/B) to change NCO Frequency(MHz)
to: 1960.
Read All does not load the actual ADC NCO frequency (the NCO value is loaded). To see
the frequency go to ADC32RFxx tab → ADC32RFxx tab → DDC Configuration tab. Place
cursor in the numerical value and hit a space then enter; the NCO frequency is then
calculated.
This file engages the DAC constant input feature to easily see an output tone without pattern
generation; this must be disengaged when sending a digital pattern to the DAC.
• Press the PLL AUTO TUNE button
• Verify:
– LED D4 and D5 illuminate
– 5-V supply current increases to 3.6 ±0.4 A
• Verify tone output on the spectrum analyzer exists at 1960 MHz at:
– TSW40RF80: –2 ±2 dBm
– TSW40RF82: 0 ±2 dBm