Testing the EVM in CW Mode
16
SLOU430A – December 2015 – Revised February 2016
Copyright © 2015–2016, Texas Instruments Incorporated
AFE5818 16-Channel Analog Front End Evaluation Module (EVM Rev. C)
5
Testing the EVM in CW Mode
Demonstrating the CW mixer in the AFE is done by following these steps:
1. In the HMC-DAQ GUI, initialize the device by pressing the
Initialize Device
button.
Figure 22. Initialize Device
2. Choose "CW: 16x 1.953 MHz"
Figure 23. CW Mode Preset
3. Connect a sine wave generator to SMA
J6, INP1
or any other channel. Set the frequency to 1.963125
MHz and the amplitude to –20 dBm.
4. Connect two cables to an oscilloscope with timebase 40 µs and 500 mV/div. Input resistance should be
50
Ω
on each scope channel.
5. Connect those two cables to SMAs, J53 and J57.
6. The oscilloscope displays the frequency I and Q signals at 10 kHz as shown in
. The
amplitude should be around 1.3 Vpp ±200 mVpp, though this amplitude may change. The frequency
should be 10 kHz and signals should be 90 degrees out of phase.
7. Trigger the oscilloscope on either channel.
