Testing the EVM Data Capture With LVDS
8
SLOU430A – December 2015 – Revised February 2016
Copyright © 2015–2016, Texas Instruments Incorporated
AFE5818 16-Channel Analog Front End Evaluation Module (EVM Rev. C)
4
Testing the EVM Data Capture With LVDS
This section outlines (1) the external connections required to test the AFE5818 EVM using the LVDS
interface, (2) how to setup the GUIs for testing, and (3) how to capture an analog input signal.
4.1
EVM Hardware Setup
Make the connections shown in
or for proper hardware setup.
Figure 4. TSW1400EVM and AFE5818 EVM Hardware Setup for LVDS Capture
1.
Board Mating:
For LVDS data, mate the TSW1400 EVM at connector
J3
to the AFE5818 EVM at
connector
J59
through the high-speed ADC interface connector.
2.
Power Supply:
Connect a 5-V (2-A) power supply using the provided power cable to
J12 (+5V_IN)
of
the TSW1400 EVM. See the TSW manual for more information, if needed.
Next, connect a 5-V (2-A) power supply using the provided power cable to
J1
of the AFE5818 EVM.
Connect the white-striped side of this cable to the 5-V power supply.
Optionally, connect a –5-V
(1-A) supply at J3 or TP3 if using the CW or Vcntl circuit. No cable is provided for this.
Turn on the TSW1400 at the SW7 switch.
3.
USB:
After installing the GUIs as shown in
, connect the USB cable from PC to
J5 (USB)
located on the top side of the AFE5818 EVM. Connect the USB cable from PC to
J5 (USB_IF)
of the
TSW1400 EVM. USB 2.0 or 3.0 ports are both acceptable for both EVMs.
Note: TI recommends that
the PC USB port be able to support USB2.0. If unsure, always choose the USB ports at the back of the
PC chassis over ones located on the front or sides.
4.
Equipment:
Connect a sine wave generator to SMA
J6, INP1
. Set the frequency to 5 MHz and the
amplitude to –30 dBm. For best performance, a 5-MHz band-pass filter (BPF) is recommended on the
analog input signal to attenuate the harmonics and noise from the signal.
