Test Points - Texas Instruments ADC36 EVMCVAL Series User Manual

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3.3 Interfaces
There are two key interfaces involved with the setup of this EVM. The first is directly on the EVM
located at J16 on the bottom of the board. J16 is an FMC connector and interfaces with J1 on the
ADC3683_TSW1400_Interposer_RevA (Interposer Card). The other side of the interposer card, J2 (directly
across from J1), interfaces with J3 of the TSW1400EVM via an HSMC connector (bottom side of the board).

3.4 Test Points

The EVM has nine test points located on the board. There are four GND test points, one VREF test point, one
REFBUF test point, one AVDD_SENSE test point, and one DVDD_SENSE test point.
The VREF test point is used to supply 3.3 V to the on board REF35160QDBVR Precision Voltage Reference.
This chip is what supplies the ADC a 1.6 V external reference.
The REFBUF test point is not used in the default configuration. The REFBUF pin voltage can control the
reference to the part if desired as opposed to doing this via SPI.
The AVDD_SENSE and IOVDD_SENSE test points are not used in the default configuration. These test points
can be used when supplying AVDD and IOVDD independently (needs a board modification to accomplish this) to
verify precise supply voltage.
3.5 Setup
Before setup, make sure the necessary software is downloaded and installed, as described in
ahead and open HSDC Pro and ADC35XX EVM GUI.
As an additional note, there are not any jumpers or headers that need to be checked or addressed.
First, connect the FMC data interface of the ADC36xxEVMCVAL (J16) to J1 of the LVDS interposer card
(ADC3683_TSW1400_Interposer_RevA). Then, connect the HSMC interface of the LVDS interposer card to J3
of the TSW1400EVM.
Connect one mini-USB cable to the TSW1400EVM (J5) and another mini-USB cable to the ADC36xxEVMCVAL
(J17).
Connect 5 V (4 A capable supply) to J12 of the TSW1400EVM. Turn the TSW1400EVM on using SW7.
Connect 5 V (1 A capable supply) banana jack to J18 of the ADC36xxEVMCVAL and the corresponding ground
banana jack to J2 or J3 of the EVM. Turn the power supply on.
Connect 3.3 V (1 A capable supply) via a clip to VREF test point on the ADC36xxEVMCVAL and the
corresponding ground clip to the most convenient GND test point on the EVM. Turn the power supply on.
Using a multi-meter, set the measure to volts (DC) and verify the following test points have the following voltage
levels on the ADC36xxEVMCVAL.
Test Point
Also using the multi-meter and the same settings above, verify the voltage at the node between R56 and C44
(bottom side of the board) is +1.6 VDC +/- 0.1 V. This is the voltage to be supplied as the external reference to
the part. See the images below for reference to this location.
SBAU446 – DECEMBER 2023
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IOVDD
AVDD
VREF
Copyright © 2023 Texas Instruments Incorporated
Section 2. Go
Voltage (V)
+1.8 VDC +/- 0.1 V
+1.8 VDC +/- 0.1 V
+3.3 VDC +/- 0.1 V
ADC36xxEVMCVAL Evaluation Module
Hardware
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