Troubleshooting the EVM Setup
3
SNLU210B – July 2016 – Revised December 2017
Copyright © 2016–2017, Texas Instruments Incorporated
DS90UB933-Q1EVM User's Guide
3
Troubleshooting the EVM Setup
1.
Check power supply polarity.
WARNING
Reverse supply polarity can damage the board.
2. Check power over Coax configuration on deserializer board. Make sure correct voltage is applied
(5V<=V
PoC
<=9V). (Refer to Derserializer's user guide for jumper setup)
3. Check to make sure there is sufficient current (500 mA) by checking that the voltage (12 V) is correctly
applied to deserializer using DMM.
4. Check to make sure there is a FPD-Link III signal by probing on both C17 AND C19.
5. Monitor the LOCK signal using oscilloscope on DES board. Do not rely on visual inspection of Lock
LED present on deserializer board.
6. With no PCLK input applied on SER board, PCLK output frequency on DES board should be 50MHz
for the default settings.
Table 1. PCLK Output (on DES) without Applying PCLK Input (on SER)
Mode Selected
PCLK Output Expected
10 bit mode (default mode)
50 MHz
12 bit high frequency mode
37.5 MHz
7. Go back to to double check factory settings.