Part Number: ADS4129
I can't detect any output clock. I'm using an lvpecl input. The P of this clock signal side can be seen on the follwing image (which follows the 1.6vpp differential):
-The output clock is just two DC values 0.9V and 1.2V.
-The VCM is ok.
-At the moment I don't have and input signal connected and I'm lacking the closest decoupling capacitors.
-I also tried it at higher frequencies (15MHZ,125MHz).
-I didn't use the spi interface yet.
Am I doing something wrong or did I kill de ADS4129?
I am not following. I assume the picture is the input clock and you cannot detect the output clock. You may indeed need to use the SPI to initialize the part properly.
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In reply to RJ Hopper:
I tried using the SPI interface but it's also not working. I double checked all the voltages (DRVDD,AVDD,GND,VCM,pullups/down) and they are ok. The DC voltages from the lvds interface are also present. I also probed the SPI signals to make sure they are accordingly with the datasheet.
Could I, somehow, have damaged the digital part of the chip? Or it's unlikely and I'm just missing something?
In reply to joao presa:
I tested one of our EVM's and I am able to see the output clock right after powering the board. So I am not sure what your issue could be.
Are you checking directly on the clock output pin of the ADC?
In reply to David Chaparro:
Would it be possible to see the schematic for the clock input and output? This would allow us to see if anything else could be causing the issue.
Also, have you checked to make sure you are providing the ADC with the correct power, AVDD and DVDD.
Thank you, David
I managed to solve the problem. I replaced the IC and this time didn't leave the analog input floating. It seems to work now.
If you want I can still share the the schematic for the clock.
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