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Contributor
Contributor
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Registered: ‎04-06-2011

ZCU111: RFSoC ADC DAC loopback not working

Hi 

I am attempting to build a simple baremetal design with RFSOC ADC and DAC on ZCU111 boards. Design consists of genreating sine wave, transmittted through DAC and loopbacked with ADC and then through ILA comparing ADC data with DAC. DAC is working as I can see sine wave on external scope but ADC does not seem to be working as what I recieve through ADCs are not expected to be sine wave. I tried sending one digital data ( say D2BF) but what I recieve is no where close to this value ( garbage like FFFF or FC14 or some time 000).  LMX2594 and LMX2408 are configured and up. ADC and DAC's status are "F" which indicate that they are ready to send and sample data.  I run RF Data converter evaluation tool for same ADC and DAC and found working. This indicates that something is going wrong with ADC or it's setup.  I have attached what I am transmitting through DAC and recieving through ADC.

I would appreciate any sugggestion on this.  I have provided required details for the hardware below. Please let me know if any further info is needed. 

Thanks

Vab

Here is my configuration for ADC and DAC : 

For ADC 

Tile 224, Block 0,  ( SMA connector J4 on XM500 daughter card)

ADC_2.png

For DAC

Tile 229, Block 2,  ( SMA connector J5 on XM500 daughter card)

DAC_2.png

J4 and J5 are loopbach with SMA cable provided. 

 

Data send through DAC: 

DAC_SEND.JPG

Data recieved through ADC:

ADC_RECIEVED.JPG

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