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AD5672R Daisy chain not working

Hello

I'm currently working on daisy chaining 2 AD5672R DACs together, I've sent in the command(1000 and DB0=1) to enable the daisy chain mode but it doesn't seem to be responding to the command. I've attached a snap of the chipscope signals and i believe it is what is recommended on the datasheet. The first 8 writes are for the first AD5672R and the secnond 8(longer writes) are for the second AD5672R. could you please advice me on the normal process for daisy chaining these DACS. Also not seen in the pics is the LDAC is held low for the duration of the run any help would be great.

Thank you 

attachments.zip
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  • Hi Khanh,

    Thank you for the waveforms!

    Will there be a time that you are going to try or plan to test the first suggested sequence?

    Hello Ivan

     

    that seem to do the trick, i guess since the second chip wasn't in daisy chain mode it didn't know what to do with all the extra bits i was giving. thank you so much for your help

    When this reply was posted, can you confirm what sequence did you use to enable daisy chain mode on DAC_2? is it the first sequence/option that i suggested or a modified sequence? We are very interested with the sequence used.

    In this second picture, it looks like the commands are sent alternately on the two DACs, meaning, when DAC_2 receives a command, DAC_1 is NOP. And when DAC_1 is receiving a command, DAC_2 is NOP. Am I correct?

    Can you share with me if this is really intended by design? have you tried sending commands on both DACs on a the same frame?

    I really appreciate your replies. Thank you!

    Cheers,

    Ivan

Reply
  • Hi Khanh,

    Thank you for the waveforms!

    Will there be a time that you are going to try or plan to test the first suggested sequence?

    Hello Ivan

     

    that seem to do the trick, i guess since the second chip wasn't in daisy chain mode it didn't know what to do with all the extra bits i was giving. thank you so much for your help

    When this reply was posted, can you confirm what sequence did you use to enable daisy chain mode on DAC_2? is it the first sequence/option that i suggested or a modified sequence? We are very interested with the sequence used.

    In this second picture, it looks like the commands are sent alternately on the two DACs, meaning, when DAC_2 receives a command, DAC_1 is NOP. And when DAC_1 is receiving a command, DAC_2 is NOP. Am I correct?

    Can you share with me if this is really intended by design? have you tried sending commands on both DACs on a the same frame?

    I really appreciate your replies. Thank you!

    Cheers,

    Ivan

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