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DAC81408EVM: Channels stopped working

Sreeraj S J
Prodigy 10 points

Part Number: DAC81408EVM

I have been using this DAC-EVM for some time, and all the ports were working fine. Recently I see that THREE out of EIGHT channels are not working. 

Channels 02, 06 and 07 are giving voltages -10V, -10V and 10V respectively. My VSS and VCC voltages are -10 V and 10 V, for I am using them at ±10V range operation. 

Could this be a hardware problem? 
Did anyone experience multiple channel failures before? 

Codes are proper, all registers are set properly. And these channels worked before. Hence I am ruling out script errors from the list of causes. 

I am using code functions from Matlab via RaspberryPi for programming. 

  • 0
    TI__Intellectual 1755 points

    Hello, 

    Please allow me some time to take a look at the problem and figure out a possible solution.

    Thank you,

    Illia Volkov 

  • 0
    TI__Intellectual 1755 points

    Hello Sreeraj, 

    Thank you for your patience. 

    I does the device respond to SPI command? Could you try to send a different SPI command to see if device responds. 

    How are you using the device, do you have an overview of the device connection or some sort of schematic I could take a look at? 

    What are the configurations of the DAC are you using? 

    Do you have a different device/EVM that you could try to replace to see if it works? 

    Thank you, 

    Illia Volkov