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AFE7950EVM: Can we set DAC outputs to a constant value (as in DAC38RF80) ?

Khusro Saleem
Prodigy 70 points
Part Number: AFE7950EVM
Other Parts Discussed in Thread: TEST2, DAC38RF80, AFE7950

Hello,

I am using the AFE9750-TRF1208-EVM in conjunction with the TSW14J56.

I would like to know if it is possible to configure the DACs to generate a constant output value for static test purposes?

This is possible using the DAC38RF80 via the SPIDAC_TEST1 and SPIDAC_TEST2 registers (see page 105 on  https://www.ti.com/lit/gpn/dac38rf80). I have looked over the AFE7950 datasheet and can't find a similar register definition, but perhaps it is disguised as something else? 

Thank you for your help.

Khusro Saleem

  • +1
    TI__Mastermind 18001 points

    Hi Khusro,

    This is possible on the AFE7950. To enable a constant output you have to add the lines in the file below to the end of your Latte script.

    Fullscreen ConstantOutput.txt Download 
    for i in [0,1]:
	for j in [0,1]:
		AFE.JESD.DACJESD[i].dacJesdConstantTestPatternValue(1,j,0,16384,0) # enable, channelNum, bandNum, Ival, Qval

    Regards,

    David Chaparro