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DAC8832EVM: DXP issues with DAC8832EVM

Part Number: DAC8832EVM

Hello,

I am trying to use the DAC8832 EVM but after setting up the DXP software and trying to generate a waveform with all the defaults in place, I don't really see the output that I was expecting. I was trying to generate a square wave with a frequency of 35Hz.

Here is how I have my DXP set up while trying to generate my square wave. As I stated before I have all the default configurations for the EVM in place and I am reading the generated signal from the designated pin (J1-2).

I also had issues with downloading the .XML file for my EVM and I used the file provided by a previous E2E post. So this may be an issue?

I tried changing some of the options available to me, such as the source, offset voltage, and frequency but it still did not look much better.

Thanks,

-Oscar

  • Oscar,

    My first question would be whether the DC writes appear to respond as expected on the EVM to see if there is an issue specifically associated with the square wave versus the more simplistic write operations. From your scope capture it looks something like 100mVpp centered near 460mV is the output you are currently seeing? Where on the EVM is this probed?

    The EVM output amplifier is powered by "+5VA" and "-V" nets on the design. You will want to make sure these supplies are present. "-V" looks to be connected to "-5VA" which is pin 4 on the J3 header and not provided by default from the MMB0. Unless there is an external supply connected here (or GND) the U1 negative rail is floating.

    I would also suggest measuring the reference at TP1 to ensure there is a stable and expected reference voltage.