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DAC8820EVM digital noise

SSquared
Intellectual 260 points
Other Parts Discussed in Thread: DAC8820

I have a post in the microcontroller forum. But also wanted to post this in the precision data forum too.

I am working on an application with the F288335 experimenter Kit using the ADC to read in a value and then output a processed value to a DAC8820. The connection to the DAC8820 is a parallel connection. The sampling rate of the ADC is 1MHz. The output rate is at about 100kHz.

There is excessive digital noise on the ground when the process is running. It is creating about +/-20mV on the ground. At every analog voltage source there are bypass capacitors of 10uF (electrolytic) and 0.1 uF (tantalum) to help reduce the noise.

Any suggestions on being able to reduce the noise?

  • 0
    TI__Mastermind 46290 points

    SSquared,

    There are a few possibilities that immediately come to mind;

    • Sounds like you're blue-wiring EVMs together, this isn't an ideal configuration for the GND plane and having these stray parasitics from whatever interconnects you're using is a contributor
    • If you can lower the digital logic level used to communicate between the devices this will help
    • If you can control the slew rate of the digital logic, slowing down the slew rate will help reduce digital feedthrough