I'm prototyping a circuit that uses the Maxim MAX7219 LED driver to power some 7-segment displays and a Microchip MCP4901 DAC to output some audio. When I listen to the audio output from the DAC while the MAX7219 is on, there is an unwanted high frequency noise. When I turn the MAX7219 off, the high…

MAX7219/7221 and DAC noise

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