Cirrus Logic CS4334 DAC Low Pass Filter?
Since this is a single supply DAC, the output has a DC bias.
First there is 267k of DC load resistance.
Then there is a 3.3uF DC bias blocking capacitor to remove DC bias.
Then there is a 10k resistor to ground to keep DC bias at 0V, regardless of if there is a load connected or not.
Then you have the traditional RC lowpass filter.
Finally the load at the input of next device is modeled as resistor to ground.