How to filter noise on the DAC?

Question

Electronics

Introductory: there is an STM32 with two DAC channels, which at the output give me an adjustable voltage in the range of 0-75 mV.
The voltage is small, the wires have a non-zero length and will certainly be subject to interference.
So, you need to filter out everything above 20 Hz I think.
How to do it?
How to generally protect and filter the DAC?

Answer 1

1. What is the length of the line before loading the DAC?
2. What kind of load does the DAC have? Inductive, capacitive or resistive?
If the DAC load is linear and resistive, I would advise you to run a DAC with an output voltage up to the supply voltage before the load, and put a resistive divider directly next to the load that produces the desired voltage.
If the voltage at the load changes slowly (that is, you do not generate a sine or other periodic function with a frequency of several hertz with the DAC), you can hang a capacitor on the line. Take the capacitance depending on the rate of change of the DAC signal.
If the line from the DAC to the load is routed on the printed circuit board, it makes sense to surround it with a polygon connected to GND, mount the overhead communication line with a wire in the screen, connect the screen either to the product case or to GND, this already depends on the circuitry of your device.