[Solved] Using a DAC (MCP4911) instead of a low-pass filter

Projects General Guidance
4

If your analog data is stored as an int, then the data to be transferred out could be set up as follows:
your_data = your_data | B0111 0000 0000 0000; // sets the needed command bits high, leaves your 10 bit data alone
your_data = your_data & B0111 0011 1111 1111; // clears the needed command bits low, leaves your 10 bit data alone
(spaces shown for clarity only)

digitalWrite ( DAC_SS, LOW ); // connects to device's LDAC pin
SPI.transfer ( highByte( your_data ) );
SPI.transfer ( lowByte( your_data ) );
digitalWrite ( DAC_SS, LOW );