Convert 1kHz PWM signal to 0-10V DC with minimal ripple
There are multiple ways to skin this cat.  I've used a double pole low pass filter set around 600Hz with the PWM set to 10kHz.  We achieve 0-10V with 10mV steps with that set up.

Or you can get a DAC chip that will do it as well.  The DAC chip will have fewer parts and better accuracy with simple parts, but will cost a little more $.

The filter method will require a few 0.1% resistors to make sure that you don't have offsets from board to board.