[time-nuts] V standards

[WarrenS]

Dick

Here is one way to add 2 LS  bits (or more) to any Dac no matter how it is made.
This assumes that the Dac that you are adding these bits to is 0 to 5 volts Fullscale 
and accurate enough to justify adding LS bits.

To add 2 LS bits to a 14 bit Dac.
An easy ways to do it is NOT to use PWM.
That way it needs no filtering and no PWM 
and few software resources, maybe none. 
The added 15th Bit wants to add  1 / 32,768 of 5 volts 
The added bit #16 wants to add 1 / 65,536 of 5 volts 

As a universal solution, Add a small resistor at the output of the 14 bit Dac 
of Value R (say 10  to 100 ohms).