I've been up and down the AD2S1205 data sheet and I can't find the equation for velocity. All I got was that its 2's complement, scales with the oscillator, and is 12 bits wide. So, how do I compute RPM, or RPS from that?
It's there, right? Right?
Found it. I found the word RPS in a couple of places and you can compute speed from that number.
speed [RPS] = (Oscillator scale [Hz/Hz]) * (1000 [RPS] / (2048 [counts]) * (ADC Velocity [counts])
There you go.