DAC accuracy

I've run an experiment on an active filter. I am using the NI Elvis prototyping board. The frequency response is taken with the NI Bode analyzer and I saved the output data in a text file. The Bode analyzer amplitude spec is give as 12 or 16 bits, how do I calculate the amplitude error using the 12 bit accuracy spec? The measurements are in dB.

The theoretical S/N ratio of a perfect converter with a random input and Q bits of resolution is approx. 6.0206Q dB. Thus for 12 bits, the S/N ratio is 72.2dB (the quantizing noise is -72.2dB below full scale),

This thread would have been way cooler if it had been called DACcuracy.

That's all I had to add. crutschow gave away the answer