AD9218, what will the negative values be in binary mode?

I assume you mean -10mV AC coupled into the AD9218 (it is internally biased at 1/3Vdd)

You would have 1/200 of the negative dynamic range, or 1/100 of the span range which gives -10/1024.

As the output is set for 2s complement, the output will run from +511 to -512 (Hex = 0x1FF at +511 to 0x200 at -512) for an input of 1Vp-p, so in this case, you should get 3F6, rounded to the nearest integer. (-10 decimal)

Cheers

PeteS

further to my other reply, if you are using offset binary, then you will get N[off] - 10 (decimal). The output of the DAC at Vin(centre) should be 0x200, so you would get 1F6.

Cheers

PeteS

On 28 Nov 2005, Frank put down his happy meal and blurted:

I'm lovin' it.

Thank you Peter.

My digital output is from 0-1024 (1MHz sine wave 0 -> -1, 1024 -> +1) and fed into the