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Strange things with AD9281

I am using the ad9281 as the basis for a USB oscilloscope.

The first problem is noise if I go above 10MHz clocking.

If I reduce the clock speed the noise goes down.

The other problem is with 1 volt in I am getting code 166 out when it should be 128.

Vref is 2 volts.

I am using a PIC micro to clock the a2d then I just read data in to PIC port b so its pretty basic really.

Any advice would be appreciated.