Thank you Kevin.
It was removed the OPAM from DAC8871 EVM and the Slew rate was 320ns. Thanks a lot for your support.
Two more questions about the slew rate. DXP was programmed to generated a square wave at 200KHz. The signal in the oscilloscope is shown in the attached file. The signal get distortioned by the slew rate, in positive and negative voltages.
I guess that lowering the Vref voltage to 5V, the output voltage will be better, but it was get the same result.
The questions are:
* Do I missing something in order to get a clean square wave?
* If the DAC slew rate can not be reduced, then can you suggest other DAC, in order to get a square wave at 400KHz.
Regards.