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In Your data sheet for the AD7856ARS page 7. Pin 7 CREF1, it says 470n NP0. Is this correct? We cant find such high value with NP0.
The recommendation that the 470nF capacitor be an NPO type is not really required in practice. We have achieved specified performance without an NPO capacitor in place. The reason for the dual decoupling capacitors is to effectively decouple the high frequency bursts of charge which arise in the DAC. So the absolute value of the capacitor is not so important. Any 470nF ceramic capacitor with low ESR, ESL is suitable. The designation of a capacitor as NPO means that it's value does not have a significant positive or negative temperature coefficient. We originally thought that the high equivalent series resistance of high value ceramic capacitors could cause a problem but this turned out not to be the case.