The AD7922's precision reference is REF195(the supply voltage is 5v),the REF195's Vs is 12V,is it OK?
Yes, it is okay to use the REF19x references with 12 V Vs. The DS recommends 3.3 V to 15 V and the absolute maximum is up to 18 V ( a point where the device is still operational but not recommended). However, power dissipation should be taken into consideration when too much input voltage is present. Please refer to Device power dissipation section on page 20 of the DS.
I move your question in the amplifiers community as they can explain to you details of your inquiry.
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