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AD7747 can‘t receive  a right data(such as 0X7B1247 )

Question asked by on Mar 16, 2015
Latest reply on Mar 20, 2015 by EricC

I  set the register of CAPDAC, it's 0xA0(0pF).  In general,I convert the digital to Analog by "(code-0x800000)/(0xFFFFFF-0x800000)*8.192".

  Always,I get some  right digitals ,such as 0x822541/0x801154/0x852415(these digitals >0x800000).But recently most of DATA is less-than 0x800000.