I set the register as shown below.
But The(The AD7747) collections of data is less than 0X800000, and I learn the formula for digital signals into analog signals is
(CODE - 0X800000)*8.192/0X800000
As shown in the above,if the collections of data is 0x7852A1, the analog sinnal is Less than zero,which is is a negative number.
Looking forward to hearing you