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The collections of data (AD7747)

Question asked by 阿达7747 on Mar 18, 2015
Latest reply on Mar 18, 2015 by sitti

  Hello!everyone,

I set the register as shown below.

  CDCwrite(AD7747_Adr,0X0A,0X21);

  CDCwrite(AD7747_Adr,0X0B,0X00);

  CDCwrite(AD7747_Adr,0X09,0X0E);

  CDCwrite(AD7747_Adr,0X07,0XA0);

 

 

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

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