I am using a voltage divider with 10V input. Because I want to get 5V Uout, I select 20k for R1 and R2 is my AD5272 with 20k.
Now i have 2 questions:
1. On Page 23 (Datasheet) there is a formula: Rwa(D)=D/1024*Rwa
Because I have Bit 0-1023 that means 1023/1024*20k= 19980Ohm. That means I will never reach 20k, isn't it?
2. If I set the Register for example to 1023 I get 5V out. But if I set it to 0, I don' get 0V out. I get 0,04V but why? Ok, this voltage divider is non-linear but if i set D=0 normally I have to get 0V out. What is the reason?