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AD5272 - Question

Question asked by TigerClaw on Sep 21, 2016
Latest reply on Sep 28, 2016 by msamera

Hello,

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?

Thanks.

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