Hi, I'm a college student in Seoul, Korea. Thanks for reading my post. I speak english well....so, I hope you understand what I mean and want to know..please......
Nowadays I study about Amplifier AD8555 for Wheatstone bridge with strain gauge. AD8555 is very nice for amplification and DAC.
but, when I program the signal for the operation of AD8555, It's weird that the operation of GAIN between Offset.
In the datasheet of AD8555, THEORY OF OPERATION, equation 1 and 2 show us how to calculate the code for operation we need.
It means that code of GAIN and Offset is independent. But when I change the code of first and second GAIN, the Output of AD8555 is
also changed. I think if we do not change the code of Offset, Voltage offset of output does not change either. But, it's wrong.
So, I wonder that CODES OF GAIN and OFFSET are operating independently?? Did I have a wrong code?
I attach my code for AD8555. I use dsPIC for MCU.
I hope you understand what I mean, and want to get I need.
Sincerely yours. Appreciate for reading my words.