I am using LTC2497. I wanted to clarify the following,
My Vs = 5v and I am planning to use a precision 2.5V as the Vref for differential ADC. I wanted to check if this is the correct value, the last sentence states, the Vref will set the full scale range for all input channel. My concern is that upon using the 2.5Vref, I can only read +/- 1.25V.
With IN- biased at 1.25V the input range for IN+ would be 0V - 2.5V.
I have attached my schematics as well. Appreciate if you could point out my error.
I managed to get the voltage reading for anything below 2.5v. Anything above 2.5v gives me "11" and the reading is out of range. Any possible thing i could have missed?
1. We are driving a E-Load. Battery voltage 3.3V.
2. Vss = REF+ = 5V from USB
3. REF- = 5V from USB / 2
4. Applied input voltage = 5v
5. Output code by ADC: 1111111100000111000000
I measured the REF+ and REF- its at 4.799v and 0v.
Look at the -input. From your description, it is probably tied to ground instead of REF/2.
Hi..I tired the -input to Ref/2 on the PCB. I used the original linduino code and it works perfectly. Could it be any other issue during my decoding process?
I am not a programmer. I can only suggest that you compare the Linduino code to your code and see what differences there are.