Search found 6 matches

The input signal will be 0-.5v with about 100 steps, its a low impedence output from an opamp feeding a very high impedence fet input, we most likely will only be using about 30% of the range with a s ...

Non inverting opamp will use 2 resistors, plus a feedback cap to prevent oscillations at such high gain. Its not the cost its just parts count and greater chance for the high impedence .006v to picku ...

Thats what we may wind up doing, we were trying to keep parts count to a minimum tho. I was hoping we could get away without another IC and 2 resistors.

The 2.2v is the minimum to ensure 1LSB accuracy, not the minimum voltage for the input. I may be off 1 to 2 bits but better than a 2.5v refence voltage which would be equivilent to losing 3 bits.

H ...

The 16f887 has a 0.6v reference on chip that can be used for the comparator or A/D module. It can be set to pin A3. I want to use that as the +Vref. The input has a max of 0.4v so even using a 2.5v re ...

Hi, I'm using a 16F887 and want to use the internal 0.6v Vref for Vref+ and I can't figure out how to have the device use it. The header file for the chip is uncommented for the most part and I am con ...