OK, maybe I'll just ditch that idea and go with VREF = VCC/2. Did you see my edit to post #37?
Also, I was mistaken about having a bunch of MCP6002s. I have MCP619s. I think they should work just as well for my purposes though. Thoughts?
hi,
The MC619 has better input offset and noise figure than the MCP6002, so it should perform well in the circuit.
IIUC you have some 1K 1% resistors, I would use those instead of the NTE952. The Vref using may not be precisely 2.500V, see image.
The 1K divider Vref should track the Vext to the bridge, the MCP3204 is a ratio metric adc.
The NTE adjust pin, is used to add resistors in order to improve the temperature tracking.
NOTE: on some 2.5Vref devices ie: TL431 for example, the Vref can be changed by adding resistors from +Vs and 0V to the adjust pin.
The d/s for the NTE952 is not clear regarding the Vref change on using adjust.
Attachments
Last edited: