Hello,
I'm building an circuit to generate an analog output with range 0 .. 15mV however i have getting a noise on my output when i measure (with instrument to read load cells, with range 0..50mV and 15bit). I can calibrate the output, and works fine, but sometimes the noise is too much.
On oscilloscope, I cant measure "ripples or noises" because its very small.
Follow the schematic:
My 3.3V is used as reference in my DAC (and i use an voltage reference to generate it). I would like to supply the OP07 with +-5V, however my charge pump only generate -1.4V on negative supply, but, i think this doenst it the problem.
I attempted to put an low pass filter on AO+ and AO- with 159Hz and 0,15Hz, but the problem persist.
Ps: my resistors does not precision and stable (are standards, with tol of 5%)
Someone has a suggest?
thnx