Vref select for ADC

151

01:42:00

Voltage reference: 1.024V, 2.048 or 4.098.
Use a ref diode and a current source for a stable 2.5V reference, eg with a TL431 and a JFET. Then trim it down to 1.024 using your most accurate DMM. Set the gain of the op-amp to x1, x2 or x4 with the switches.

published 11 years ago

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