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3 Op-Amp Differential Instrumentation AmpThis is the best Instrumentation OpAmp, Great CMRR,
ensure supply has no ripple and keep analog and digital grounds
separate. Ri can be replaced with a trimpot and resistor to alter gain.
Connect a preset ends to pins 1 and 8 and preset wiper to VCC for
Offset Null when high gains are configured. The Input zeners and diodes form a protective clamp for all voltages above VCC-VDD. If supply is changed to +12 -12 change zeners to 12V zeners. Use similar Zeners at output to protect Output from being zapped by overvoltages or high energy - voltage*frequency transients. Add plastic capacitors across Rf for damping AC operation or ripple. Also avoid floating inputs by providing a bias. Vout = (Vp - Vn) * (2Rf+Ri)/RiRelated Reading |
