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Ratiometric_bridge_with_A_D_conversion

2016-05-19 05:27  
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Ratiometric_bridge_with_A_D_conversion
In this circuit, a MAX183 directly converts a bridge output to a 12-bit code using only two precision op amps. No differential-input instrumentation amplifier or reference is needed. The bottom of the bridge is driven by A1 so that the A1 inverting input remains at 0 V. The other bridge output is amplified by A2 in a basic noninverting configuration. No differential amplifier is needed because the bridge output to A2 is referenced to 0 V. The A1 output also drives the MAX183 VREF input so that reference changes (VDD is the reference) in the bridge excitation and the A/D track each other.