Differential NBO2 Sensor Input - Block N


        This circuit is designed to process the input signal from up to two NBO2 Lambda sensors.  The LM9040 is a Dual Lambda Sensor Interface Amplifier that can process a remotely referenced O2 sensor.  The remote ground connections present a common mode input to the processor which then samples the potentially noisy input signal recovering the true NBO2 sensor's output voltage.

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02/28/05 - A wiring error was detected.  The corrected schematic segment is below.  R401 and R402 should have been attached to the non-inverting inputs of U400.