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Home > 1.ANALOG, ADC > Sensor to ADC—analog interface design

Sensor to ADC—analog interface design

Introduction

The sensor output voltage span seldom equals the analog- to-digital converter (ADC) input voltage span. Sensor data is lost and/or ADC dynamic range is not fully utilized because the spans are unequal, start at different DC voltages, or both. In Figure 1(a) the spans are equal but offset. This situation requires level shifting to move the sensor output voltage up by one volt so the spans match. In Figure 1(b) the spans are unequal, but no offset exists. This situation requires amplification of the sensor output to match the spans. When the spans are unequal and off- set, as is often the case, level shifting and amplification are required to match the spans.

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Categories: 1.ANALOG, ADC
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