Transcription of Differential ADC Biasing Techniques, Tips and Tricks
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Differential ADC Biasing Techniques, Tips and Tricks
2002 Microchip Technology 1 MAN842 INTRODUCTIONTrue Differential converters can offer many advantagesover single-ended input A/D Converters (ADC). In addi-tion to their common mode rejection ability, these con-verters can also be used to overcome many DC biasinglimitations of common signal conditioning below are some typical application issues thatcan be solved with proper Biasing of a Differential con-verter: Limited output swing of amplifiers Unwanted DC-bias point Low level noise riding on ground Unwanted or changing common mode level of input signalThis application note discusses Differential input config-urations and their operation, circuits to implementthese input modes and techniques in choosing the cor-rect voltage levels to overcome the previouslymentioned AND SINGLE-ENDED INPUT CONFIGURATIONSB efore discussing Biasing solutions, it is important tounderstand the functionality of Differential A/D convert-ers.
AN842 DS00842A-page 4 2002 Microchip Technology Inc. A smaller VREF allows for wider flexibility in a common mode voltage. It should be noted however that by decreasing the VREF, linearity performance is sacri- ficed. Characterization graphs for Microchip’s true dif-
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