Chapter 373

Auto-zeroing A/D offset voltage

Guy Hoover and William Rempfer


The LTC1090 data acquisition system, which allows a user to digitize signals from low voltage transducers without the need for a gain stage, is described


Data acquisition



Many A/D converters exhibit low offset errors with large full-scale voltages. However, when the full-scale voltage is decreased the VOS, expressed in LSBs, increases. An A/D converter with 0.5 LSB of offset with a 5V full-scale voltage can have 12.5 LSBs of offset with a 200mV full-scale voltage. With the LTC1090 family of data acquisition systems and a few external components it is now possible to reduce the VOS to only 0.25 LSB even with only a 200mV ...

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