I am using a BIpolar ADC from Linear technology (LTC1859) to detect +/-10V. The input of the ADC is connected to LT1885 which has been configured as a sallen key filter with 1kHz cut off frequency.
The ADC is experiencing some problems in detecting 0V. Around Zero volts, the ADC starts spitting out random values to the microcontroller. This happens for +/-30mV around zero. For all other voltages, the ADC works fine. What could be causing this weirdness in the ADC. All answers are appreciated. Also around +10V and -10V, the ADC saturates at about 9.998V.
Thanks,
abqguy
The ADC is experiencing some problems in detecting 0V. Around Zero volts, the ADC starts spitting out random values to the microcontroller. This happens for +/-30mV around zero. For all other voltages, the ADC works fine. What could be causing this weirdness in the ADC. All answers are appreciated. Also around +10V and -10V, the ADC saturates at about 9.998V.
Thanks,
abqguy
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