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Help: Choose a Capacitive-to Digital Converter

Question asked by on Sep 15, 2015
Latest reply on Sep 22, 2015 by

Hi all,

    I am looking for a Capacitive to Digital converter of which the sampling frequency is bigger than 1KHz and the Conversion frequency is bigger than the sampling frequency and the resolution should be in fF level.Does someone have a good advice? I've checked some products such as AD7746 of which the UPDATE Frequency is 10Hz to 90Hz , AD7152/53 of which the conversion time is 5ms .I do not understand why the conversion time is so big and  I think conversion frequency should be bigger than sampling frequency .If I am wrong ,please let me know .I am a beginner. Thanks.