I'm DFAE. I have received a question about AD7730 from my customer. According to the customer, temperature drift of AD conversion data using external clock is lager than X'tak and internal clock oscillator. Input signal is DC signal for this test. Bridge was connected same as Figure.24 in AD7730 datasheet. When the temperature was changed from 0 degree C to 40 degree C, output data of ADC was changed about lower 6 bit in 24bit.
Is there an influence of clock type (external or X'tal + internal oscillator) for ADC data when input signal is DC?