SBAU269C October 2016 – August 2021 ADS8900B
Noise degrades ADC resolution, but the histogram tool (shown in Figure 6-8) can be used to estimate the effective resolution. This resolution is an indicator of the number of bits of ADC resolution losses resulting from noise generated by the various sources connected to the ADC when measuring a DC signal. The cumulative effect of noise coupling to the ADC output from sources such as the input drive circuits, the reference drive circuit, the ADC power supply, and the ADC itself is reflected in the standard deviation of the ADC output code histogram that is obtained by performing multiple conversions of a dc input applied to a given channel.
The histogram corresponding to a dc input is displayed on clicking on the Capture button, as shown in Figure 6-8.