Texas Instruments ADS8910B, Руководство пользователя

Страница: 21 / 39

www.ti.com
ADS8910BEVM-PDK Operation
21 SBAU268 – July 2016
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
ADS8910BEVM-PDK
6.5 Histogram Tool
Noise degrades ADC resolution and the histogram tool can be used to estimate effective resolution , which
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 13 :
Figure 13. Histogram Analysis Tool