Contents
What affects the accuracy of the ADC process?
Many factors including voltage reference, PCB layout, I/O switching, and analog source impedance and so on can affect the ADC accuracy depending on the application. An analog-to-digital converter, or ADC, is a device or peripheral that converts analog signals into digital signals.
How is ADC INL calculated?
INL = | [(VD – VZERO)/VLSB-IDEAL] – D | , where 0 < D < 2N-1. VD is the analog value represented by the digital output code D, N is the ADC’s resolution, VZERO is the minimum analog input corresponding to an all-zero output code, and VLSB-IDEAL is the ideal spacing for two adjacent output codes.
What is the difference between ADC accuracy and resolution?
ADC Dynamic Range, Accuracy and Resolution Dynamic Range is defined as ratio between the smallest and the largest signals that can be measured by the system.
How to increase the analog to digital converter accuracy?
To have the maximum ADC conversion precision, it is preferable that the ADC dynamic range matches the maximum amplitude of the signal. Assume that the signal to be converted varies between 0 V to 2.5 V and that VAREF is equal to 3.3 V. The maximum signal value converted by the ADC is 3102 (2.5 V) as shown in Figure 9.
Is the ADC still accurate after LSB conversion?
A common experience is to see a solid conversion of several bits wide with an unpredictable, nonsensical behavior from the last, or least significant bits (LSB). The ADC still has a resolution as advertised, but accuracy suffers with the LSBs.
How to determine the repeatability of an ADC?
Look at AC specifications to help with determining repeatability (not accuracy), including the effective resolution (ER), signal-to-noise ratio (SNR), signal-to-noise plus distortion (SINAD), effective number of bits (ENOB), or noise-free resolution tell us about the ADC’s claims to repeatability in a datasheet.