ADC测量和评估基础知识（等效位宽、线性度等）.pdf_adc的线性度 - CSDN文库

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000

AnalogInputVoltage

001

010

011

100

101

110

111

Digital

Output

Code

FS1/2FS 3/4FS1/4FS0

Transitionpoint =where

outputcodechanges

fromonecode

toanadjacentcode

Idealtransferfunction

fora3-bitA/D

Transition

Points

codewidth

Idealcodewidth =

1LSB

www.ti.com

Appendix A Basics of ADC Measurement and Evaluation

The information presented in this section is relevant for all ADC evaluation and performance

characterization. For further information, please refer to the IEEE Standard 1241-2000.

NOTE: For additional examples and explanations of these measured parameters, users are

encouraged to download and review a copy of Texas Instruments' application report

SBAA147, A Glossary of Analog-to-Digital Specifications and Performance Characteristics.

A.1 Definitions of Measured Parameters

One primary task in evaluating an ADC is determining its transfer function. Ideally, a converter would have

a transfer function similar to that shown in Figure 33. This graph shows a transfer function for a 3-bit

converter. Ideally, the width of each code is exactly the same, and a straight line can be drawn through

the midpoints of each code plateau. In practice, this performance is not always observed; determining the

transition points and code widths is critical to ADC testing and characterization, because it lets us see

where the actual transfer function deviates from the ideal.

Figure 33. ADC Transfer Function

33

SBAU128C–August 2007–Revised March 2012 Basics of ADC Measurement and Evaluation

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Copyright © 2007–2012, Texas Instruments Incorporated

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