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如何为数据转换器选择运放
Application Report
SLOA035C – November 2010
Amplifiers and Bits: An Introduction to Selecting
Amplifiers for Data Converters
Bruce Carter, Patrick Rowland High Performance Linear Products
Jim Karki, Perry Miller
ABSTRACT
This application report discusses various considerations that must be taken into account
when interfacing general-purpose amplifiers and analog-to-digital converters. The report
discusses bandwidth, resolution, analog ADC input drive, and power supply
considerations for both parts.
Contents
1 Introduction 2
2 The Importance of Buffering 3
3 Bandwidth4
3.1 Feedback Theory 4
3.2 Closed Loop Bandwidth 5
3.2.1 Noninverting Closed Loop Bandwidth 6
3.2.2 Inverting Closed Loop Bandwidth7
3.3 Gain Bandwidth Safety Margin8
3.4 Gain Bandwidth Dependence on Supply Voltage 9
4 Slew Rate 10
5 Noise and Bits 10
5.1 Noise From the Graph11
5.2 Noise From the nV or μV / Hz Specification11
5.3 Total Harmonic Distortion Plus Noise12
5.4 Signal to Noise Ratio13
5.5 SINAD 14
5.6 Effective Number of Bits (ENOB) 15
5.7 ADC Bits16
5.8 ADC Input17
5.9 Drive Current19
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