Datasheet > AN-733

AN-733

更新时间： 2024-11-29 12:24:27

品牌	Logo	应用领域
亚德诺 - ADI		运算放大器
页数	文件大小	规格书
4页	631K
描述
Universal Precision Op Amp Evaluation Board in MSOP Package

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AN-733 数据手册

AN-733

APPLICA

TION NOTE

One Technology Way •

O. Box 9106 • Norwood, MA 02062-9106 • Tel: 781/329-4700 • Fax: 781/326-8703 •

www.analog.com

Universal Precision Op Amp Evaluation Board in MSOP Package

by Giampaolo Marino, Souﬁane Bendaoud, and Steve Ranta

INTRODUCTION

LOW-PASS FILTER

The EVAL-PRAOPAMP-1RM is an evaluation board which

accommodates single op amps in MSOP packages. It is

meant to provide the user with multiple choices and

extensive ﬂexibility for different application circuits

and conﬁgurations. This board is not intended to be

used with high frequency components or high speed

ampliﬁers. However, it provides the user with many

combinations for various circuit types, including active

ﬁlters, differential ampliﬁers, and external frequency

compensation circuits. A few examples of application

circuits are given in this application note.

Figure 1 is a typical representation of a ﬁrst-order low-

pass ﬁlter. This circuit has a 6 dB per octave roll-off

after a close-loop –3 dB point deﬁned by f_C

. Gain below

this frequency is deﬁned as the magnitude of R7 to R2.

The circuit might be considered as an ac integrator for

frequencies well above f_C; however, the time domain

response is that of a single RC, rather than an integral.

f_C= 1/(2  R7  C7); –3 dB frequency

f_L= 1/(2  R2  C7); unity gain frequency

Acl = –(R7/R2); close loop gain

R6 should be chosen equal to the parallel combination

between R7 and R2 in order to minimize errors due to

bias currents.

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Figure 2. Difference Ampliﬁer

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DIFFERENCE AMPLIFIER AND PERFORMANCE

OPTIMIZATION

Figure 2 shows an op amp conﬁgured as a difference

ampliﬁer. The difference ampliﬁer is the complement

of the summing ampliﬁer, and allows the subtraction

of two voltages or the cancellation of a signal common

to both inputs. The circuit shown in Figure 2 is useful

as a computational ampliﬁer in making a differential

to single-ended conversion or in rejecting a common-

mode signal. The output voltage V_OUTis comprised of

two separate components:

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1. A component V_OUT1 due to V_IN1 acting alone (V_IN2

short circuited to ground.)

Figure 1. Simple Low-Pass Filter

2. A component V_OUT2 due to V_IN2 acting alone (V_IN1

short circuited to ground.)

REV. A

12 3 4

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