EVAL-PRAOPAMP-1KSZ【PDF 1/4 页】ADAPTOR BOARD SINGLE AMP SC70-5

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AN-734

APPLICATION NOTE

ONE TECHNOLOGY WAY ? P.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 SC70 PACKAGE

BY GIAMPAOLO MARINO, SOUfi ANE BENDAOUD, AND STEVE RANTA

INTRODUCTION

THE EVAL-PRAOPAMP-1KS IS AN EVALUATION BOARD WHICH

ACCOMMODATES SINGLE OP AMPS IN SC70 PACKAGES. IT IS

MEANT TO PROVIDE THE USER WITH MULTIPLE CHOICES AND

EXTENSIVE fl EXIBILITY FOR DIFFERENT APPLICATIONS CIRCUITS

AND CONfi GURATIONS. THIS BOARD IS NOT INTENDED TO BE

USED WITH HIGH FREQUENCY COMPONENTS OR HIGH SPEED

AMPLIfi ERS. HOWEVER, IT PROVIDES THE USER WITH MANY

COMBINATIONS FOR VARIOUS CIRCUIT TYPES INCLUDING ACTIVE

fi LTERS, DIFFERENTIAL AMPLIfi ERS, AND EXTERNAL FREQUENCY

COMPENSATION CIRCUITS. A FEW EXAMPLES OF APPLICATION

CIRCUITS ARE GIVEN IN THIS APPLICATION NOTE.

LOW-PASS FILTER

FIGURE 1 IS A TYPICAL REPRESENTATION OF A fi RST-ORDER LOW-

PASS fi LTER. THIS CIRCUIT HAS A 6 DB PER OCTAVE ROLL-OFF

AFTER A CLOSE-LOOP –3 DB POINT DEfi NED BY F C . GAIN BELOW

THIS FREQUENCY IS DEfi NED 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 AMPLIfi ER

DIFFERENCE AMPLIFIER AND PERFORMANCE

OPTIMIZATION

FIGURE 2 SHOWS AN OP AMP CONfi GURED AS A DIFFERENCE

AMPLIfi ER. THE DIFFERENCE AMPLIfi ER IS THE COMPLEMENT

OF THE SUMMING AMPLIfi ER, 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

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AS A COMPUTATIONAL AMPLIfi ER IN MAKING A DIFFERENTIAL

TO SINGLE-ENDED CONVERSION OR IN REJECTING A COMMON-

MODE SIGNAL. THE OUTPUT VOLTAGE V OUT IS COMPRISED OF

TWO SEPARATE COMPONENTS:

FIGURE 1. SIMPLE LOW-PASS FILTER

1. A COMPONENT V OUT 1 DUE TO V IN 1 ACTING ALONE (V IN 2

SHORT CIRCUITED TO GROUND.)

2. A COMPONENT V OUT 2 DUE TO V IN 2 ACTING ALONE (V IN 1

SHORT CIRCUITED TO GROUND.)

REV. A

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