LM363 datasheet(8/22 Pages) NSC

부품명	LM363

상세설명	LM363 Precision Instrumentation Amplifier

PDF	22 Pages

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제조업체	NSC [National Semiconductor (TI)]

홈페이지	http://www.national.com

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8 / 22 page

Simplified Schematic (pin numbers in parentheses are for 8-pin package)

TLH5609 – 7

Theory of Operation

Referring to the Simplified Schematic it can be seen that

the input voltage is applied across the bases of Q1 and Q2

and appears between their emitters If RE1-2 is the resist-

ance across these emitters a differential current equal to

VIN RE1-2 flows from Q1’s emitter to Q2’s The second

stage amplifier shown maintains Q1 and Q2 at equal collec-

tor currents by negative feedback to Q4 The emitter cur-

rents of Q3 and Q4 must therefore be unbalanced by an

amount equal to the current flow across RE1-2 Defining

RE3-4eR5aR6 the differential voltage across the emitters

of Q4 to Q3 is equal to

VIN

RE 1-2

RE3-4

This voltage divided by the attenuation factor

R3aR4

R1aR2

is equal to the output-to-reference voltage Hence the over-

all gain is given by

VOUT

VIN

R3aR4

RE3-4

RE1-2

LM363 데이터시트(PDF) 8 Page - National Semiconductor (TI)