Page 1115 - Basic Electrical Engineering

Texas Instruments SN52 741

The last three digits in each case is 741. Irrespective of who manufactures

an op-amp, the specification for an IC 741 is the same. We shall discuss in
brief IC 741 which is an op-amp, IC555 which is a timer, and IC78XX series

which are voltage regulators.

17.5 OPERATIONAL AMPLIFIERS

An operational amplifier is abbreviated as op-amp. An op-amp is the best-

known linear integrated circuit. Originally op-amps were meant for
performing operations like integration, subtraction, differentiation, etc., and

hence the name was given.
Such operations are useful in analog computers. However, op-amps can

also be used in signal amplification, filters, oscillators, voltage regulators,
analog to digital (A to D) and digital to analog (D to A) converters, etc.
Manufacturers provide a number of informations of the IC they supply

including their pin diagrams. The informations provided include intended
applications, maximum ratings, electrical characteristics, performance

limitations, equivalent circuit, etc. Maximum ratings may include supply
voltage, internal power dissipation, temperature range, etc. The pin diagrams
of an IC 741 in eight-pin metal can package and eight-pin mini dip package

are shown in Fig. 17.3.
An op-amp is a high-gain directly coupled linear differential amplifier. The

performance of an op-amp is controlled by negative feedback from the output
to the input. It is called a differential amplifier since it amplifies the

difference between the two input signals. An op-amp amplifies both ac and
dc input signals.