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1.
Amplifier Basics

2.
Class A Amplifier Design

3.
Multistage Amps & NFB

4.
Amplifier Circuits

5.
Power Amplifiers

6. Operational Amplifiers

6.0
Introduction

6.1
Op amp Inputs

6.2
Comparators

6.3
Voltage Amplifiers

6.4
Op amp Characteristics

6.5 Op amp Packages

6.6
Op amp Circuits

6.7
Op amps Quiz

Module 6.5

Op amp Packages

What you´ll learn in Module 6.5

After studying this section, you should be able
to:

Recognise typical op amp packages.

• 4 pin & 8 pin DIL

• Metal can.

• Pentawatt

• Power amplifier packages.

Recognise typical pin functions on op amps.

• Offset null.

• Power inputs.

• Programmable inputs.

Fig 6.5.1 Typical Op amp packages

Op Amp Choices

Op amps, like any amplifier circuit, can be built from discrete components,
i.e. resistors, capacitors and transistors, or even using valves (tubes).
However, op amp integrated circuits are available in many different types and
packages, which considerably reduce the component count in discrete circuits.
Some examples of IC op-amps are shown in Fig. 6.5.1. Manufacturers offer ranges
of both BJT and CMOS amplifiers, as well as comparators, that can be
incorporated into many electronics systems using a minimum of external
components, the greater the degree of integration the more design complexity and
cost is reduced. Many op-amp ICs are also avaliable in surface mount format,
giving great reductions in circuit size and also allowing for automated
assembly. Further integration has produced Application Specific Integrated
Circuits (ASICS) where op amp technology has been combined with other circuit
elements within a single IC designed to carry out a specific circuit function
within a particular dedicated application such as a TV receiver or a cell
phone.

IC Pinout Examples

1. TLC271 Programmable Op Amp

The TLC271
from Texas Instruments is a programmable op amp
in an 8pin DIL (Dual In Line) package, (other package types available) which
offers a range of programmable power consumption modes, selected by the level of
voltage applied to the bias select pin.

2. LMC660CN Quad CMOS Operational Amplifier

National Semiconductor LMC660CN quad CMOS operational amplifier offers 4 op
amps in a single package that uses a single voltage power supply of between 5V
and 15V. See the LMC660
datasheet from Texas Instruments for additional
features.

3. 741 General Purpose Op Amp

The 741 op amp
has been a very popular design since its introduction by Signetics (now part of
Philips NXP Semiconductors) in the 1960s.
Today, it is available from a number of manufacturers (including Texas
Instruments) in several different versions and in a variety of package
designs including the 8 pin DIL package. The illustration shows it in an eight
lead TO5-8 package, and although the 741 has been superseded in many respects by
more modern designs, it remains a good general purpose op amp.

4. LM3875 56Watt Power Amplifier

The LM3875
from National Semiconductor is a
high-performance audio power amplifier in a single integrated circuit, capable
of delivering 56W of continuous average power to an 8O load with 0.1% total
harmonic distortion and noise within the 20Hz to 20kHz audio range. All this in
a TA11B 11 pin package less than 1 inch square.

5. TDA2003A 10Watt Car Audio Power Amplifier

The TDA2003A
from ST Microelectronics is a high performance
audio amplifier designed for car radios. This 10watt amplifier will deliver an
output current of 3.5A and uses a power supply of up to 18V DC. The 5 pin
Pentawatt package offers savings in space and cost, requiring only a few
external components.

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