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Module 6.5
Op amp = Packages
=20 =20- After studying this section, you = should be able=20 to:
- Recognise typical op amp packages.
- =E2=80=A2 4 pin & 8 pin DIL
- =E2=80=A2 Metal can.
- =E2=80=A2 Pentawatt
- =E2=80=A2 Power amplifier packages.
- Recognise typical pin functions on op amps.
- =E2=80=A2 Offset null.
- =E2=80=A2 Power inputs.
- =E2=80=A2 Programmable = inputs.
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Fig 6.5.1 Typical Op amp packages
Op Amp Choices
Op amps, like any amplifier circuit, can be built from discrete = components,=20 i.e. resistors, capacitors and transistors, or even using valves = (tubes).=20 However, op amp integrated circuits are available in many different = types and=20 packages, which considerably reduce the component count in discrete = circuits.=20 Some examples of IC op-amps are shown in Fig. 6.5.1. Manufacturers offer = ranges=20 of both BJT and CMOS amplifiers, as well as comparators, that can be=20 incorporated into many electronics systems using a minimum of external=20 components, the greater the degree of integration the more design = complexity and=20 cost is reduced. Many op-amp ICs are also avaliable in surface mount = format,=20 giving great reductions in circuit size and also allowing for automated = assembly. Further integration has produced Application Specific = Integrated=20 Circuits (ASICS) where op amp technology has been combined with other = circuit=20 elements within a single IC designed to carry out a specific circuit = function=20 within a particular dedicated application such as a TV receiver or a = cell=20 phone.
IC Pinout Examples
1. TLC271 Programmable Op Amp
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The TLC271=20 from Texas Instruments is a = programmable op amp=20 in an 8pin DIL (Dual In Line) package, (other package types available) = which=20 offers a range of programmable power consumption modes, selected by the = level of=20 voltage applied to the bias select pin.
2. LMC660CN Quad CMOS Operational Amplifier
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National Semiconductor LMC660CN quad CMOS operational amplifier = offers 4 op=20 amps in a single package that uses a single voltage power supply of = between 5V=20 and 15V. See the LMC660=20 datasheet from Texas Instruments for = additional=20 features.
3. 741 General Purpose Op = Amp
The
4. LM3875 56Watt Power Amplifier
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The
5. TDA2003A 10Watt Car Audio Power Amplifier
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The TDA2003A=20 from ST Microelectronics is a high = performance =20 audio amplifier designed for car radios. This 10watt amplifier will = deliver an=20 output current of 3.5A and uses a power supply of up to 18V DC. The 5 = pin=20 Pentawatt package offers savings in space and cost, requiring only a few = external components.
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