National Semiconductor Instrumentation Amplifiers 2

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Part RoHS Manufacturer Amplifier Type Temperature Grade Terminal Form No. of Terminals Package Code Package Shape Total Dose (V) Package Body Material Nominal Unity Gain Bandwidth Maximum Negative Supply Voltage Limit Maximum Input Offset Voltage Maximum Average Bias Current (IIB) Surface Mount No. of Functions Minimum Common Mode Reject Ratio Technology Screening Level Nominal Common Mode Reject Ratio Maximum Supply Current Nominal Negative Supply Voltage (Vsup) Architecture Programmable Power Packing Method Nominal Supply Voltage / Vsup (V) Power Supplies (V) Package Style (Meter) Package Equivalence Code Maximum Input Offset Current (IIO) Minimum Slew Rate Sub-Category Nominal Slow Rate Maximum Non Linearity Maximum Supply Voltage Limit Terminal Pitch Maximum Operating Temperature Maximum Bias Current (IIB) @25C Maximum Common Mode Voltage Frequency Compensation Minimum Voltage Gain Minimum Operating Temperature Terminal Finish Nominal Voltage Gain Terminal Position Low-Offset JESD-30 Code Maximum Voltage Gain Moisture Sensitivity Level (MSL) Maximum Seated Height Width Qualification Nominal Bandwidth (3dB) JESD-609 Code Maximum Time At Peak Reflow Temperature (s) Peak Reflow Temperature (C) Length

LM321H

National Semiconductor

Instrumentation Amplifier

Commercial

Wire

8

Round

Metal

-20 V

1.5 mV

180 nA

No

1

126 dB

Bipolar

3.5 mA

Voltage Feedback

Yes

±3/±20 V

Cylindrical

CAN8,.2

40 nA

Instrumentation Amplifiers

20 V

70 °C (158 °F)

180 nA

Yes

12

0 °C (32 °F)

Tin Lead

Bottom

No

O-MBCY-W8

No

e0

LH0084CD

National Semiconductor

Instrumentation Amplifier

Other

Pin/Peg

16

DIP

Rectangular

Metal

-18 V

13 mV

100 nA

No

1

70 dB

26 mA

-15 V

15 V

±15 V

In-Line

DIP16,.3

50 nA

Instrumentation Amplifiers

13 V/us

18 V

0.1 in (2.54 mm)

85 °C (185 °F)

1

-25 °C (-13 °F)

Tin Lead

100

Dual

R-MDIP-P16

0.2 in (5.08 mm)

0.3 in (7.62 mm)

No

3.25 MHz

e0

0.98 in (24.89 mm)

Instrumentation Amplifiers

An instrumentation amplifier is an electronic circuit that amplifies small differential voltages to produce a larger output voltage signal. The main purpose of an instrumentation amplifier is to provide a high-precision and stable amplification of small signals while rejecting any common-mode noise or interference.

An instrumentation amplifier consists of three operational amplifiers (op-amps) and precision resistors. The first two op-amps are used as buffer amplifiers, and the third op-amp is used as a differential amplifier. The input signals are applied to the buffer amplifiers, which provide high input impedance and low output impedance to minimize loading effects. The differential amplifier then amplifies the difference between the two input signals, and the resulting output signal is proportional to the difference in voltage between the two input signals.

Instrumentation amplifiers are used in applications where small voltage signals need to be accurately measured or amplified. They are commonly used in industrial control systems, biomedical instrumentation, data acquisition systems, and audio equipment.

One advantage of an instrumentation amplifier is that it can be used to measure small differential voltages even in the presence of significant common-mode noise, which can be difficult to achieve with other types of amplifiers. Additionally, many instrumentation amplifiers offer a high level of accuracy, stability, and linearity, which makes them a popular choice for precision measurement applications.