LMP2021 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – Zero Drift, Low Noise, EMI Hardened Amplifiers

LMP2021/LMP2022
July 23, 2009
Zero Drift, Low Noise, EMI Hardened Amplifiers
General Description
The LMP2021/LMP2022 are single and dual precision oper-
ational amplifiers offering ultra low input offset voltage, near
zero input offset voltage drift, very low input voltage noise and
very high open loop gain. They are part of the LMP^® precision
family and are ideal for instrumentation and sensor interfaces.
The LMP2021/LMP2022 have only 0.004 µV/°C of input offset
voltage drift, and 0.4 µV of input offset voltage. These at-
tributes provide great precision in high accuracy applications.
The proprietary continuous correction circuitry guarantees
impressive CMRR and PSRR, removes the 1/f noise compo-
nent, and eliminates the need for calibration in many circuits.
With only 260 nV_PP (0.1 Hz to 10 Hz) of input voltage noise
and no 1/f noise component, the LMP2021/LMP2022 are suit-
able for low frequency applications such as industrial preci-
sion weigh scales. The low input bias current of 23 pA makes
these excellent choices for high source impedance circuits
such as non-invasive medical instrumentation as well as test
and measurement equipment. The extremely high open loop
gain of 160 dB drastically reduces gain error in high gain ap-
plications. With ultra precision DC specifications and very low
noise, the LMP2021/LMP2022 are ideal for position sensors,
bridge sensors, pressure sensors, medical equipment and
other high accuracy applications with very low error budgets.
The LMP2021 is offered in 5-Pin SOT-23 and 8-Pin SOIC
packages. The LMP2022 is offered in 8-Pin MSOP and 8-Pin
SOIC packages.
Features
(Typical Values, T_A = 25°C, V_S = 5V)
■ ^{Input offset voltage (typical)}
−0.4 µV
■ ^{Input offset voltage (max)}
±5 µV
■ ^{Input offset voltage drift (typical)}
-0.004 µV/°C
■ ^{Input offset voltage drift (max)}
±0.02 µV/°C
■ ^{Input voltage noise, A}_V ^{= 1000}
11 nV/√Hz
■ ^{Open loop gain}
160 dB
■ ^CMRR
139 dB
■ ^PSRR
130 dB
■ ^{Supply voltage range}
2.2V to 5.5V
■ ^{Supply current (per amplifier)}
1.1 mA
■ ^{Input bias current}
±25 pA
■ ^GBW
5 MHz
■ ^{Slew rate}
2.6 V/µs
■ ^{Operating temperature range}
−40°C to 125°C
■ ^{5-Pin SOT-23, 8-Pin MSOP and 8-Pin SOIC Packages}
Applications
■ ^{Precision instrumentation amplifiers}
■ ^{Battery powered instrumentation}
■ ^{Thermocouple amplifiers}
■ ^{Bridge amplifiers}
Typical Application
Bridge Amplifier
The LMP2021/LMP2022 support systems with up to 24 bits of accuracy.
LMP^® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation 300149
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www.national.com