LMP2021_15 Datasheet, PDF (1/37 Pages) Texas Instruments – LMP202x Zero-Drift, Low-Noise, EMI-Hardened Amplifiers

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LMP2021, LMP2022
SNOSAY9F – SEPTEMBER 2008 – REVISED DECEMBER 2014
LMP202x Zero-Drift, Low-Noise, EMI-Hardened Amplifiers
1 Features
1(Typical Values, T_A = 25°C, V_S = 5 V)
• 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 2.2 V to 5.5 V
• 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 VSSOP and 8-Pin SOIC
Packages
2 Applications
• Precision Instrumentation Amplifiers
• Battery Powered Instrumentation
• Thermocouple Amplifiers
• Bridge Amplifiers
3 Description
The LMP2021 and LMP2022 are single and dual
precision operational 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 LMP202x has only 0.004 µV/°C of input offset
voltage drift, and 0.4 µV of input offset voltage. These
attributes provide great precision in high accuracy
applications.
The proprietary continuous auto zero correction
circuitry ensures impressive CMRR and PSRR,
removes the 1/f noise component, 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 LMP202x are
suitable for low frequency applications such as
industrial precision weigh scales. The extremely high
open loop gain of 160 dB drastically reduces gain
error in high gain applications. With ultra precision
DC specifications and very low noise, the LMP202x
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
VSSOP and 8-Pin SOIC packages.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LMP2021
SOIC (8)
SOT-23 (5)
4.90 mm x 3.91 mm
2.90 mm x 1.60 mm
LMP2022
SOIC (8)
VSSOP (8)
4.90 mm x 3.91 mm
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
EMI
R1
R4
R2
R3
Bridge Amplifier
VA
+
1/2
LMP2022
-
0.1 PF
280:
VA
0.1 PF
- _1/2
LMP2022
+
200:
5.1 k:
0.1%
5.1 k:
0.1%
200:
1 k:
VA
-
LMP2021
+
1 k:
VA = 5V
470 pF
180:
VA
+
ADC161S626
-
VR = 1/2 VA
The LMP202x support systems with up to 24 bits of accuracy.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.