Document
LMP2021/LMP2022 Zero Drift, Low Noise, EMI Hardened Amplifiers
www.DataSheet4U.com
July 23, 2009
LMP2021/LMP2022
Zero Drift, Low Noise, EMI Hardened Amplifiers
General Description
The LMP2021/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 LMP2021/LMP2022 have 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 correction circuitry guarantees impressive CMRR and PSRR, removes the 1/f noise component, and eliminates the need for calibration in many circuits. With only 260 nVPP (0.1 Hz to 10 Hz) of input voltage noise and no 1/f noise component, the LMP2021/LMP2022 are suitable for low frequency applications such as industrial precision 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 applications. 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, TA = 25°C, VS = 5V) −0.4 µV ■ Input offset voltage (typical) ±5 µV ■ Input offset voltage (max) -0.004 µV/°C ■ Input offset voltage drift (typical) ±0.02 µV/°C ■ Input offset voltage drift (max) 11 nV/√Hz ■ Input voltage noise, AV = 1000 160 dB ■ Open loop gain 139 dB ■ CMRR 130 dB ■ PSRR 2.2V to 5.5V ■ Supply voltage range 1.1 mA ■ Supply current (per amplifier) ±25 pA ■ Input bias current 5 MHz ■ GBW 2.6 V/µs ■ Slew rate −40°C to 125°C ■ Operating temperature range ■ 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
30014972
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
www.national.com
LMP2021/LMP2022
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
ESD Tolerance (Note 2) Human Body Model 2000V Machine Model 200V Charge Device Model 1000V VIN Differential ±VS Supply Voltage (VS = V+ – V−) 6.0V All Other Pins V+ + 0.3V, V− − 0.3V Output Short-Circuit Duration to V+ or V− 5s (Note 3) Storage Temperature Range −65°C to 150°C
Junction Temperature (Note 4) Soldering Information Infrared or Convection (20 sec) Wave Soldering Lead Temperature (10 sec)
150°C max 235°C 260°C
Operating Ratings
Temperature Range Supply Voltage (VS = V+ – V–)
(Note 1) −40°C to 125°C 2.2V to 5.5V 164 °C/W 106 °C/W 106 °C/W 217 °C/W
Package Thermal Resistance (θJA) 5-Pin SOT-23 8-Pin SOIC (LMP2021) 8-Pin SOIC (LMP2022) 8-Pin MSOP
2.5V Electrical Characteristics
Symbol VOS TCVOS IB IOS CMRR Parameter Input Offset Voltage Input Offset Voltage Drift (Note 8) Input Bias Current Input Offset Current Common Mode Rejection Ratio
(Note 5)
Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 2.5V, V− = 0V, VCM = V+/2, RL >10 kΩ to V+/2. Boldface limits apply at the temperature extremes. Conditions Min Typ Max (Note 7) (Note 6) (Note 7) –0.9 0.001 ±23 ±57 −0.2V ≤ VCM ≤ 1.7V 0V ≤ VCM ≤ 1.5V 105 102 −0.2 0 40 48 67 79 115 112 110 124 119 120 115 130 dB 130 150 150 dB dB ±5 ±10 ±0.02 ±100 ±300 ±200 ±250 Units μV μV/°C pA pA dB 1.7 1.5 V
141
CMVR EMIRR
Input Common-Mode Voltage Range Large Signal CMRR ≥ 105 dB Large Signal CMRR ≥ 102 dB VRF-PEAK = 100 mVP (−20 dBVP) f = 400 MHz VRF-PEAK = 100 mVP (−20 dBVP) IN+ f = 900 MHz and VRF-PEAK = 100 mVP (−20 dBVP) IN− f = 1800 MHz VRF-PEAK = 100 mVP (−20 dBVP) f = 2400 MHz Electro-Magnetic Interference Rejection Ratio (Note 9)
PSRR
Power Supply Rejection Ratio
2.5V ≤ V+ ≤ 5.5V, VCM = 0 2.2V ≤ V+ ≤ 5.5V, VCM = 0
AVOL
Large Signal Voltage Gain
RL = 10 kΩ to V+/2 VOUT = 0.5V to 2V RL = 2 kΩ to V+/2 VOUT = 0.5V to 2V
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2
LMP2021/LMP2022
Symbol Parameter www.DataSheet4U.com VOUT Output Swing High
Conditions RL = 10 kΩ to V+/2 RL = 2 kΩ to V+/2
Min Typ Max (Note 7) (Note 6) (Note 7) 38 62 30 58 30 30 50 50 0.95 2.5 5 10 60 12 12 11 15 260 330 350 50 150 1.10 1.37 50 70 85 115 45.