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LMP2231

www.ti.com

SNOSB01E –JANUARY 2008–REVISED MARCH 2013

LMP2231 Single Micropower, 1.6V, Precision Operational Amplifier with CMOS Inputs

Check for Samples: LMP2231

FEATURES

DESCRIPTION

The LMP2231 is a single micropower precision

(For V

= 5V, T

= 25°C, Typical Unless

amplifier designed for battery powered applications.

Otherwise Noted)

The 1.6V to 5.5V operating supply voltage range and

• Supply Current 10 µA

quiescent power consumption of only 16 μW extend

• Operating Voltage Range 1.6V to 5.5V

the battery life in portable battery operated systems.

The LMP2231 is part of the LMP™ precision amplifier

• TCV

(LMP2231A) ±0.4 µV/°C (max)

family. The high impedance CMOS input makes it

• TCV

(LMP2231B) ±2.5µV/°C (max)

ideal for instrumentation and other sensor interface

• V

±150 µV (max)

applications.

• Input Bias Current 20 fA

The LMP2231 has a maximum offset of 150 µV and

• PSRR 120 dB

maximum offset voltage drift of only 0.4 µV/°C along

with low bias current of only ±20 fA. These precise

• CMRR 97 dB

specifications make the LMP2231 a great choice for

• Open Loop Gain 120 dB

maintaining system accuracy and long term stability.

• Gain Bandwidth Product 130 kHz

The LMP2231 has a rail-to-rail output that swings 15

• Slew Rate 58 V/ms

mV from the supply voltage, which increases system

• Input Voltage Noise, f = 1 kHz 60 nV/√Hz

dynamic range. The common mode input voltage

range extends 200 mV below the negative supply,

• Temperature Range –40°C to 125°C

thus the LMP2231 is ideal for use in single supply

applications with ground sensing.

APPLICATIONS

The LMP2231 is offered in 5-Pin SOT-23 and 8-pin

• Precision Instrumentation Amplifiers

SOIC packages.

• Battery Powered Medical Instrumentation

The dual and quad versions of this product are also

• High Impedance Sensors

available. The dual, LMP2232 is offered in 8-pin

• Strain Gauge Bridge Amplifier

SOIC and VSSOP. The quad, LMP2234 is offered in

14-pin SOIC and TSSOP.

• Thermocouple Amplifiers

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2LMP is a trademark of Texas Instruments.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (31 pages)

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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 LMP2231 Single Micropower, 1.6V, Precision Operational Amplifier with CMOS Inputs Check for Samples: LMP2231 FEATURES 1 (For VS = 5V, TA = 25°C, Typical Unless Otherwise Noted) 23 • • • • • • • • • • • • • Supply Current 10 µA Operating Voltage Range 1.6V to 5.5V TCVOS (LMP2231A) ±0.4 µV/°C (max) TCVOS (LMP2231B) ±2.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com Typical Application + + V V 3 LMP2231 + 2 6 LM4140A 1 PF 1,4,7,8 V + 0.1 PF V + + ½ LMP2232 - R+'R 10 k: 12 k: R + - V VA IN LMP2231 1 k: R 10 PF 40 k: + ADC121S021 R+'R + V - 12 k: ½ LMP2232 + GND 10 k: 40 k: Figure 1. Strain Gauge Bridge Amplifier These devices have limited built-in ESD protection.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 Operating Ratings (1) Operating Temperature Range (2) −40°C to 125°C − + Supply Voltage (VS = V - V ) Package Thermal Resistance (θJA) (1) (2) 1.6V to 5.5V (2) 5-Pin SOT-23 160.6 °C/W 8-Pin SOIC 116.2 °C/W Absolute Maximum Ratings indicate limits beyond which damage may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not ensured.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com 5V AC Electrical Characteristics (1) Unless otherwise specified, all limits ensured for TA = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 3.3V DC Electrical Characteristics(1) (continued) Unless otherwise specified, all limits ensured for TA = 25°C, V+ = 3.3V, V− = 0V, VCM = VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com 2.5V DC Electrical Characteristics(1) (continued) Unless otherwise specified, all limits ensured for TA = 25°C, V+ = 2.5V, V− = 0V, VCM = VO = V+/2, and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions + Min (2) Typ (3) 83 83 120 Max (2) PSRR Power Supply Rejection Ratio 1.6V ≤ V ≤ 5.5V V− = 0V, VCM = 0V CMVR Common Mode Voltage Range CMRR ≥ 77 dB CMRR ≥ 76 dB −0.2 −0.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 1.8V DC Electrical Characteristics (1) Unless otherwise specified, all limits ensured for TA = 25°C, V+ = 1.8V, V− = 0V, VCM = VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Typ (3) Max (2) Units ±10 ±230 ±325 μV LMP2231A ±0.3 ±0.4 LMP2231B ±0.3 ±2.5 0.02 ±1.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com 1.8V AC Electrical Characteristics(1) (continued) Unless otherwise is specified, all limits ensured for TA = 25°C, V+ = 1.8V, V− = 0V, VCM = VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Min (2) Conditions in Input-Referred Current Noise f = 1 kHz THD+N Total Harmonic Distortion + Noise f = 100 Hz, RL = 10 kΩ Typ (3) Max (2) Units 10 fA/√Hz 0.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 Typical Performance Characteristics Unless otherwise Specified: TA = 25°C, VS = 5V, VCM = VS/2, where VS = V+ - V− Offset Voltage Distribution TCVOS Distribution 10 16 VS = 5V VS = 5V VCM = VS/2 TA = 25°C 8 VCM = VS/2 12 PERCENTAGE (%) PERCENTAGE (%) 14 10 8 6 4 -40°C d TA d 125°C 6 4 2 2 0 -150 -100 -50 0 50 100 0 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 150 TCVOS (PV/°C) VOS (PV) Figure 4. Figure 5.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise Specified: TA = 25°C, VS = 5V, VCM = VS/2, where VS = V+ - V− Offset Voltage Distribution TCVOS Distribution 25 12 VS = 1.8V VS = 1.8V TA = 25°C 10 VCM = VS/2 20 PERCENTAGE (%) PERCENTAGE (%) VCM = VS/2 8 6 4 15 10 5 2 0 -150 -40°C d TA d 125°C -100 -50 0 50 100 0 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 150 TCVOS (PV/°C) VOS (PV) Figure 10. Figure 11.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise Specified: TA = 25°C, VS = 5V, VCM = VS/2, where VS = V+ - V− Offset Voltage vs. Temperature Offset Voltage vs. Supply Voltage 120 VCM = 0V 5 TYPICAL PARTS 80 80 OFFSET VOLTAGE (PV) OFFSET VOLTAGE (PV) 100 VS = 1.8V, 2.5V, 3.3V, 5V 100 60 40 20 0 -20 -40 60 -40°C 40 25°C 20 0 85°C -20 -60 -80 -40 -20 125°C 0 20 40 60 80 100 120 TEMPERATURE (°C) -40 1.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise Specified: TA = 25°C, VS = 5V, VCM = VS/2, where VS = V+ - V− Input Bias Current vs. VCM Input Bias Current vs. VCM 10 40 VS = 2V INPUT BIAS CURRENT (pA) INPUT BIAS CURRENT (fA) 25°C 20 10 0 -40°C -10 -20 6 4 85°C 2 0 -2 -6 -8 -40 -10 0.25 0.5 1 0.75 1.25 125°C -4 -30 0 VS = 2V 8 30 0 1.5 0.25 0.5 0.75 1.25 Figure 22. Figure 23.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise Specified: TA = 25°C, VS = 5V, VCM = VS/2, where VS = V+ - V− Input Bias Current vs. VCM Input Bias Current vs. VCM 600 30 VS = 5V 400 300 200 25°C 100 0 -100 -40°C -200 1 3 2 20 125°C 15 10 5 0 -5 85°C -10 -15 -20 -25 -30 -300 0 VS = 5V 25 INPUT BIAS CURRENT (pA) INPUT BIAS CURRENT (fA) 500 4 0 1 2 VCM (V) 3 4 VCM (V) Figure 28. Figure 29. PSRR vs.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise Specified: TA = 25°C, VS = 5V, VCM = VS/2, where VS = V+ - V− Sinking Current vs. Supply Voltage Sourcing Current vs. Supply Voltage 30 40 35 25 30 -40°C -40°C ISOURCE (mA) ISINK (mA) 20 25°C 15 85°C 10 25 25°C 20 125°C 125°C 10 5 5 0 1.5 2.5 3.5 4.5 0 1.5 5.5 SUPPLY VOLTAGE (V) 2.5 3.5 4.5 5.5 SUPPLY VOLTAGE (V) Figure 32. Figure 33.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise Specified: TA = 25°C, VS = 5V, VCM = VS/2, where VS = V+ - V− Phase Margin vs. Capacitive Load 90 Slew Rate vs. Supply Voltage 60 VS = 5V RL = 100 k: SLEW RATE (V/ms) PHASE MARGIN (°) VS = 1.8V VS = 2.5V 70 60 50 20 52 48 RISING EDGE 44 RL = 10 k: VS = 3.3V 40 60 FALLING EDGE 56 80 80 40 1.5 100 2 2.5 3 3.5 4 4.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise Specified: TA = 25°C, VS = 5V, VCM = VS/2, where VS = V+ - V− Small Signal Step Response 100 mV/DIV Large Signal Step Response 1V/DIV VS = 5V VIN = 400 mVPP f = 1 kHz AV = +10 VS = 5V VIN = 50 mVPP f = 1 kHz AV = +10 RL = 10 k: RL = 10 k: CL = 20 pF CL = 20 pF 100 Ps/DIV 100 Ps/DIV Figure 44. Figure 45. CMRR vs. Frequency Input Voltage Noise vs.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 APPLICATION INFORMATION LMP2231 The LMP2231 is a single CMOS precision amplifier that offer low offset voltage and low offset voltage drift, and high gain while only consuming 10 μA of current per channel. The LMP2231 is a micropower op amp, consuming only 10 μA of current. Micropower op amps extend the run time of battery powered systems and reduce energy consumption in energy limited systems. The ensured supply voltage range of 1.8V to 5.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com VOLTAGE NOISE DENSITY (nV/ Hz) 1000 eni en 100 et 10 ei 1 0.1 10 100 1k 10k 100k 1M 10M RS (:) Figure 48. Total Input Noise VOLTAGE NOISE REDUCTION The LMP2231 has an input voltage noise of 60 nV/√Hz . While this value is very low for micropower amplifiers, this input voltage noise can be further reduced by placing N amplifiers in parallel as shown in Figure 49.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 + V + - VIN VOUT - RG RO V RF + V + RG V - RO RF + V + RG V - RO RF + V + RG V - RO RF Figure 49. Noise Reduction Circuit PRECISION INSTRUMENTATION AMPLIFIER Measurement of very small signals with an amplifier requires close attention to the input impedance of the amplifier, gain of the overall signal on the inputs, and the gain on each input of the amplifier.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com In the input stage of the circuit, current is the same across all resistors. This is due to the high input impedance and low input bias current of the LMP2231.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 Figure 51 (a) shows a typical bridge sensor and Figure 51(b) shows the bridge with four sensors. R in Figure 51(b) is the nominal value of the sense resistor and the deviations from R are proportional to the quantity being measured.
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LMP2231 SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 www.ti.com PORTABLE GAS DETECTION SENSOR Gas sensors are used in many different industrial and medical applications. They generate a current which is proportional to the percentage of a particular gas sensed in an air sample. This current goes through a load resistor and the resulting voltage drop is measured. Depending on the sensed gas and sensitivity of the sensor, the output current can be in the order of tens of microamperes to a few milliamperes.
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LMP2231 www.ti.com SNOSB01E – JANUARY 2008 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision D (March 2013) to Revision E • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LMP2231AMAE/NOPB Package Package Pins Type Drawing SOIC SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant D 8 250 178.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMP2231AMAX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMP2231AMF/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMP2231AMAE/NOPB SOIC D LMP2231AMAX/NOPB SOIC D 8 250 210.0 185.0 35.0 8 2500 367.0 367.0 35.0 LMP2231AMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMP2231AMFE/NOPB SOT-23 DBV 5 250 210.0 185.0 35.0 LMP2231AMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LMP2231BMAE/NOPB SOIC D 8 250 210.0 185.0 35.
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