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LMP2232

www.ti.com

SNOSB02C –JANUARY 2008–REVISED MARCH 2013

LMP2232 Dual Micropower, 1.6V, Precision, Operational Amplifier with CMOS Input

Check for Samples: LMP2232

FEATURES

DESCRIPTION

The LMP2232 is a dual micropower precision

(For V

= 5V, Typical Unless Otherwise Noted)

amplifier designed for battery powered applications.

• Supply Current at 1.8V 16 µA

The 1.6V to 5.5V operating supply voltage range and

• Operating Voltage Range 1.6V to 5.5V

quiescent power consumption of only 26 μW extend

the battery life in portable systems. The LMP2232 is

• Low TCV

±0.5 µV/°C (max)

part of the LMP™ precision amplifier family. The high

• V

±150 µV (max)

impedance CMOS input makes it ideal for

• Input Bias Current 20 fA

instrumentation and other sensor interface

applications.

• PSRR 120 dB

• CMRR 97 dB

The LMP2232 has a maximum offset voltage of 150

μV and maximum offset voltage drift of only 0.5 μV/°C

• Open Loop Gain 120 dB

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

• Gain Bandwidth Product 130 kHz

precise specifications make the LMP2232 a great

• Slew Rate 58 V/ms

choice for maintaining system accuracy and long term

stability.

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

• Temperature Range –40°C to 125°C

The LMP2232 has a rail-to-rail output that swings 15

mV from the supply voltage, which increases system

dynamic range. The common mode input voltage

APPLICATIONS

range extends 200 mV below the negative supply,

• Precision Instrumentation Amplifiers

thus the LMP2232 is ideal for ground sensing in

• Battery Powered Medical Instrumentation

single supply applications.

• High Impedance Sensors

The LMP2232 is offered in 8-pin SOIC and VSSOP

• Strain Gauge Bridge Amplifier

packages.

• Thermocouple Amplifiers

The LMP2231 is the single version of this product

and the LMP2234 is the quad version of this product.

Both of these products are available on Texas

Instruments' website.

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 (30 pages)

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LMP2232 www.ti.com SNOSB02C – JANUARY 2008 – REVISED MARCH 2013 LMP2232 Dual Micropower, 1.6V, Precision, Operational Amplifier with CMOS Input Check for Samples: LMP2232 FEATURES 1 (For VS = 5V, Typical Unless Otherwise Noted) 23 • • • • • • • • • • • • Supply Current at 1.8V 16 µA Operating Voltage Range 1.6V to 5.5V Low TCVOS ±0.
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LMP2232 SNOSB02C – JANUARY 2008 – REVISED MARCH 2013 www.ti.com Typical Application + + V V 3 ½ LMP2232 + 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 ½ LMP2232 1 k: R 10 PF 40 k: IN + 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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LMP2232 www.ti.com SNOSB02C – 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) (2) (1) (2) 1.6V to 5.5V 8-Pin SOIC 111.2 °C/W 8-Pin VSSOP 147.4 °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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LMP2232 SNOSB02C – 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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LMP2232 www.ti.com SNOSB02C – JANUARY 2008 – REVISED MARCH 2013 3.3V DC Electrical Characteristics(1) (continued) Unless otherwise specified, all limits ensured for T A = 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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LMP2232 SNOSB02C – 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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LMP2232 www.ti.com SNOSB02C – JANUARY 2008 – REVISED MARCH 2013 1.8V DC Electrical Characteristics (1) Unless otherwise specified, all limits ensured for T A = 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 LMP2232A ±0.3 ±0.5 LMP2232B ±0.3 ±2.5 0.
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LMP2232 SNOSB02C – 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 Conditions in Input-Referred Current Noise f = 1 kHz THD+N Total Harmonic Distortion + Noise f = 100 Hz, RL = 10 kΩ Min (2) Typ (3) Max (2) Units 10 fA/√Hz 0.
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LMP2232 www.ti.com SNOSB02C – 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 VCM = VS/2 14 TA = 25°C 12 VCM = VS/2 8 PERCENTAGE (%) PERCENTAGE (%) VS = 5V 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 VOS (PV) TCVOS (PV/°C) Figure 3. Figure 4.
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LMP2232 SNOSB02C – 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 9. Figure 10.
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LMP2232 www.ti.com SNOSB02C – 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 VS = 1.8V, 2.5V, 3.3V, 5V 100 VCM = 0V 5 TYPICAL PARTS 80 80 OFFSET VOLTAGE (PV) OFFSET VOLTAGE (PV) 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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LMP2232 SNOSB02C – 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 0.5 0.75 1 VCM (V) Figure 21. Figure 22.
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LMP2232 www.ti.com SNOSB02C – 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 27. Figure 28. PSRR vs.
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LMP2232 SNOSB02C – 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− Output Swing High vs. Supply Voltage Output Swing Low vs. Supply Voltage 30 25 RL = 10 k: RL = 10 k: VOUT FROM RAIL (mV) VOUT FROM RAIL (mV) 125°C 20 85°C 25°C 15 85°C 20 15 10 2.5 3.5 -40°C 25°C -40°C 10 1.5 125°C 25 4.5 5 1.5 5.5 2.5 3.5 4.5 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Figure 33.
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LMP2232 www.ti.com SNOSB02C – JANUARY 2008 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise Specified: TA = 25°C, VS = 5V, VCM = VS/2, where VS = V+ - V− THD+N vs. Amplitude THD+N vs. Frequency 10 1 RL = 10 k: CL = 20 pF 0.1 1 VS = 2V VS = 2.5V THD+N (%) THD+N (%) VS = 2V 0.1 0.01 VS = 3.3V RL = 10 k: VO = VS ± 1V VS = 2.5V 0.01 0.001 VS = 3.3V VS = 5V VS = 5V CL = 20 pF f = 1 kHz 0.001 0.01 0.1 1 10 0.0001 1 100 1k 10k 100k Figure 40.
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LMP2232 SNOSB02C – 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− CMRR vs. Frequency Input Voltage Noise vs. Frequency 140 1000 VS = 5V VS = 2.5V 120 VOLTAGE NOISE nV/ Hz) VS = 3.3V CMRR (dB) 100 80 VS = 5V 60 40 20 0 10 100 1k 10k 100k 10 1 1 10 100 1k 10k FREQUENCY (Hz) FREQUENCY (Hz) Figure 45. 16 100 Figure 46.
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LMP2232 www.ti.com SNOSB02C – JANUARY 2008 – REVISED MARCH 2013 APPLICATION INFORMATION LMP2232 The LMP2232 is a quad CMOS precision amplifier that offers low offset voltage, low offset voltage drift, and high gain while consuming less than 10 μA of supply current per channel. The LMP2232 is a micropower op amp, consuming only 36 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.
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LMP2232 SNOSB02C – 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 47. Total Input Noise VOLTAGE NOISE REDUCTION The LMP2232 has an input voltage noise of 60nV/√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 48.
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LMP2232 www.ti.com SNOSB02C – 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 48. 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 signal on the inputs, and the gain on each input of the amplifier.
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LMP2232 SNOSB02C – 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 LMP2232.
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LMP2232 www.ti.com SNOSB02C – JANUARY 2008 – REVISED MARCH 2013 Figure 50(a) shows a typical bridge sensor and Figure 50(b) shows the bridge with four sensors. R in Figure 50(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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LMP2232 SNOSB02C – 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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LMP2232 www.ti.com SNOSB02C – JANUARY 2008 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision B (March 2013) to Revision C • 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 LMP2232AMAE/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 LMP2232AMAX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMP2232AMM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.
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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) LMP2232AMAE/NOPB SOIC D LMP2232AMAX/NOPB SOIC D 8 250 210.0 185.0 35.0 8 2500 367.0 367.0 35.0 LMP2232AMM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LMP2232AMME/NOPB VSSOP DGK 8 250 210.0 185.0 35.0 LMP2232AMMX/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0 LMP2232BMAE/NOPB SOIC D 8 250 210.0 185.0 35.
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