Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Multi-purpose TSSOP 14

LMP2234

www.ti.com

SNOSAW4D –SEPTEMBER 2007–REVISED MARCH 2013

LMP2234 Quad Micropower, 1.6V, Precision, Operational Amplifier with CMOS Input

Check for Samples: LMP2234

FEATURES

DESCRIPTION

The LMP2234 is a quad micropower precision

(For V

= 5V, Typical Unless Otherwise Noted)

amplifier designed for battery powered applications.

• Supply Current at 1.8V 31 µA

The 1.6 to 5.5V operating supply voltage range and

• Operating Voltage Range 1.6V to 5.5V

quiescent power consumption of only 50 μW extend

the battery life in portable systems. The LMP2234 is

• Low TCV

±0.75 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 LMP2234 has a maximum offset voltage of 150

μV and 0.3 μV/°C offset drift along with low bias

• Open Loop Gain 120 dB

current of only ±20 fA. These precise specifications

• Gain Bandwidth Product 130 kHz

make the LMP2234 a great choice for maintaining

• Slew Rate 58 V/ms

system accuracy and long term stability.

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

The LMP2234 has a rail-to-rail output that swings 15

• Temperature Range –40°C to 125°C

mV from the supply voltage, which increases system

dynamic range. The common mode input voltage

range extends 200 mV below the negative supply,

APPLICATIONS

thus the LMP2234 is ideal for ground sensing in

• Precision Instrumentation Amplifiers

single supply applications.

• Battery Powered Medical Instrumentation

The LMP2234 is offered in 14-Pin SOIC and TSSOP

• High Impedance Sensors

packages.

• Strain Gauge Bridge Amplifier

• 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)

PAGE 1
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 LMP2234 Quad Micropower, 1.6V, Precision, Operational Amplifier with CMOS Input Check for Samples: LMP2234 FEATURES 1 (For VS = 5V, Typical Unless Otherwise Noted) 23 • • • • • • • • • • • • Supply Current at 1.8V 31 µA Operating Voltage Range 1.6V to 5.5V Low TCVOS ±0.
PAGE 2
LMP2234 SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 www.ti.com TYPICAL APPLICATION + + V V 3 ¼ LMP2234 + 2 + V 6 LM4140A 0.1 PF 1 PF 1,4,7,8 10 PF + V + ¼ LMP2234 R+'R 10 k: 40 k: 12 k: R + - V ADC121S021 ¼ LMP2234 1 k: R VA IN GND + R+'R V + - 12 k: ¼ LMP2234 + 10 k: 40 k: Figure 1. Strain Gauge Bridge Amplifier These devices have limited built-in ESD protection.
PAGE 3
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 Operating Ratings (1) Operating Temperature Range + (2) −40°C to 125°C – Supply Voltage (VS = V - V ) Package Thermal Resistance (θJA) 1.6V to 5.5V (2) 14-Pin SOIC 101.5 °C/W 14-Pin TSSOP (1) (2) 121 °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.
PAGE 4
LMP2234 SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 www.ti.com 5V AC Electrical Characteristics (1) Unless otherwise specified, all limits are ensured for TA = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
PAGE 5
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 3.3V DC Electrical Characteristics(1) (continued) Unless otherwise specified, all limits are 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.
PAGE 6
LMP2234 SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 www.ti.com 2.5V DC Electrical Characteristics(1) (continued) Unless otherwise specified, all limits are 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 CMRR Parameter Common Mode Rejection Ratio Conditions Min Typ 77 76 91 83 82 120 (2) 0V ≤ VCM ≤ 1.5V + PSRR Power Supply Rejection Ratio 1.6V ≤ V ≤ 5.
PAGE 7
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 1.8V DC Electrical Characteristics (1) Unless otherwise specified, all limits are 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 VOS Input Offset Voltage TCVOS Input Offset Voltage Drift Conditions Min Typ Max Units ±10 ±230 ±325 μV LMP2234A ±0.3 ±0.75 μV/°C LMP2234B ±0.3 ±2.5 ±0.02 ±1.
PAGE 8
LMP2234 SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 1.8V AC Electrical Characteristics www.ti.com (1) Unless otherwise is specified, all limits are 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.
PAGE 9
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – 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 TA = 25°C 12 VCM = VS/2 8 PERCENTAGE (%) PERCENTAGE (%) VS = 5V 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 3. Figure 4.
PAGE 10
LMP2234 SNOSAW4D – SEPTEMBER 2007 – 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.
PAGE 11
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – 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.
PAGE 12
LMP2234 SNOSAW4D – SEPTEMBER 2007 – 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. Input Bias Current vs.
PAGE 13
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – 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.
PAGE 14
LMP2234 SNOSAW4D – SEPTEMBER 2007 – 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 4.5 5 1.5 5.5 2.5 3.5 4.5 5.5 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Figure 33. Figure 34.
PAGE 15
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – 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 1k 10k Figure 40.
PAGE 16
LMP2234 SNOSAW4D – SEPTEMBER 2007 – 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.
PAGE 17
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 APPLICATION INFORMATION LMP2234 The LMP2234 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 LMP2234 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.
PAGE 18
LMP2234 SNOSAW4D – SEPTEMBER 2007 – 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 LMP2234 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 multiple amplifiers in parallel as shown in Figure 48.
PAGE 19
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – 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, the gain of the signal on the inputs, and the gain on each input of the amplifier.
PAGE 20
LMP2234 SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 www.ti.com There are two stages in this amplifier. The last stage, the output stage, is a differential amplifier. In an ideal case the two amplifiers of the first stage, the input stage, would be configured as buffers to isolate the inputs. However they cannot be connected as followers because of mismatch in amplifiers. That is why there is a balancing resistor between the two.
PAGE 21
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 Often in sensor applications at lease one of the resistors is a variable resistor, or a sensor. The deviation of this active element from its initial value is measured as an indication of change in the measured quantity. A change in output voltage represents the sensor value change. Since the sensor value change is often very small, the resulting output voltage is very small in magnitude as well.
PAGE 22
LMP2234 SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 www.ti.com + + V V 3 ¼ LMP2234 + 2 + V 6 LM4140A 0.1 PF 1 PF 1,4,7,8 10 PF + V + ¼ LMP2234 R+'R 10 k: 40 k: 12 k: R + - V ¼ LMP2234 1 k: R VA ADC121S021 IN GND + R+'R V - + 12 k: ¼ LMP2234 + 10 k: 40 k: Figure 51. Strain Gauge Bridge Amplifier PORTABLE GAS DETECTION SENSOR Gas sensors are used in many different industrial and medical applications.
PAGE 23
LMP2234 www.ti.com SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 99 k: + V 1 k: VOUT 1 k: + V - RL OXYGEN SENSOR Figure 52.
PAGE 24
LMP2234 SNOSAW4D – SEPTEMBER 2007 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision C (March 2013) to Revision D • 24 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 25
PACKAGE OPTION ADDENDUM www.ti.
PAGE 26
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.
PAGE 27
PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LMP2234AMAE/NOPB Package Package Pins Type Drawing SOIC SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) D 14 250 178.0 16.4 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 6.5 9.35 2.3 8.0 16.0 Q1 LMP2234AMAX/NOPB SOIC D 14 2500 330.0 16.4 6.5 9.35 2.3 8.0 16.0 Q1 LMP2234AMTE/NOPB TSSOP PW 14 250 178.0 12.4 6.95 8.3 1.6 8.0 12.
PAGE 28
PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMP2234AMAE/NOPB SOIC D LMP2234AMAX/NOPB SOIC D 14 250 210.0 185.0 35.0 14 2500 367.0 367.0 35.0 LMP2234AMTE/NOPB TSSOP PW LMP2234AMTX/NOPB TSSOP PW 14 250 210.0 185.0 35.0 14 2500 367.0 367.0 LMP2234BMAE/NOPB SOIC 35.0 D 14 250 210.0 185.0 35.0 LMP2234BMAX/NOPB SOIC D 14 2500 367.0 367.0 35.
PAGE 29
PAGE 30
PAGE 31
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.