INA128:Precision, 130-dB CMRR, 700-?A, Low-Power, Instrumentation Amplifier

Recommended alternative parts
  • INA129 - ?Identical performance with different gain equation.
  • INA131 - ?Improve input offset

The INA128 and INA129 are low-power, general purpose instrumentation amplifiers offering excellent accuracy. The versatile 3-op amp design and small size make these amplifiers ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200 kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000. The INA128 provides an industry-standard gain equation; the INA129 gain equation is compatible with the AD620.

The INA12x is laser-trimmed for very low offset voltage (50 ?V), drift (0.5 ?V/°C) and high common-mode rejection (120 dB at G ≥ 100). The INA12x operates with power supplies as low as ±2.25 V, and quiescent current is only 700 ?A, ideal for battery-operated systems. Internal input protection can withstand up to ±40 V without damage.

The INA12x is available in 8-pin plastic DIP and SO-8 surface-mount packages, specified for the –40°C to 85°C temperature range. The INA128 is also available in a dual configuration, the INA2128.

  • Low Offset Voltage: 50 ?V Maximum
  • Low Drift: 0.5 ?V/°C Maximum
  • Low Input Bias Current: 5 nA Maximum
  • High CMR: 120 dB minimum
  • Inputs Protected to ±40 V
  • Wide Supply Range: ±2.25 V to ±18 V
  • Low Quiescent Current: 700 ?A
  • 8-PIN Plastic Dip, SO-8
Number of Channels (#)11
Vs (Min) (V)4.54.5
Vs (Max) (V)3636
CMRR (Min) (dB)120120
Input Offset (+/-) (Max) (uV)5050
Input Offset Drift (+/-) (Max) (uV/C)0.50.5
Input Bias Current (+/-) (Max) (nA)55
Noise at 1kHz (Typ) (nV/rt(Hz))88
Iq (Typ) (mA)0.70.7
Bandwidth at Min Gain (Typ) (MHz)1.31.3
Gain (Min) (V/V)11
Gain (Max) (V/V)1000010000
Gain Error (+/-) (Max) (%)22
Operating Temperature Range (C)-40 to 125-40 to 125
Approx. Price (US$)3.41 | 1ku
Package Size: mm2:W x L (PKG)See datasheet (PDIP)See datasheet (PDIP)
Noise at 0.1 Hz - 10 Hz (Typ) (uVpp)0.20.2
Gain Non-Linearity (+/-) (Max) (%)0.0120.002
TitleTypeSize (KB)Date
INA12x Precision, Low Power Instrumentation Amplifiers (Rev. C)PDF154301 Apr 2015
Application notes?(2)
TitleTypeSize (KB)Date
A Numerical Protection Relay SolutionPDF18702 Sep 2010
Getting the most out of your instrumentation amplifier designPDF17710 Oct 2005
User guides?(2)
TitleTypeSize (KB)Date
Instrumentation Amplifier With DC Rejection Design GuidePDF108014 May 2015
Universal Instrumentation Amplifier EVM User’s GuidePDF72111 Sep 2013
Selection & solution guides?(2)
TitleTypeSize (KB)Date
Analog Signal Chain Guide (Rev. B)PDF600011 Jul 2013
TI HealthTech Fitness GuidePDF359410 Apr 2013
TitleTypeSize (KB)Date
INA128 PSpice ModelZIP39?KB21 Jun 2012
INA128 TINA TI Reference DesignTSC88?KB21 Jun 2012
INA128 TINA TI Spice ModelZIP5?KB21 Jun 2012
Design kits & evaluation modules?(1)
Universal Instrumentation Amplifier Evaluation ModuleINAEVMEvaluation Modules & Boards
Development tools?(2)
Calculate Input Common-Mode Range of Instrumentation AmplifiersINA-CMV-CALCCalculation Tools
SPICE-Based Analog Simulation ProgramTINA-TICircuit Design & Simulation
Ordering Information
Part #Preproduction / Production MaterialStatusTemp(oC)Price | QTYPackage | PinsDevice MarkingPackage QTY | Carrier
INA128PProductionACTIVE6.05 | 1kuPDIP?(P)INA128P50 | TUBE
INA128PAProductionACTIVE3.92 | 1kuPDIP?(P)INA128P A50 | TUBE
INA128PAG4ProductionACTIVE3.92 | 1kuPDIP?(P)INA128P A50 | TUBE
INA128PG4ProductionACTIVE6.05 | 1kuPDIP?(P)INA128P50 | TUBE
INA128UProductionACTIVE6.26 | 1kuSOIC?(D)INA 128U75 | TUBE
INA128U/2K5ProductionACTIVE5.53 | 1kuSOIC?(D)INA 128U2500 | LARGE T&R
INA128U/2K5G4ProductionACTIVE5.53 | 1kuSOIC?(D)INA 128U2500 | LARGE T&R
INA128UAProductionACTIVE-40 to 1254.14 | 1kuSOIC?(D)INA 128U A75 | TUBE
INA128UA/2K5ProductionACTIVE-40 to 1253.41 | 1kuSOIC?(D)INA 128U A2500 | LARGE T&R
INA128UA/2K5E4ProductionACTIVE-40 to 1253.41 | 1kuSOIC?(D)INA 128U A2500 | LARGE T&R
INA128UA/2K5G4ProductionACTIVE-40 to 1253.41 | 1kuSOIC?(D)INA A 128U2500 | LARGE T&R
INA128UAE4ProductionACTIVE-40 to 1254.14 | 1kuSOIC?(D)INA A 128U75 | TUBE
INA128UAG4ProductionACTIVE-40 to 1254.14 | 1kuSOIC?(D)INA 128U A75 | TUBE
INA128UG4ProductionACTIVE6.26 | 1kuSOIC?(D)INA 128U75 | TUBE
INA12x Precision, Low Power Instrumentation Amplifiers INA128
所选封装材料的热学和电学性质 DCP010505B
使您的仪器放大器设计达到最佳效果 ADS8321
A Numerical Protection Relay Solution ADS8558
Instrumentation Amplifier With DC Rejection Design Guide INA128
Universal Instrumentation Amplifier EVM User’s Guide INA118
模拟信号链路产品指南 (Rev. B) BQ24392
TI HealthTech Fitness Guide ADS1298ECGFE-PDK
INA128 PSpice Model INA128
INA128 TINA TI Reference Design INA128
INA128 TINA TI Spice Model INA128
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