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INA128UA

Precision Instrumentation Amplifier

The INA128UA is a precision instrumentation amplifier from Texas Instruments. View the full INA128UA datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

Official INA128UA datasheet (PDF) — the source this page was extracted from.

Manufacturer

Texas Instruments

Category

Operational Amplifiers

Package

SOIC-8

INA128UA Key Specifications

ParameterValue
Noise8 nV/√Hz, 0.2 μVpp
Slew Rate1.2 V/μs
CMRR (Min)120 dB
Gain Range1 to 10,000
Input Protection±40 V
Bandwidth (G = 1)1.3 MHz
Package Body Size3.91 mm × 4.90 mm
Quiescent Current700 μA
Bandwidth (G = 100)200 kHz
Offset Voltage (Max)50 μV
Supply Voltage Range±2.25V to ±18V
Gain Equation Resistor50 kΩ
Input Bias Current (Max)5 nA
Offset Voltage Drift (Max)0.5 μV/°C
Operating Temperature Range-40°C to 125°C

INA128UA Overview

Part: INA128UA — Texas Instruments (INA12x family: INA128 / INA129)

Type: Precision, Low-Power Instrumentation Amplifier

Description: Low-power, three-op-amp instrumentation amplifier with gain set from 1 to 10,000 by one external resistor, ±2.25 V to ±18 V supply, 1.3 MHz bandwidth (G = 1), and 700 μA typical quiescent current. The UA grade has a maximum offset of ±125 ±1000/G μV.

Operating Conditions:

  • Supply voltage: 4.5–36 V single supply; ±2.25 to ±18 V dual supply
  • Specified temperature: -40 to 85 °C
  • Input common-mode range for VO = 0 V: (V-) + 2 V to (V+) - 2 V

Absolute Maximum Ratings:

  • Max supply voltage: ±18 V dual supply; 36 V single supply
  • Analog input voltage: ±40 V
  • Max junction temperature: 150 °C
  • Storage temperature: -55 to 125 °C
  • Lead temperature (soldering, 10 s): 300 °C

Key Specs:

  • Offset voltage (RTI), INA12xUA: ±25 ±100/G μV typ (CSO-independent row); ±125 ±1000/G μV max (TA = 25 °C, VS = ±15 V)
  • Offset voltage drift, INA12xUA: ±0.2 ±5/G μV/°C typ, ±1 ±20/G μV/°C max
  • Input impedance: 10 || 2 GΩ || pF differential; 100 || 9 GΩ || pF common-mode
  • Bandwidth (-3 dB): 1.3 MHz (G = 1), 640 kHz (G = 10), 200 kHz (G = 100)
  • Noise: 8 nV/√Hz at 1 kHz (CSO: SHE); 0.2 μVpp (0.1–10 Hz, CSO: SHE)
  • Slew rate (G = 5): 4 V/μs (CSO: SHE), 1.2 V/μs (CSO: FRE)
  • Quiescent current (VIN = 0 V): ±700 μA typ, ±750 μA max
  • Stable with load capacitance up to 1000 pF

Features:

  • Low offset voltage and low drift
  • Low input bias current
  • High common-mode rejection
  • Inputs protected to ±40 V
  • Wide supply range: ±2.25 V to ±18 V
  • Current-feedback input circuitry for wide bandwidth at high gain
  • Gain equation: G = 1 + 50 kΩ/RG (INA128); INA129 uses 49.4 kΩ

Applications:

  • Pressure transmitter
  • Temperature transmitter
  • Weigh scale
  • Electrocardiogram (ECG)
  • Analog input module
  • Data acquisition (DAQ)

Package:

  • D (SOIC, 8-pin), 4.9 mm × 6 mm
  • P (PDIP, 8-pin), 9.81 mm × 9.43 mm

INA128UA Features

  • Low offset voltage: 50μV, maximum
  • Low drift: 0.5μV/°C, maximum
  • Low input bias current:
  • -5nA, maximum (CSO: SHE)
  • -0.7nA, maximum (CSO: FRE)
  • Low noise: 8nV/√Hz, 0.2μVpp
  • High CMR: 120dB, minimum
  • Bandwidth: 1.3MHz (G = 1)
  • Inputs protected to ±40V
  • Wide supply range: ±2.25V to ±18V
  • Low quiescent current: 700μA
  • Packages: 8-pin plastic DIP, SO-8

INA128UA Applications

INA128UA Pin Configuration

Figure 5-1. D (8-Pin SOIC) and P (8-Pin PDIP) Packages, Top View

Table 5-1. Pin Functions

PINPINTYPE
NAMENO.TYPEDESCRIPTION
REF5InputReference input. This pin must be driven by low impedance or connected to ground.
R G1,8-Gain setting pin. For gains greater than 1, place a gain resistor between pin 1 and pin 8.
V-4PowerNegative supply
V+7PowerPositive supply
V IN-2InputNegative input
V IN+3InputPositive input
V O6OutputOutput

INA128UA Electrical Characteristics

at T A = 25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, VCM = VS / 2, and G = 1, all chips site origins (CSO) (unless otherwise noted)

PARAMETERPARAMETERTEST CONDITIONSTEST CONDITIONSTEST CONDITIONSMINTYPMAXUNIT
INPUTINPUTINPUTINPUTINPUTINPUTINPUTINPUTINPUT
V OSINA12xP, INA12xU±10 ±100 / G±50 ±500 / GμV
V OSOffset voltage (RTI)INA12xPA, INA12xUA±25 ±100 / G±125 ±1000 / GμV
V OSINA12xU±20 ±50 / G±50 ±500 / GμV
V OSINA12xUA±20 ±50 / G±125 ±1000 / GμV
Offset voltage drift (RTI)INA12xU±0.2 ±2 / G±0.5 ±20 / GμV/°C
Offset voltage drift (RTI)INA12xPA, INA12xUAINA12xPA, INA12xUA±0.2 ±5 / G±1 ±20 / GμV/°C
PSRRPower-supply rejection ratio (RTI)INA12xP, INA12xU±0.2 ±20 / G±1 ±100 / GμV/V
PSRRPower-supply rejection ratio (RTI)INA12xPA, INA12xUA±2 ±200 / GμV/V
PSRRPower-supply rejection ratio (RTI)INA12xU±0.1 ±1 / G±0.4 ±3.2 / GμV/V
PSRRPower-supply rejection ratio (RTI)
Long-term stability		INA12xUA±0.1 ±3 / G±0.8 ±6.4 / GμV/V
μV/mo
Long-term stabilityCSO: FRECSO: FRECSO: FRE±0.2 ±3 / GμV/mo
Input impedanceDifferentialDifferentialDifferential10 || 2
Input impedanceCommon-modeCommon-modeCommon-mode100 || 9GΩ || pF
V CMCommon-mode voltage (2)
Safe input voltage		V O = 0VV O = 0VV O = 0V(V-) + 2(V+) - 2
±40		V
V
CMRRCommon-mode rejection ratioINA12xP, INA12xU8086dB
CMRRCommon-mode rejection ratioINA12xPA, INA12xUA73
CMRRCommon-mode rejection ratioINA12xP, INA12xU100106
CMRRCommon-mode rejection ratioINA12xPA, INA12xUA93
CMRRCommon-mode rejection ratioINA12xP, INA12xU120125
CMRRCommon-mode rejection ratioINA12xPA, INA12xUA110
CMRRCommon-mode rejection ratioINA12xP, INA12xU120130
CMRRCommon-mode rejection ratioINA12xPA, INA12xUA
INA12xU
INA12xUA
INA12xU
INA12xUA
INA12xU
INA12xUA
INA12xU
INA12xUA		110
90
83
110
103
130
120
140
130		100
120
140
145

INA128UA Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)

MINMAXUNIT
V SSupply voltageDual supply, V S = (V+) - (V-)±18V
V SSingle supply, V S = (V+) - 0V36V
Analog input voltage
Output short-circuit (2)		Continuous±40V
T AOperating temperature-40125°C
Junction temperature150°C
Lead temperature (soldering, 10s)300°C
T stgStorage temperature-55125°C

INA128UA Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MINTYPMAXUNIT
V SSupply voltageSingle-supply4.53036V
Dual-supply±2.25±15±18V
Input common-mode voltage range for V O = 0VInput common-mode voltage range for V O = 0V(V-) + 2(V+) - 2V
T ASpecified temperatureSpecified temperature-4085°C

INA128UA Thermal Information

THERMAL METRIC (1)INA12x - D (SOIC) - 8 PINSINA12x - P (PDIP) - 8 PINSUNIT
R θJAJunction-to-ambient thermal resistance11046.1°C/W
R θJC(top)Junction-to-case (top) thermal resistance5734.1°C/W
R θJBJunction-to-board thermal resistance5423.4°C/W
ψ JTJunction-to-top characterization parameter1111.3°C/W
ψ JBJunction-to-board characterization parameter5323.2°C/W

INA128UA Typical Application

The INA12x measure a small differential voltage with a high common-mode voltage developed between the noninverting and inverting input. The high input-voltage protection circuit in conjunction with high input impedance make the INA12x an excellent choice for a wide range of applications. The ability to set the reference pin to adjust the functionality of the output signal offers additional flexibility that is practical for multiple configurations.

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  • AD623ARZ-RL – Analog Devices, Rail-to-Rail Instrumentation Amplifier
  • AD623B – Analog Devices, Rail-to-Rail Instrumentation Amplifier
  • AD623BNZ – Analog Devices, Rail-to-Rail Instrumentation Amplifier

All Operational Amplifiers datasheetsAll Texas Instruments datasheets (2,442)

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