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Product details

Parameters

Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 4 Input offset (+/-) (Max) (uV) 55 Gain (Min) (V/V) 1 Gain (Max) (V/V) 1000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 12.5 CMRR (Min) (dB) 118 Input offset drift (+/-) (Max) (uV/C) 0.2 Input bias current (+/-) (Max) (nA) 2.5 Iq (Typ) (mA) 1.4 Bandwidth at min gain (Typ) (MHz) 0.6 Gain error (+/-) (Max) (%) 0.5 Operating temperature range (C) -40 to 125 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.25 open-in-new Find other Instrumentation amplifiers

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 WSON (DRJ) 8 16 mm² 4 x 4 open-in-new Find other Instrumentation amplifiers

Features

  • Excellent DC Performance:
    • Low Input Offset Voltage: 55 µV (max)
    • Low Input Offset Drift: 0.2 µV/°C (max)
    • High CMRR: 104 dB, G ≥ 10 (min)
  • Low Input Noise:
    • 12 nV/√Hz at 1 kHz
    • 0.25 µVPP (0.1 Hz to 10 Hz)
  • Wide Supply Range:
    • Single Supply: 4 V to 36 V
    • Dual Supply: ±2 V to ±18 V
  • Gain Set with a Single External Resistor:
    • Gain Equation: G = 1 + (50 kΩ / RG)
    • Gain Error: 0.007%, G = 1
    • Gain Drift: 5 ppm/°C (max) G = 1
  • Input Voltage: (V–) + 0.1 V to (V+) – 1.5 V
  • RFI-Filtered Inputs
  • Rail-to-Rail Output
  • Low Quiescent Current: 1.4 mA
  • Operating Temperature: –55°C to +150°C
  • SOIC-8 and DFN-8 Packages
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Description

The INA188 is a precision instrumentation amplifier that uses TI proprietary auto-zeroing techniques to achieve low offset voltage, near-zero offset and gain drift, excellent linearity, and exceptionally low-noise density (12 nV/√Hz) that extends down to dc.

The INA188 is optimized to provide excellent common-mode rejection of greater than 104 dB (G ≥ 10). Superior common-mode and supply rejection supports high-resolution, precise measurement applications. The versatile three op-amp design offers a rail-to-rail output, low-voltage operation from a 4-V single supply as well as dual supplies up to ±18 V, and a wide, high-impedance input range. These specifications make this device ideal for universal signal measurement and sensor conditioning (such as temperature or bridge applications).

A single external resistor sets any gain from 1 to 1000. The INA188 is designed to use an industry-standard gain equation: G = 1 + (50 kΩ / RG). The reference pin can be used for level-shifting in single-supply operation or for an offset calibration.

The INA188 is specified over the temperature range of –40°C to +125°C .

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Exact equivalent in functionality and parametrics to the compared device:
INA828 ACTIVE 50-μV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier For higher precision (50uV offset), better CMRR (140dB), and lower gain error (0.15%) see the INA828

Technical documentation

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Type Title Date
* Datasheet INA188 Precision, Zero-Drift, Rail-to-Rail Out, High-Voltage Instrumentation Amplifier datasheet Sep. 22, 2015
White papers Designing an Accurate, Multifunction Lithium-Ion Battery-Testing Solution Sep. 24, 2020
White papers Simplifying Current Sensing (Rev. A) Jan. 09, 2020
Technical articles What is an instrumentation amplifier? Aug. 09, 2019
Technical articles Achieving highly accurate full-scale charge and discharge current control for high-cell Li-ion battery-formation testing Aug. 13, 2018
Technical articles How to charge and discharge battery test equipment Apr. 11, 2018
Application notes Simplify Voltage and Current Measurement in Battery Test Equipment Oct. 16, 2017
Application notes Offset Correction Methods: Laser Trim, e-Trim, and Chopper (Rev. A) Jul. 20, 2017
White papers The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Technical articles How to layout a PCB for an instrumentation amplifier Oct. 14, 2016
User guides Universal Instrumentation Amplifier EVM User’s Guide (Rev. B) Aug. 09, 2016
User guides Single-Supply Thermocouple with RTD Base Cold-Junction Compensation Design Guide Jul. 08, 2016
User guides High Accuracy AC Current Measurement Using PCB Rogowski Coil Sensor Design Guide (Rev. A) Jul. 05, 2016
Application notes Using op amps to reduce near-field EMI on PCBs Jan. 26, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
Description

The universal INAEVM (Instrumentation Amplifier Evaluation Module) is available in two package options that simplify prototyping precision instrumentation amplifiers in either the SO-8 (D) package or the MSOP-8(DGK) package with the pinout shown.  See the chart below for compatible TI INA’s. Note (...)

Design tools & simulation

SIMULATION MODELS Download
SBOM949A.ZIP (20 KB) - PSpice Model
SIMULATION MODELS Download
SBOM953.TSC (41 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SBOM954.TSM (34 KB) - TINA-TI Spice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
CALCULATION TOOLS Download
Analog engineer's calculator
ANALOG-ENGINEER-CALC — The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
Features
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)
CALCULATION TOOLS Download
Common-Mode Input Range Calculator for Instrumentation Amplifiers
INA-CMV-CALC The Common-Mode Input Range Calculator is tool for quickly generating plots of an instrumentation amplifier’s common-mode input range vs output. The tool is compatible with both 2-amp and 3-amp instrumentation amplifiers utilizing any supply range.

The Common-Mode Input Range Calculator is pre-loaded (...)

Features
  • Preloaded with 20 of TI’s most popular instrumentation amplifier specifications
  • Customizable supply, gain, and voltage reference options
  • Calculator displays output limitations graphically and numerically
SCHEMATICS Download
TIDRL23.PDF (230 KB)
SCHEMATICS Download
TIDRM37.PDF (373 KB)

Reference designs

REFERENCE DESIGNS Download
High accuracy analog input module reference design with 16-bit 1-MSPS dual simultaneous-sampling ADC
TIDA-01576 — This reference design accurately measures 16-channel AC voltage and current inputs using a precision 16-bit SAR ADC over a wide input range. This range covers protection and measurement requirements (including sampling requirements as per IEC 61850-9-2), which simplifies system design and improves (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Accuracy Analog Front End Using 16-Bit SAR ADC with ±10V Measurement Range Reference Design
TIDA-00834 — The TIDA-00834 reference design accurately measures voltage and current inputs using simultaneously sampled, 16-bit, ±10 V, bipolar input SAR ADC critical to identify power systems malfunction and power quality related failures accurately and quickly. This results in reduced power systems (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Battery Tester Reference Design for High Current Applications
TIDA-01040 — Li-Ion battery formation and electrical testing require accurate voltage and current control, usually to better than ±0.05% over the specified temperature range.  This reference design proposes a solution for high-current (up to 50 A) battery tester applications supporting input (bus (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
6A, 0.05% Current Accuracy Power Solution for Battery Test Systems Reference Design
PMP15043 — This reference design circuit introduces a highly accurate, bi-directional current power solution used in battery test systems (BTS). The maximum current capability is 6A with lower than 0.05% full scale accuracy. Controlling through a logic pin, the circuit can be used to charge or discharge a (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
50A, 0.05% Current Accuracy Power Reference Design for Battery Test Systems
PMP15038 — This reference design introduces a large current, highly accurate and bi-directional power solution used in battery test systems (BTS). It includes a LM5170EVM-BIDIR and a signal control board. The LM5170EVM-BIDIR is an evaluation board  to showcase the high performance of the dual-channel (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Single-Supply Thermocouple Amplifier with RTD Based Cold Junction Compensation Reference Design
TIPD209 — This TI Design uses a thermocouple to measure temperatures from -50 °C to 500 °C. The design uses cold junction compensation to reduce errors associated with changes in the cold junction temperature of the thermocouple. The design operates on a single 24 V supply and has a linear output (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Accuracy AC Current Measurement Reference Design using PCB Rogowski Coil Sensor
TIDA-01063 — TIDA-01063 is a reference design for current sensing using a PCB Rogowski Coil sensor to achieve very good linearity for wide measurement range at very low system BOM cost. PCB Rogowski sensor is advantageous for isolated current measurement due to very high bandwidth of 20 MHz and fast settling (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
3-Terminal PLC Reference Design
TIPD195 This design inputs ±10V or ±20mA and outputs 2.5V±2.3V. It utilizes the INA188, which is a zero-drift instrumentation amplifier. The 2.5V reference voltage is provided by the REF3225. Measured performance yielded just 0.153% error (typical).
document-generic Schematic document-generic User guide
Design files

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
SON (DRJ) 8 View options

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