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INA125

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Instrumentation Amplifier with Precision Voltage Reference

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Data sheet

INA125

ACTIVE
Data sheet Order now

Product details

Number of channels 1 Vs (max) (V) 36 Vs (min) (V) 2.7 Input offset (±) (max) (µV) 250 Voltage gain (min) (V/V) 4 Voltage gain (max) (V/V) 10000 Noise at 1 kHz (typ) (nV√Hz) 38 Features Overvoltage protection CMRR (min) (dB) 100 Input offset drift (±) (max) (µV/°C) 2 Input bias current (±) (max) (nA) 25 Iq (typ) (mA) 0.46 Bandwidth at min gain (typ) (MHz) 0.15 Gain error (±) (max) (%) 0.5 Operating temperature range (°C) -40 to 85 Rating Catalog Type Resistor Gain nonlinearity (±) (max) (%) 0.004 Output swing headroom (to negative supply) (typ) (V) 0.4 Output swing headroom (to positive supply) (typ) (V) -0.9 Input common mode headroom (to negative supply) (typ) (V) 4.3 Input common mode headroom (to positive supply) (typ) (V) -4.8 Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 0.8
Number of channels 1 Vs (max) (V) 36 Vs (min) (V) 2.7 Input offset (±) (max) (µV) 250 Voltage gain (min) (V/V) 4 Voltage gain (max) (V/V) 10000 Noise at 1 kHz (typ) (nV√Hz) 38 Features Overvoltage protection CMRR (min) (dB) 100 Input offset drift (±) (max) (µV/°C) 2 Input bias current (±) (max) (nA) 25 Iq (typ) (mA) 0.46 Bandwidth at min gain (typ) (MHz) 0.15 Gain error (±) (max) (%) 0.5 Operating temperature range (°C) -40 to 85 Rating Catalog Type Resistor Gain nonlinearity (±) (max) (%) 0.004 Output swing headroom (to negative supply) (typ) (V) 0.4 Output swing headroom (to positive supply) (typ) (V) -0.9 Input common mode headroom (to negative supply) (typ) (V) 4.3 Input common mode headroom (to positive supply) (typ) (V) -4.8 Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 0.8
SOIC (D) 16 59.4 mm² (9.9 mm × 6 mm) PDIP (N) 16 181.42 mm² (19.3 mm × 9.4 mm)
  • LOW QUIESCENT CURRENT: 460µA
  • PRECISION VOLTAGE REFERENCE: 1.24V, 2.5V, 5V or 10V
  • SLEEP MODE
  • LOW OFFSET VOLTAGE: 250µV max
  • LOW OFFSET DRIFT: 2µV/°C max
  • LOW INPUT BIAS CURRENT: 20nA max
  • HIGH CMR: 100dB min
  • LOW NOISE: 38nV/sqrt(Hz) at f = 1kHz
  • INPUT PROTECTION TO ±40V
  • WIDE SUPPLY RANGE
    • Single Supply: 2.7V to 36V
    • Dual Supply: ±1.35V to ±18V
  • 16-PIN DIP and SO-16 SOIC PACKAGES
  • LOW QUIESCENT CURRENT: 460µA
  • PRECISION VOLTAGE REFERENCE: 1.24V, 2.5V, 5V or 10V
  • SLEEP MODE
  • LOW OFFSET VOLTAGE: 250µV max
  • LOW OFFSET DRIFT: 2µV/°C max
  • LOW INPUT BIAS CURRENT: 20nA max
  • HIGH CMR: 100dB min
  • LOW NOISE: 38nV/sqrt(Hz) at f = 1kHz
  • INPUT PROTECTION TO ±40V
  • WIDE SUPPLY RANGE
    • Single Supply: 2.7V to 36V
    • Dual Supply: ±1.35V to ±18V
  • 16-PIN DIP and SO-16 SOIC PACKAGES

The INA125 is a low power, high accuracy instrumentation amplifier with a precision voltage reference. It provides complete bridge excitation and precision differential-input amplification on a single integrated circuit.

A single external resistor sets any gain from 4 to 10,000. The INA125 is laser-trimmed for low offset voltage (250µV), low offset drift (2µV/°C), and high common-mode rejection (100dB at G = 100). It operates on single (+2.7V to +36V) or dual (±1.35V to ±18V) supplies.

The voltage reference is externally adjustable with pin-selectable voltages of 2.5V, 5V, or 10V, allowing use with a variety of transducers. The reference voltage is accurate to ±0.5% (max) with ±35ppm/°C drift (max). Sleep mode allows shutdown and duty cycle operation to save power.

The INA125 is available in 16-pin plastic DIP and SO-16 surface-mount packages and is specified for the -40°C to +85°C industrial temperature range.

The INA125 is a low power, high accuracy instrumentation amplifier with a precision voltage reference. It provides complete bridge excitation and precision differential-input amplification on a single integrated circuit.

A single external resistor sets any gain from 4 to 10,000. The INA125 is laser-trimmed for low offset voltage (250µV), low offset drift (2µV/°C), and high common-mode rejection (100dB at G = 100). It operates on single (+2.7V to +36V) or dual (±1.35V to ±18V) supplies.

The voltage reference is externally adjustable with pin-selectable voltages of 2.5V, 5V, or 10V, allowing use with a variety of transducers. The reference voltage is accurate to ±0.5% (max) with ±35ppm/°C drift (max). Sleep mode allows shutdown and duty cycle operation to save power.

The INA125 is available in 16-pin plastic DIP and SO-16 surface-mount packages and is specified for the -40°C to +85°C industrial temperature range.
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Technical documentation

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* Data sheet Instrumentation Amplifier with Precision Voltage Reference datasheet Sep 27, 2000
E-book An Engineer's Guide to Current Sensing (Rev. B) Apr 12, 2022
Application brief Simplify Voltage and Current Measurement in Battery Test Equipment (Rev. A) PDF | HTML Mar 10, 2022
Application note Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps PDF | HTML Jul 27, 2021
E-book The Signal e-book: A compendium of blog posts on op amp design topics PDF | HTML Mar 28, 2017

Design & development

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Simulation model

INA125 PSpice Model (Rev. B)

SBOM020B.ZIP (25 KB) - PSpice model
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

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 operational-amplifier (...)

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SOIC (D) 16 Ultra Librarian
PDIP (N) 16 Ultra Librarian
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