Product details

Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 8 Input offset (+/-) (Max) (uV) 35 Gain (Min) (V/V) 0.2 Gain (Max) (V/V) 1000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 3.2 Features Fully differential, Overvoltage Protection, Small Size, Super-beta, Ultra-low noise CMRR (Min) (dB) 120 Input offset drift (+/-) (Max) (uV/C) 0.4 Input bias current (+/-) (Max) (nA) 20 Iq (Typ) (mA) 6 Bandwidth at min gain (Typ) (MHz) 22 Gain error (+/-) (Max) (%) 0.15 Operating temperature range (C) -40 to 85 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 1.4 Output swing headroom (to positive supply) (Typ) (V) -1.4 Input common mode headroom (to negative supply) (Typ) (V) 2.5 Input common mode headroom (to positive supply) (Typ) (V) -2.5 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.1 Gain non-linearity (+/-) (Max) (%) 0.0002
Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 8 Input offset (+/-) (Max) (uV) 35 Gain (Min) (V/V) 0.2 Gain (Max) (V/V) 1000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 3.2 Features Fully differential, Overvoltage Protection, Small Size, Super-beta, Ultra-low noise CMRR (Min) (dB) 120 Input offset drift (+/-) (Max) (uV/C) 0.4 Input bias current (+/-) (Max) (nA) 20 Iq (Typ) (mA) 6 Bandwidth at min gain (Typ) (MHz) 22 Gain error (+/-) (Max) (%) 0.15 Operating temperature range (C) -40 to 85 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 1.4 Output swing headroom (to positive supply) (Typ) (V) -1.4 Input common mode headroom (to negative supply) (Typ) (V) 2.5 Input common mode headroom (to positive supply) (Typ) (V) -2.5 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.1 Gain non-linearity (+/-) (Max) (%) 0.0002
VQFN (RGT) 16 9 mm² 3 x 3
  • Gain programmable from G = 0.2 to 10,000 by using external resistor
  • Fully differential outputs with integrated clamping
  • Input overvoltage protection to ±40 V beyond supplies at G = 1
  • Low offset voltage: 10 µV (typ), 35 µV (max)
  • Low offset drift: 0.1 µV/°C (typ), 0.4 µV/°C (max)
  • Low input bias current: 5 nA (typ)
  • Input stage noise: 3.2 nV/√Hz, 0.8 pA/√Hz
  • Wide bandwidth: 22 MHz at G = 0.2, 15 MHz at G = 1
  • Common-mode rejection: 106 dB (min) at G = 10, 120 dB (min) at 100 ≤ G ≤ 1000
  • Power supply rejection: 110 dB (min) at G = 1
  • Supply current: 6 mA (typ)
  • Supply range:
    • Single supply: 8 V to 36 V
    • Dual supply: ±4 V to ±18 V
  • Specified temperature range: –40°C to +125°C
  • Tiny package: 16-pin RGT
  • Gain programmable from G = 0.2 to 10,000 by using external resistor
  • Fully differential outputs with integrated clamping
  • Input overvoltage protection to ±40 V beyond supplies at G = 1
  • Low offset voltage: 10 µV (typ), 35 µV (max)
  • Low offset drift: 0.1 µV/°C (typ), 0.4 µV/°C (max)
  • Low input bias current: 5 nA (typ)
  • Input stage noise: 3.2 nV/√Hz, 0.8 pA/√Hz
  • Wide bandwidth: 22 MHz at G = 0.2, 15 MHz at G = 1
  • Common-mode rejection: 106 dB (min) at G = 10, 120 dB (min) at 100 ≤ G ≤ 1000
  • Power supply rejection: 110 dB (min) at G = 1
  • Supply current: 6 mA (typ)
  • Supply range:
    • Single supply: 8 V to 36 V
    • Dual supply: ±4 V to ±18 V
  • Specified temperature range: –40°C to +125°C
  • Tiny package: 16-pin RGT

The INA851 is the industry’s first high-precision instrumentation amplifier with fully differential outputs. This device is optimized to drive inputs of modern high performance analog-to-digital converters (ADCs) with fully differential inputs. The INA851 operates over a very-wide, single-supply or dual-supply range. The output stage gain may be set to either 0.2 or to 1 by shorting or floating two pins. A single external resistor sets any input stage gain from 1 to 10,000.

Compared to other amplifiers in the same class, the INA851 offers very-low input bias current and low input-referred current noise as a result of super-beta input transistors. A state-of-the-art manufacturing process provides exceptionally low voltage noise, input offset voltage, and offset voltage drift. The device outputs feature built-in clamping circuitry to protect the ADC or downstream device against overdrive damage.

The device is designed for operation from an 8-V minimum single supply, as well as with dual supplies up to ±18 V.

The INA851 is the industry’s first high-precision instrumentation amplifier with fully differential outputs. This device is optimized to drive inputs of modern high performance analog-to-digital converters (ADCs) with fully differential inputs. The INA851 operates over a very-wide, single-supply or dual-supply range. The output stage gain may be set to either 0.2 or to 1 by shorting or floating two pins. A single external resistor sets any input stage gain from 1 to 10,000.

Compared to other amplifiers in the same class, the INA851 offers very-low input bias current and low input-referred current noise as a result of super-beta input transistors. A state-of-the-art manufacturing process provides exceptionally low voltage noise, input offset voltage, and offset voltage drift. The device outputs feature built-in clamping circuitry to protect the ADC or downstream device against overdrive damage.

The device is designed for operation from an 8-V minimum single supply, as well as with dual supplies up to ±18 V.

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Technical documentation

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Type Title Date
* Data sheet INA851 Precision, Low-Noise, Fully Differential Output Instrumentation Amplifier With Optional Attenuating Gain datasheet PDF | HTML 08 Mar 2022
User guide INA851EVM Evaluation Module User's Guide PDF | HTML 24 Feb 2022
Technical article What is an instrumentation amplifier? 09 Aug 2019
Technical article How to layout a PCB for an instrumentation amplifier 14 Oct 2016
Technical article Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) 25 Nov 2013

Design & development

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Evaluation board

INA851EVM — INA851 evaluation module high-precision, fully differential instrumentation amp, 3-nV/√Hz low noise

This INA851EVM evaluation module (EVM) is designed to measure the performance of the INA851 device and provides access to the device’s features. The INA851 device is a high-precision instrumentation amplifier with differential outputs and is optimized to drive high-performance (...)

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Simulation model

INA851 PSpice Model

SBOMC50.ZIP (101 KB) - PSpice Model
Simulation model

INA851 TINA-TI Reference Design

SBOMC51.TSC (49 KB) - TINA-TI Reference Design
Simulation model

INA851 TINA-TI Spice Model

SBOMC52.ZIP (16 KB) - TINA-TI Spice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

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 (...)
Calculation tool

ANALOG-ENGINEER-CALC — 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 op-amp gain with feedback (...)
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VQFN (RGT) 16 View options

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