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INA851

ACTIVE

Low-noise (3.2 nV/√Hz) high-speed (22 MHz) fully-differential instrumentation amp with OVP (±40 V)

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Data sheet

INA851

ACTIVE
Data sheet Order now

Product details

Number of channels 1 Vs (max) (V) 36 Vs (min) (V) 8 Input offset (±) (max) (µV) 35 Voltage gain (min) (V/V) 0.2 Voltage gain (max) (V/V) 1000 Noise at 1 kHz (typ) (nV√Hz) 3.2 Features Fully Differential, Overvoltage protection, Small Size, Super-beta, Ultra-low noise CMRR (min) (dB) 120 Input offset drift (±) (max) (µV/°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 125 Rating Catalog Type Resistor Gain nonlinearity (±) (max) (%) 0.0002 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 to 10 Hz (typ) (µVPP) 0.1
Number of channels 1 Vs (max) (V) 36 Vs (min) (V) 8 Input offset (±) (max) (µV) 35 Voltage gain (min) (V/V) 0.2 Voltage gain (max) (V/V) 1000 Noise at 1 kHz (typ) (nV√Hz) 3.2 Features Fully Differential, Overvoltage protection, Small Size, Super-beta, Ultra-low noise CMRR (min) (dB) 120 Input offset drift (±) (max) (µV/°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 125 Rating Catalog Type Resistor Gain nonlinearity (±) (max) (%) 0.0002 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 to 10 Hz (typ) (µVPP) 0.1
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
  • Low offset voltage: 10 µV (typ), 35 µV (max)
  • Low offset drift: 0.1 µV/°C (typ), 0.3 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)
  • Input overvoltage protection to ±40 V beyond supplies
  • 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 VQFN
  • Gain programmable from G = 0.2 to 10,000 by using external resistor
  • Fully differential outputs with integrated clamping
  • Low offset voltage: 10 µV (typ), 35 µV (max)
  • Low offset drift: 0.1 µV/°C (typ), 0.3 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)
  • Input overvoltage protection to ±40 V beyond supplies
  • 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 VQFN

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 can 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. Additional circuitry protects the device inputs against overvoltage up to ±40 V beyond the power-supply voltages.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 either an 8-V minimum single or ±4-V dual supply, and a maximum of 36-V single or ±18 V dual supply.

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 can 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. Additional circuitry protects the device inputs against overvoltage up to ±40 V beyond the power-supply voltages.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 either an 8-V minimum single or ±4-V dual supply, and a maximum of 36-V single or ±18 V dual supply.
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Technical documentation

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* Data sheet INA851 Precision, Low-Noise, Fully Differential Output Instrumentation Amplifier With Attenuating Gain and Output Clamping datasheet (Rev. A) PDF | HTML 26 Oct 2022
Application brief Optimizing Strain Gauge Accuracy With INA851 vs. Discrete Design PDF | HTML 14 Nov 2023
Product overview First High-Precision Instrumentation Amplifier With Fully- Differential Outputs PDF | HTML 06 Oct 2023
Product overview PLC Analog Input Front-End Architectures PDF | HTML 31 Jul 2022

Design & development

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Evaluation board

INA851EVM — INA851 evaluation module for low-noise high-speed fully-differential instrumentation amplifier

The INA851EVM evaluation module (EVM) provides access to the features and measures the performance of the INA851. The INA851 is a high-precision instrumentation amplifier with differential outputs that is optimized to drive high-performance analog-to-digital converters (ADCs) with fully (...)

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INA851 PSpice Model

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INA851 TINA-TI Reference Design

SBOMC51.TSC (49 KB) - TINA-TI Reference Design
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INA851 TINA-TI Spice Model

SBOMC52.ZIP (16 KB) - TINA-TI Spice 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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INA851-INPUT-OUTPUT-RANGE-DESIGN-CALC — INA851 input and output range design calculator

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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 (...)
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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 (...)
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