INA849 Ultra-Low-Noise (1 nV/√Hz), High-Bandwidth, Instrumentation Amplifier

1 Features

• Ultra-low noise: 1-nV/√Hz input voltage noise

(typical)

• Precision super-beta input performance:

– Low offset voltage: 35 µV (maximum)

– Low offset voltage drift: 0.4 μV/°C (maximum)

– Low input bias current: 20 nA (maximum)

– Low gain drift: 5 ppm/°C for G = 1 (maximum)

• Bandwidth: 28 MHz (G = 1), 8 MHz (G = 100)

• Slew rate: 35 V/µs

• Common-mode rejection: 120 dB (minimum) for

maximum gain

• Supply range:

– Single supply: 8 V to 36 V

– Dual supply: ±4 V to ±18 V

• Specified temperature range:

–40°C to +125°C

• Packages: 8-pin SOIC and VSSOP

2 Applications

• Analog input module

• Microphone preamplifier

• Flow transmitter

• Battery test

• LCD test

• Electrocardiogram (ECG)

• Surgical equipment

• Process analytics (pH, gas, concentration, force

and humidity)

3 Description

The INA849 is an ultra-low noise instrumentation

amplifier optimized for maximum accuracy in high-

resolution systems and operation over a wide single-

supply or dual-supply range. The device offers

significantly lower input bias current than competitors

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.

Precisely matched integrated resistors provide a high,

92-dB (G = 1) common-mode rejection across the full

input common-mode range. A single external resistor

sets any gain from 1 to 10,000. The current-feedback

topology of the INA849 provides wide bandwidth at

higher gains for very-small, fast-moving signals. For

example, the device provides 8 MHz of bandwidth

at G = 100, and 28 MHz at a G = 1, with a fast

0.4-µs settling time (0.01%) for directly driving high-

resolution, analog-to-digital converters (ADCs).

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

INA849

SOIC (8)

4.90 mm × 3.91 mm

VSSOP (8)

3.00 mm × 3.00 mm

(1)

See the package option addendum at the end of the data

sheet for all available packages.

+

±

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5 k

3 k

5 k

5 k

5 k

3 k

RG

REF

+VS

íVS

OUT

+V

S

íVS

íIN

+IN

O

IN

IN

REF

V

G V

V

V

RG

R

G

100 nF

100 nF

INA849 Simplified Internal Schematic

Input-Referred Voltage Noise Spectral Density vs

Frequency

www.ti.com

INA849

SBOS945B – NOVEMBER 2020 – REVISED APRIL 2021

Copyright © 2021 Texas Instruments Incorporated

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INA849

SBOS945B – NOVEMBER 2020 – REVISED APRIL 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.