Input Offset Voltage Drift (PV/qC)

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24.7 k

10 k

10 k

10 k

24.7 k

Over-

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Protection

Over-

Voltage

Protection

RG

REF

+VS

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-VS

-IN

+IN

RG

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49.4 k

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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. ADVANCE INFORMATION for pre-production products; subject to

change without notice.

INA821

SBOS893 – AUGUST 2018

INA821 35-µV Offset, 7-nV/

√Hz Noise, Low-Power, Precision Instrumentation Amplifier

1

1 Features

1

•

Low Offset Voltage: 35 µV (Maximum)

•

Gain Drift: 5 ppm/°C (G = 1), 50 ppm/°C (G > 1)

•

Noise: 7 nV/

√Hz

•

Bandwidth: 5.6 MHz (G = 1), 280 kHz (G = 100)

•

Stable With 1-nF Capacitive Loads

•

Inputs Protected Up to ±40 V

•

Common-Mode Rejection: 110 dB, G = 10

(Minimum)

•

Power Supply Rejection: 110 dB, G = 1

(Minimum)

•

Supply Current: 650 µA (Maximum)

•

Supply Range:

–

Single-Supply: 4.5 V to 36 V

–

Dual-Supply: ±2.25 V to ±18 V

•

Specified Temperature Range:

–40°C to +125°C

•

Package: 8-Pin SOIC

2 Applications

•

Industrial Process Controls

•

Circuit Breakers

•

Battery Testers

•

ECG Amplifiers

•

Power Automation

•

Medical Instrumentation

•

Portable Instrumentation

3 Description

The INA821 is a high-precision instrumentation

amplifier that offers low power consumption and

operates over a wide single- or dual-supply range. A

single external resistor sets any gain from 1 to

10,000. The device has excellent precision as a result

of new super-beta input transistors, which provide low

input offset voltage, offset voltage drift, input bias

current,

and

input

voltage

and

current

noise.

Additional

circuitry

protects

the

inputs

against

overvoltage up to ±40 V.

The INA821 is optimized to provide an excellent

common-mode rejection ratio. At G = 1, the common-

mode rejection ratio exceeds 90 dB across the full

input common-mode range. The device is designed

for low-voltage operation from a 4.5-V single supply

and dual supplies up to ±18 V. The INA821 is

available in an 8-pin SOIC package and specified

over the –40°C to +125°C temperature range.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA821

SOIC (8)

4.90 mm × 3.91 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

INA821 Simplified Internal Schematic

Typical Distribution of Input Offset Voltage Drift