INA823 Precision, Low-Power, Wide-Supply (2.7-V to 36-V) Instrumentation Amplifier

1 Features

• Input overvoltage protection up to ±60 V

• Input voltage extends 150 mV below negative

supply

• Low-power supply current: 250 µA (max)

• Precision performance:

– Low offset voltage: 40 µV (typ), 100 µV (max)

– Low input bias current: 10 nA (max)

– Input voltage noise: 21 nV/√Hz

– Common-mode rejection:

• 84 dB, G = 1 (min)

• 104 dB, G = 10 (min)

• 120 dB, G ≥ 100 (min)

– Power supply rejection: 100 dB, G = 1 (min)

• Bandwidth: 1.9 MHz (G = 1), 60 kHz (G = 100)

• Stable with 1-nF capacitive loads

• Supply range:

– Single-supply: 2.7 V to 36 V

– Dual-supply: ±1.35 V to ±18 V

• Specified temperature range: –40°C to +125°C

• Packages: 8-pin SOIC and 8-pin VSSOP

2 Applications

• Flow transmitter

• Wearable fitness and activity monitor

• Infusion pump

• Blood glucose monitor

• Weigh scale

• Analog input module

• Electrocardiogram (ECG)

3 Description

The INA823 is an integrated instrumentation amplifier

that offers low power consumption and operates over

a wide, single-supply or dual-supply range. A single

external resistor sets any gain from 1 to 1,000. The

device provides low input offset voltage, low offset

voltage drift, low input bias current, and low current

noise. Additional circuitry protects the inputs against

overvoltage up to ±60 V.

The INA823 is optimized to provide a high common-

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

rejection ratio exceeds 84 dB across the full input

common-mode range. The INA823 has a wide

common-mode voltage range as low as 150-mV

below negative supply. The device is designed for

low-voltage operation from a 2.7-V single supply, and

dual supplies up to ±18 V. The low power and single

supply operation enable hand-held, battery-operated

systems.

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

INA823

SOIC (8)

4.90 mm × 3.91 mm

VSSOP (8)

3.00 mm x 3.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

+

–

+

–

+

–

50 k

50 k

50 k

50 k

50 k

50 k

Overvoltage

Protection

Overvoltage

Protection

RG

REF

+VS

OUT

VS

IN

+IN

RG

1

2

3

4

5

6

7

8

INA823 Simplified Internal Schematic

Typical Distribution of

Input Stage Offset Voltage Drift

INA823

SBOSA75A – JULY 2021 – REVISED JULY 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. ADVANCE INFORMATION for preproduction products; subject to change

without notice.