INA350 Cost and Size Optimized, Low Power, 1.8-V to 5.5-V Selectable Gain

Instrumentation Amplifier

1 Features

• Ideal for size, cost, and power conscious designs

• Selectable gain options

– G = 10 or G = 20 (INA350ABS)

– G = 30 or G = 50 (INA350CDS)

• Space saving ultra-small package options

• Optimized performance for 10-bit to 14-bit systems

– CMRR: 95 dB (typ) across all gains

– Offset voltage: 0.2 mV (typ) across all gains

– Gain error (typ):

• 0.05% for G = 10; 0.06% for G = 20

• 0.075% for G = 30; 0.082% for G = 50

• Bandwidth: 100 kHz for G = 10 (typ)

• Drives 500 pF with less than 20% overshoot (typ)

• Optimized quiescent current: 100 µA (typ)

• Shutdown option for power conscious applications

• Supply range: 1.8 V (±0.9 V) to 5.5 V (±2.75 V)

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

2 Applications

• Bridge network sensing

• Differential to single-ended conversion

• Weigh scale

• Analog input module

• Flow transmitter

• Wearable fitness and activity monitor

• Blood glucose monitor

• Pressure and temperature sensing

+

–

+

–

+

–

60 k

60 k

60 k

60 k

REF

V+

OUT

V

IN

+IN

90 k

/ 145 k

90 k

/ 145 k

GS

SHDN

_____

Note: 90 kΩ for INA350ABS and 145 kΩ for INA350CDS

Simplified Internal Schematic

3 Description

INA350 is a selectable-gain instrumentation amplifier

that offers four gain options across INA350ABS and

INA350CDS variants available in small packages.

INA350ABS has gain options of 10 or 20 and

INA350CDS has gain options of 30 or 50. These

gain options can be selected by toggling the gain

select (GS) pin. INA350 is ideal for bridge-type

sensing and for differential to single-ended conversion

applications.

Built with precision matched integrated resistors,

INA350 saves on BOM costs, pick-and-place machine

handling costs, and board space by removing

the need for precise or closely-matched external

resistors. The device interface directly to low-speed,

10-bit to 14-bit, analog-to-digital converters (ADC)

and is ideal for replacing discrete implementation

of instrumentation amplifiers built with commodity

amplifiers and discrete resistors.

Designed with the three-amplifier architecture, INA350

is optimized for delivering performance. It achieves

85 dB of minimum CMRR and 0.6% of maximum

gain error, along with 1.2 mV of maximum offset

across all gain options, while consuming just 125 µA

of maximum quiescent current. It has an integrated

shutdown option to turn off the amplifier when idle

for additional power savings in battery powered

applications.

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

INA350ABS,

INA350CDS

WSON (8)

2.00 mm × 2.00 mm

SOT-23 (8)

1.60 mm × 2.90 mm

X2QFN (10)(2)

1.50 mm × 2.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

(2)

This package is preview only.

INA350

SBOSAA0B – NOVEMBER 2021 – REVISED APRIL 2022

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.