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INA350

ACTIVE

Low-power (100 µA) selectable-gain instrumentation amplifier available in 8-pin WSON (2 mm by 2 mm)

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Data sheet

INA350

ACTIVE
Data sheet Order now

Product details

Number of channels 1 Vs (max) (V) 5.5 Vs (min) (V) 1.8 Input offset (±) (max) (µV) 1200 Voltage gain (min) (V/V) 10 Voltage gain (max) (V/V) 50 Noise at 1 kHz (typ) (nV√Hz) 43 Features Cost Optimized, Shutdown CMRR (min) (dB) 85 Iq (typ) (mA) 0.1 Bandwidth at min gain (typ) (MHz) 0.1 Gain error (±) (max) (%) 0.6 Operating temperature range (°C) -40 to 125 Rating Catalog Type Selectable gain Output swing headroom (to negative supply) (typ) (V) 0.015 Output swing headroom (to positive supply) (typ) (V) 0.015 Input common mode headroom (to negative supply) (typ) (V) 0 Input common mode headroom (to positive supply) (typ) (V) 0 Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 4
Number of channels 1 Vs (max) (V) 5.5 Vs (min) (V) 1.8 Input offset (±) (max) (µV) 1200 Voltage gain (min) (V/V) 10 Voltage gain (max) (V/V) 50 Noise at 1 kHz (typ) (nV√Hz) 43 Features Cost Optimized, Shutdown CMRR (min) (dB) 85 Iq (typ) (mA) 0.1 Bandwidth at min gain (typ) (MHz) 0.1 Gain error (±) (max) (%) 0.6 Operating temperature range (°C) -40 to 125 Rating Catalog Type Selectable gain Output swing headroom (to negative supply) (typ) (V) 0.015 Output swing headroom (to positive supply) (typ) (V) 0.015 Input common mode headroom (to negative supply) (typ) (V) 0 Input common mode headroom (to positive supply) (typ) (V) 0 Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 4
X2QFN (RUG) 10 3 mm² (1.5 mm × 2 mm) WSON (DSG) 8 4 mm² (2 mm × 2 mm) SOT-23-THN (DDF) 8 8.12 mm² (2.9 mm × 2.8 mm)
  • 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
    • 10-pin X2QFN (RUG) – 3 mm 2
    • 8-pin WSON (DSG) – 4 mm 2
    • 8-pin SOT23-THN (DDF) – 4.64 mm 2
  • Optimized performance for 10-bit to 14-bit systems
    • CMRR: 95 dB (typical) across all gains
    • Offset voltage: 0.2 mV (typical) across all gains
    • Gain error (typical):
      • 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 (typical)
  • Drives 500 pF with less than 20% overshoot (typical)
  • Optimized quiescent current: 100 µA (typical)
  • 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
  • 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
    • 10-pin X2QFN (RUG) – 3 mm 2
    • 8-pin WSON (DSG) – 4 mm 2
    • 8-pin SOT23-THN (DDF) – 4.64 mm 2
  • Optimized performance for 10-bit to 14-bit systems
    • CMRR: 95 dB (typical) across all gains
    • Offset voltage: 0.2 mV (typical) across all gains
    • Gain error (typical):
      • 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 (typical)
  • Drives 500 pF with less than 20% overshoot (typical)
  • Optimized quiescent current: 100 µA (typical)
  • 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

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 bill of materials (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.

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 bill of materials (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.
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Technical documentation

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* Data sheet INA350 Cost and Size Optimized, Low Power, 1.8-V to 5.5-V Selectable Gain Instrumentation Amplifier datasheet (Rev. C) PDF | HTML May 10, 2023
Design guide Low-Cost Blood Pressure and Heart Rate Monitor Reference Design PDF | HTML Dec 19, 2023
Analog design Journal Comparing dual-supply discrete and integrated instrumentation amplifiers PDF | HTML Jun 29, 2023
Product overview Small-Size INA35x Versus Discrete Instrumentation Amps (Rev. A) PDF | HTML Jan 31, 2023
Product overview Bridge Sensor Solution (Rev. A) PDF | HTML Jan 27, 2023

Design & development

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Evaluation board

INA-DDF-EVM — Evaluation module for instrumentation amplifiers in DDF package

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The SMALL-AMP-DIP-EVM speeds up small-package operational-amplifier prototyping by providing a fast and easy way to interface with many industry-standard small-size packages. SMALL-AMP-DIP-EVM supports eight small package options including DPW-5 (X2SON), DSG-8 (WSON), DCN-8 (SOT), DDF-8 (...)

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Simulation model

Bridge Sensor Solution TINA-TI Reference Design

SBOMC56.ZIP (68 KB) - TINA-TI reference design
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INA350 G10 PSpice Model (Rev. C)

SBOMBZ2C.ZIP (47 KB) - PSpice model
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INA350 G10 TINA-TI Reference Design (Rev. C)

SBOMBY6C (65 KB) - TINA-TI reference design
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INA350 G10 TINA-TI Spice Model (Rev. B)

SBOMBY8B.ZIP (5 KB) - TINA-TI Spice model
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INA350 G20 PSpice Model (Rev. C)

SBOMBY9C.ZIP (20 KB) - PSpice model
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INA350 G20 TINA-TI Reference Design (Rev. C)

SBOMBZ1C (65 KB) - TINA-TI reference design
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INA350 G20 TINA-TI Spice Model (Rev. B)

SBOMBZ0B.ZIP (5 KB) - TINA-TI Spice model
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INA350 G30 PSpice Model (Rev. C)

SBOMBZ4C.ZIP (16 KB) - PSpice model
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INA350 G30 TINA-TI Reference Design (Rev. C)

SBOMBZ6C (65 KB) - TINA-TI reference design
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INA350 G30 TINA-TI Spice Model (Rev. B)

SBOMBZ5B.ZIP (5 KB) - TINA-TI Spice model
Supported products & hardware
Simulation model

INA350 G50 PSpice Model (Rev. D)

SBOMBZ8D.ZIP (16 KB) - PSpice model
Supported products & hardware
Simulation model

INA350 G50 TINA-TI Reference Design (Rev. C)

SBOMBZ9C (65 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

INA350 G50 TINA-TI Spice Model (Rev. B)

SBOMC00B.ZIP (5 KB) - TINA-TI Spice model
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Package Pins CAD symbols, footprints & 3D models
X2QFN (RUG) 10 Ultra Librarian
WSON (DSG) 8 Ultra Librarian
SOT-23-THN (DDF) 8 Ultra Librarian
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