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INA351

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Tiny (1.5-mm × 2-mm) low-power (100 µA) instrumentation amplifier with integrated voltage reference

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Data sheet

INA351

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) 1300 Voltage gain (min) (V/V) 10 Voltage gain (max) (V/V) 50 Noise at 1 kHz (typ) (nV√Hz) 36 Features Cost Optimized, Low power, Shutdown, Small Size CMRR (min) (dB) 86 Iq (typ) (mA) 0.11 Bandwidth at min gain (typ) (MHz) 0.1 Operating temperature range (°C) -40 to 125 Rating Catalog 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) 3.2
Number of channels 1 Vs (max) (V) 5.5 Vs (min) (V) 1.8 Input offset (±) (max) (µV) 1300 Voltage gain (min) (V/V) 10 Voltage gain (max) (V/V) 50 Noise at 1 kHz (typ) (nV√Hz) 36 Features Cost Optimized, Low power, Shutdown, Small Size CMRR (min) (dB) 86 Iq (typ) (mA) 0.11 Bandwidth at min gain (typ) (MHz) 0.1 Operating temperature range (°C) -40 to 125 Rating Catalog 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) 3.2
WSON (DSG) 8 4 mm² 2 x 2
  • Designed for size, cost, and power conscious applications
  • Selectable gain options with integrated reference buffer
    • G = 10 or G = 20 (INA351ABS)
    • G = 30 or G = 50 (INA351CDS)
  • Space saving ultra-small package options
    • 10-pin X2QFN (RUG) – 3 mm2
    • 8-pin WSON (DSG) – 4 mm2
    • 8-pin SOT23-THN (DDF) – 4.64 mm2
  • 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):
      • 0.015% for G = 10, G = 50
      • 0.020% for G = 20, G = 30
  • Bandwidth: 100 kHz for G = 10 (typ)
  • Drives 500 pF with less than 20% overshoot (typ)
  • Optimized quiescent current: 110 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
  • Designed for size, cost, and power conscious applications
  • Selectable gain options with integrated reference buffer
    • G = 10 or G = 20 (INA351ABS)
    • G = 30 or G = 50 (INA351CDS)
  • Space saving ultra-small package options
    • 10-pin X2QFN (RUG) – 3 mm2
    • 8-pin WSON (DSG) – 4 mm2
    • 8-pin SOT23-THN (DDF) – 4.64 mm2
  • 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):
      • 0.015% for G = 10, G = 50
      • 0.020% for G = 20, G = 30
  • Bandwidth: 100 kHz for G = 10 (typ)
  • Drives 500 pF with less than 20% overshoot (typ)
  • Optimized quiescent current: 110 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

INA351 is a selectable-gain instrumentation amplifier with integrated reference buffer that offers four gain options across INA351ABS and INA351CDS variants available in small packages. INA351ABS has gain options of 10 or 20 and INA351CDS has gain options of 30 or 50. These gain options can be selected by toggling the gain select (GS) pin. INA351 is an excellent choice for bridge-type sensing and for differential to single-ended conversion applications.

Built with precision matched integrated resistors, INA351 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 INA351 can interface directly to low-speed, 10-bit to 14-bit, analog-to-digital converters (ADC) and is an excellent choice for replacing discrete implementation of instrumentation amplifiers built with commodity amplifiers and discrete resistors.

Designed with the three-amplifier architecture, INA351 is optimized for delivering performance. The device achieves 86 dB of minimum CMRR and an accurate 0.1% of maximum gain error, along with 1.3 mV of maximum offset across all gain options, while consuming just 135 µA of maximum quiescent current. INA351 has an integrated shutdown option to turn off the amplifier when idle for additional power savings in battery powered applications.

INA351 is a selectable-gain instrumentation amplifier with integrated reference buffer that offers four gain options across INA351ABS and INA351CDS variants available in small packages. INA351ABS has gain options of 10 or 20 and INA351CDS has gain options of 30 or 50. These gain options can be selected by toggling the gain select (GS) pin. INA351 is an excellent choice for bridge-type sensing and for differential to single-ended conversion applications.

Built with precision matched integrated resistors, INA351 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 INA351 can interface directly to low-speed, 10-bit to 14-bit, analog-to-digital converters (ADC) and is an excellent choice for replacing discrete implementation of instrumentation amplifiers built with commodity amplifiers and discrete resistors.

Designed with the three-amplifier architecture, INA351 is optimized for delivering performance. The device achieves 86 dB of minimum CMRR and an accurate 0.1% of maximum gain error, along with 1.3 mV of maximum offset across all gain options, while consuming just 135 µA of maximum quiescent current. INA351 has an integrated shutdown option to turn off the amplifier when idle for additional power savings in battery powered applications.
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* Data sheet INA351 - Cost and Size Optimized, Low Power, 1.8-V to 5.5-V Selectable Gain Instrumentation Amplifier with Integrated Reference Buffer datasheet (Rev. B) PDF | HTML 02 Feb 2023
More literature Small-Size INA35x Versus Discrete Instrumentation Amps (Rev. A) PDF | HTML 31 Jan 2023
More literature Bridge Sensor Solution (Rev. A) PDF | HTML 27 Jan 2023
EVM User's guide INA-DDF-EVM User's Guide (Rev. A) PDF | HTML 21 Dec 2022
Technical article What is an instrumentation amplifier? 09 Aug 2019
Technical article How to layout a PCB for an instrumentation amplifier 14 Oct 2016
Technical article Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) 25 Nov 2013

Design & development

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INA351_G20 TINA-TI Reference Design

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INA351_G20 TINA-TI Spice Model

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INA351_G30 PSpice Model

SBOMCC4.ZIP (59 KB) - PSpice Model
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INA351_G30 TINA-TI Reference Design

SBOMCC8.TSC (51 KB) - TINA-TI Reference Design
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INA351_G30 TINA-TI Spice Model

SBOMCC6.ZIP (5 KB) - TINA-TI Spice Model
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INA351_G50 PSpice Model

SBOMCC5.ZIP (47 KB) - PSpice Model
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Simulation model

INA351_G50 TINA-TI Reference Design

SBOMCC9.TSC (51 KB) - TINA-TI Reference Design
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