Current Sensing Solution, 10uA-10mA, Low-side, Single Supply

(ACTIVE) TIPD104

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Technical Documents

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Key Document

Description

This TI Reference Design provides the theory, component selection, and simulation of a single-supply, precision low-side current sensing solution that can accurately detect load currents from 10uA-10mA. The corresponding linear output is from 100mV to 4.9V. While traditional op amps can be used for such an application, the INA326 instrumentation amplifier enables a differential measurement and minimizes errors due to PCB parasitic. The INA326 can be used in low-side current sensing because the unique internal circuit topology allows for linear rail-to-rail input and output operation. A unique yet simple gain switching network was implemented in order to realize the wide load current range.

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Features
  • Senses current from 10uA-10mA
  • Less than 0.1 % Error
  • Outputs 100mV to 4.9V
  • Single-Supply Solution
  • Low-Side Measurement
  • Unique gain-switching network
  • Utilizes INA326 RRI/O Instrumentation Amplifier
  •  

      This Reference Design Includes:

    • Theory
    • Component Selection
    • TINA-TI Simulation
    • Modification Options
  •  


View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.


  



Schematic/Block Diagram

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Test Data

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Bill of Materials (BOM)

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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA326  Precision, Low Drift, CMOS Instrumentation Amplifier  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA326 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 360 19 Sep 2013 3
Design files (2)
Title Abstract Type Size (KB) Date Views
PDF 186 06 Sep 2013 0
PDF 81 06 Sep 2013 1 1
Related Tools & Software

Development Tools (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Circuit Design & Simulation 

Software (1)



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