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Current Sensing Solution, 10uA-10mA, Low-side, Single Supply
TIPD104
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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

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Schematic/Block Diagram

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Test Data

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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 documentation

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User guide (1)
Title Type Size (KB) Date
PDF 360 19 Sep 2013
Design files (3)
Title Type Size (KB) Date
ZIP 83 19 Sep 2013
PDF 186 06 Sep 2013
PDF 81 06 Sep 2013
Related Tools & Software

Design tools & simulation (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Simulation tool 

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