Current sensing reference design for 10 µA to 10 mA, low side, single supply


Design files


This 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.

  • 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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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

SLAC575.ZIP (83 K)

Detailed schematic diagram for design layout and components

TIDR147.PDF (81 K)

Detailed schematic diagram for design layout and components

TIDR148.PDF (186 K)

Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

Instrumentation amplifiers

INA326Precision, Low Drift, CMOS Instrumentation Amplifier

Data sheet: PDF

Technical documentation

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Type Title Date
* User guide TIPD104 Design Reference Guide Sep. 19, 2013

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

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