Low-level V-to-I converter reference design, 0-V to 5-V input and 0-µA to 5-µA output


Design files


This verified design is a micro-amp voltage-to-current (V-I) converter that delivers a precise low level current to a load. The design operates on a single 5V supply and uses a precision low drift op-amp, and instrumentation amplifier. Simple modification can change the range and accuracy of the V-I converter.

  • Translates Voltage to current: 0 to 5V, 0uA to 5uA
  • Error: 0.3% max uncalibrated, 0.01% max calibrated
  • Single-Supply Solution
  • Utilizes INA326 RRI/O Instrumentation Amplifier
This verified design includes:
  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Verification and Measured Performance
  • 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.

SLAC577A.ZIP (505 K)

Detailed schematic diagram for design layout and components

TIDR185.PDF (74 K)

Detailed schematic diagram for design layout and components

TIDR207A.PDF (185 K)

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

TIDC144.ZIP (161 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Instrumentation amplifiers

INA326Precision, Low Drift, CMOS Instrumentation Amplifier

Data sheet: PDF
Precision op amps (Vos<1mV)

OPA333Micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier

Data sheet: PDF | HTML

Start development


Support software

TIDC145 TIPD107 Simulation

Technical documentation

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Type Title Date
* User guide TIPD107 Verified Design Reference Guide Sep. 19, 2013

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

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