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CIRCUIT060043

Low-level voltage-to-current converter circuit

CIRCUIT060043

Overview

This circuit delivers a precise low-level current, IL, to a load, RL. The design operates on a single 5-V supply and uses one precision low-drift op amp and one instrumentation amplifier. Simple modifications can change the range and accuracy of the voltage-to-current (V-I) converter.
Features
  • Input: 0.49 V to 4.9 V
  • Output: 1 µA to 10 µA
  • Supply:
    • Vcc = 5 V/li>
    • Vee = 0 V
  • Load resistance: 0 Ω to 390 Ω
Precision op amps (Vos<1mV)
OPA333 — Micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier
Instrumentation amplifiers
INA326 — Precision, Low Drift, CMOS Instrumentation Amplifier
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Technical documentation

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Type Title Date
* Application note Low-level voltage-to-current converter circuit (Rev. A) PDF | HTML 10 Oct 2024
Application note How to Design a Simple Constant Current/Constant Voltage Buck Converter 26 Jun 2018

Related design resources

Design tools & simulation

SIMULATION TOOL
PSPICE-FOR-TI — PSpice® for TI design and simulation tool TINA-TI — SPICE-based analog simulation program
CALCULATION TOOL
ANALOG-ENGINEER-CALC — Analog engineer's calculator

Reference designs

REFERENCE DESIGN
TIPD107 — Low-level V-to-I converter reference design, 0-V to 5-V input and 0-µA to 5-µA output

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