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1B21:  Isolated, Loop-Powered Voltage-to-Current Converter

Product Details

The 1B21 is an isolated voltage-to-current converter that incorporates a unique circuit design utilizing transformer based isolation and automated surface mount manufacturing technology. It provides an unbeatable combination of versatility and performance in a compact plastic package. Designed for individual applications, it is especially suited for harsh environments with extremely high common-mode interference.

  • Multichannel Process Control
  • D/A Converter - Current Loop Interface
  • Analog Transmitters and Controllers
  • Remote Data Acquisition System

    • Wide Input Range: 0-1V to 0-10V
    • High CMV Isolation: 1500V rms
    • Programmable Output Ranges: 4mA to 20mA 0 to 20mA
    • Load Resistance Range: 0 to 1.35kΩ max
    • High Accuracy
      Low Offset Tempco: ±300nA/°C
      Low Gain Tempco: ±50ppm/°C
      Low Nonlinearity: ±0.02%
      High CMR: 90dB min
    • Small Package: 0.7"x2.1"x0.35"
    • Meets IEEE std. 472: Transient Protection (SWC)

    Functional Block Diagram for 1B21


    Title Content Type File Type
    1B21: Isolated, Loop-Powered Voltage-to-Current Converter Scanned Data Sheet  (Rev B, 10/2006) (pdf, 226 kB) Data Sheets PDF
    IOS Custom Product Worksheet
    As a Design Subcontractor, IOS believes it essential to engage with our customers early in the development cycle. Complete the form and it will be reviewed and you will be contacted by one of our design specialists.
    Custom Product Worksheet HTML
    IOS 3 Year Warranty  (pdf, 23 kB) Overview PDF
    IOS Short Form Brochure  (pdf, 2298 kB) Overview PDF
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Evaluation Kits & Symbols & Footprints

    Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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    Price, packaging, availability

    1B21 Model Options
    Price Table Help

    The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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