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  3. 4-20mA
  4. 4-20mA Current Loop D/A Converters
  5. AD5421

Data Sheet Rev. I
PDF
JP Rev. A
User Guide
JP 1 View All
IBIS Model
1 View All
Circuit Note Rev. A
CN | JP 3 View All
Device Drivers
2 View All

Overview

Features and Benefits

  • 16-bit resolution and monotonicity
  • Pin selectable NAMUR-compliant ranges
    • 4 mA to 20 mA
    • 3.8 mA to 21 mA
    • 3.2 mA to 24 mA
  • NAMUR-compliant alarm currents
    • Downscale alarm current = 3.2 mA
    • Upscale alarm current = 22.8 mA/24 mA
  • Total unadjusted error (TUE): 0.05% maximum
  • INL error: 0.0035% FSR maximum
  • Output TC: 3 ppm/°C typical
  • Quiescent current: 300 μA maximum
  • Flexible SPI-compatible serial digital interface with Schmitt triggered inputs
  • On-chip fault alerts via FAULT pin or alarm current
  • Automatic readback of fault register on each write cycle
  • Slew rate control function
  • Gain and offset adjust registers
  • On-chip reference TC: 4 ppm/°C maximum
  • Selectable regulated voltage output
  • Loop voltage range: 5.5 V to 52 V
  • Temperature range: −40°C to +105°C
  • TSSOP and LFCSP packages

Product Details

The AD5421 is a complete, loop-powered, 4 mA to 20 mA digital-to-analog converter (DAC) designed to meet the needs of smart transmitter manufacturers in the industrial control industry. The DAC provides a high precision, fully integrated, low cost solution in compact TSSOP and LFCSP packages.

The AD5421 includes a regulated voltage output that is used to power itself and other devices in the transmitter. This regulator provides a regulated 1.8 V to 12 V output voltage. The AD5421 also contains 1.22 V and 2.5 V references, thus eliminating the need for a discrete regulator and voltage reference.

The AD5421 can be used with standard Highway Addressable Remote Transducer (HART®) FSK protocol communication circuitry without any degradation in specified performance. The high speed serial interface is capable of operating at 30 MHz and allows for simple connection to commonly used microprocessors and microcontrollers via a SPI-compatible, 3-wire interface.

The AD5421 is guaranteed monotonic to 16 bits. It provides 0.0015% integral nonlinearity, 0.0012% offset error, and 0.0006% gain error under typical conditions.

The AD5421 is available in a 28-lead TSSOP and a 32-lead LFCSP specified over the extended industrial temperature range of −40°C to +105°C.

Applications

  • Industrial Process Control
  • 4 mA to 20 mA loop-powered transmitters
  • Smart transmitters
  • HART network connectivity

Product Categories

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Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Documentation & Resources

  • View All (13)
  • Data Sheet (1)
  • Application Note (1)
  • User Guide (1)
  • Solutions Bulletin & Brochure (1)
  • Circuit Note (3)
  • Technical Article (5)
  • Video (1)
    • Document Type

    Software & Systems Requirements

    Device Drivers

    WIKI

    AD5421 - Microcontroller No-OS Driver
    WIKI

    AD5421 IIO DAC Linux Driver

    FPGA/HDL

    WIKI

    AD5421 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design
    WIKI

    BeMicro FPGA Project for AD5421 with Nios driver

    Tools & Simulations

    Precision DAC Error Budget Tool

    The Precision DAC Error Budget Tool is a web application that calculates the DC Accuracy of precision DAC signal chains. It shows how the static errors accumulate throughout your signal chain to quickly evaluate the design tradeoffs. Calculations include the DC errors introduced by Voltage References, Operation Amplifiers and Precision DACs.

    Precision DAC Error Budget Tool

    IBIS Model

    AD5421 IBIS Model

    Reference Designs (3)

    Product Recommendations

    AD5421 Companion Parts

    Recommended Digital Isolators

    Recommended Low Power Hart Modem

    Recommended Voltage References

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    AD5421ACPZ-REEL7 Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    AD5421BCPZ-REEL7 Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    AD5421BREZ Material Declaration Reliability Data 28-Lead TSSOP w/ EP
    AD5421BREZ-REEL Material Declaration Reliability Data 28-Lead TSSOP w/ EP
    AD5421BREZ-REEL7 Material Declaration Reliability Data 28-Lead TSSOP w/ EP
    AD5421CREZ Material Declaration Reliability Data 28-Lead TSSOP w/ EP
    AD5421CREZ-RL Material Declaration Reliability Data 28-Lead TSSOP w/ EP
    AD5421CREZ-RL7 Material Declaration Reliability Data 28-Lead TSSOP w/ EP
    Wafer Fabrication Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Select Model for PCN Information
    • AD5421ACPZ-REEL7 Production
    • AD5421BCPZ-REEL7 Production
    • AD5421BREZ Production
    • AD5421BREZ-REEL Production
    • AD5421BREZ-REEL7 Production
    • AD5421CREZ Production
    • AD5421CREZ-RL Production
    • AD5421CREZ-RL7 Production

    Support & Discussions

    AD5421 Discussions

    AD5421BREZ changed? (AD5421BREZS1)
    12 week(s) ago in Precision DACs
    RE: AD5422 SPI communication
    25 week(s) ago in Precision DACs
    CN0382 design files not accessible
    All AD5421 Discussions
    AD5421 Contact ADI Technical Support »
    AD5421 Ask your question »
    AD5421 Contact ADI Technical Support » AD5421 Ask your question »

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