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AD5421:  16-Bit, Serial Input, Loop-Powered, 4mA to 20mA DAC

Product Details

Product Status:Recommended for New Designs

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 a compact TSSOP package 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 HART® FSK protocol communication circuitry without any degradation in specified performance. The high speed serial interface is capable of opera-ting 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
  • 4mA to 20mA loop-powered transmitters
  • Smart transmitters
  • HART network connectivity

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 =
    22.8mA/24mA
  • Total unadjusted error (TUE): 0.05% maximum
  • INL error: 0.0035% FSR maximum
  • Output TC: 3 ppm/°C typical
  • Quiescent current: 300 μA maximum
  • See datasheet for additional features

Functional Block Diagram for AD5421

Similar Products

  • AD5422 Single Channel, 16-Bit, Serial Input, Current Source & Voltage Output DAC
  • AD5420 Single-Channel, 16-Bit, 4 mA to 20 mA, Current Source DAC

Video: AD5421: 16-bit 4mA to 20mA Loop Powered DAC

Demo circuit for 4- 20-mA HART Enabled Field Instruments

Additional Evaluation Board Information

If you purchase the evaluation board model of this product, you will also need the System Demonstration Platform (SDP). They are used in conjunction as part of a customer evaluation environment.

Documentation

Title Content Type File Type
AD5421: 16-Bit, Serial Input, Loop-Powered, 4 mA to 20 mA DAC Data Sheet (Rev G, 10/2013) (pdf, 3039 kB) Data Sheets PDF
Complete 4 mA to 20 mA Loop Powered Field Instrument with HART Interface  (pdf, 259 kB) Circuit Note PDF
CN0278: Complete 4 mA to 20 mA HART Solution with Additional Voltage Output Capability  (pdf, 442 kB) Circuit Note PDF
AD5421: 16-bit 4mA to 20mA DAC
The AD5421 is a loop powered 16-bit 4mA to 20mA digital to analog converter (DAC) and features integrated precision converters and smart power management circuitry. The AD5421 is the industry's lowest power 4mA to 20mA DAC.
Videos HTML
UG-250: Evaluation Board for 16-Bit, Serial Input, Loop-Powered 4 mA to 20 mA DAC  (pdf, 540 kB) User Guides PDF
Signal Chain Solution for 4-mA to 20-mA HART Enabled Field Instrument Applications (26 Mar 2013) Press Releases HTML
Analog Devices’ Analog Microcontroller with ARM Cortex M3 and Dual 24-Bit Sigma-delta A/D Converters Offers Highest Accuracy, Lowest Power (04 Jun 2012) Press Releases HTML
Digital to Analog Converters ICs Solutions Bulletin  (pdf) Solutions Bulletins PDF
Peak High-speed Performance even at low power. It's why more engineers choose ADI Data Converters. Solutions Bulletins HTML
Industrial ICs
Industrial ICs Solutions Bulletin, Volume 10, Issue 8
Solutions Bulletins HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD5421 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design FPGA HDL HTML
BeMicro FPGA Project for AD5421 with Nios driver FPGA HDL HTML
AD5421 - Microcontroller No-OS Driver Device Drivers HTML
AD5421 IIO DAC Linux Driver Device Drivers HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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.

Product Recommendations & Reference Designs

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Companion Products

Suggested Companion Products


Recommended Low Power Hart Modem for the AD5421

  • For a Hart-compliant fully integrated FSK modem, we recommend the AD5700 or the AD5700-1.
Recommended Digital Isolators for the AD5421
  • For isolated USB designs in healthcare and industrial control, we recommend the ADuM4160.
Recommended Voltage References for the AD5421 Recommended Power Solutions

  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD5421 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD5421ACPZ-REEL7 Status: Production 32 ld LFCSP (5x5mm) w/3.5mm exposed pad 32 Ind Reel, 1500 - $4.85 Y  Material Info PCN Purchase
AD5421BCPZ-REEL7 Status: Production 32 ld LFCSP (5x5mm) w/3.5mm exposed pad 32 Ind Reel, 1500 - $6.50 Y  Material Info PCN Purchase Sample
AD5421BREZ Status: Production 28 ld TSSOP-EP(EP=3x5.5mm) 28 Ind Tube, 50 $6.55 $5.55 Y  Material Info PCN Purchase Sample
AD5421BREZ-REEL Status: Production 28 ld TSSOP-EP(EP=3x5.5mm) 28 Ind Reel, 2500 - $5.55 Y  Material Info PCN Purchase
AD5421BREZ-REEL7 Status: Production 28 ld TSSOP-EP(EP=3x5.5mm) 28 Ind Reel, 1000 - $5.55 Y  Material Info PCN Purchase
AD5421CREZ Status: Production 28 ld TSSOP-EP(EP=3x5.5mm) 28 Ind Tube, 50 $8.79 $6.60 Y  Material Info PCN Purchase Sample
AD5421CREZ-RL Status: Production 28 ld TSSOP-EP(EP=3x5.5mm) 28 Ind Reel, 2500 - $6.60 Y  Material Info PCN Purchase
AD5421CREZ-RL7 Status: Production 28 ld TSSOP-EP(EP=3x5.5mm) 28 Ind Reel, 1000 - $6.60 Y  Material Info PCN Purchase Sample
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.

AD5421 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD5421SDZ Status: Production Evaluation Board $59.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Board $99.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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