Low Power HART Modem

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Design News Golden Mousetrap Award 2012

Product Details

The AD5700 is a single-chip solution, designed and specified to operate as a HART® FSK half-duplex modem, comply­ing with the HART physical layer requirements. The AD5700 integrates all of the necessary filtering, signal detection, modulating, demodulating and signal generation functions, thus requiring few external components. The maxi­mum supply current consumption of 115 µA and the small 4mm x 4mm housing, makes the AD5700 an optimal choice for low power loop-powered applica­tions. Transmit waveforms are phase continuous 1200 Hz and 2200 Hz sinusoids. The AD5700 contains accurate carrier detect circuitry and uses a standard UART interface.

  • Field transmitters
  • HART multiplexers
  • PLC and DCS analog I/O modules
  • HART network connectivity

Product Lifecycle

checked Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits


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Product Details

Both the AD5700 and the AD5700-1 products can be evaluated using the EVAL-AD5700-1EBZ Evaluation board. If evaluating the AD5700 product, simply disable the internal oscillator (i.e. configure the part to use either a CMOS clock or a crystal oscillator). No SDP board is required for this Evaluation board.

Tools & Simulations

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Reference Designs


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CN0382 Circuit Diagram

CN0382 Photo


CN0267 Circuit Diagram

CN0267 Photo


CN0270 Circuit Diagram

CN0270 Photo


CN0278 Circuit Diagram

Product Recommendations

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AD5700 Companion parts

Recommended Output DAC's

  • For 16-bit, loop powered, 4 mA to 20 mA DAC , we recommend the AD5421 .
  • For 16-bit, quad-channel, 4 mA to 20 mA and voltage output DAC , we recommend the AD5755-1 .
  • For 12-bit /16-bit, current source and voltage output DAC's , we recommend the AD5412 or the AD5422 .
  • For 12-bit /16-bit, line powered, 4 mA to 20 mA current source DAC's , we recommend the AD5410 or the AD5420 .

Reference Materials

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Design Resources

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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.

AD5700 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints



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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.

Price Table Help

Evaluation Boards Pricing displayed is based on 1-piece.
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.