Complete 4 mA to 20 mA HART Solution (CN0270)

The circuit shown in Figure 1 uses the AD5700, the industry’s lowest power and smallest footprint HART1-compliant IC modem and the AD5420, a 16-bit current-output DAC, to form a complete HART-compatible 4 mA to 20 mA solution.


For additional space savings, the AD5700-1 offers a 0.5% precision internal oscillator.



Figure 1. AD5420 HART-Enabled Circuit Simplified Schematic

This circuit adheres to the HART physical layer specifications as defined by the HART Communication Foundation, for example, the analog rate of change and noise during silence specifications.

For many years, 4 mA to 20 mA communication has been used in process control instrumentation. This communication method is reliable and robust, and offers high immunity to environmental interference over long communication distances. A limitation, however, is that only 1-way communication of one process variable at a time is possible.


The development of the highway addressable remote transducer (HART) standard provided highly capable 2-way digital communication, simultaneously with the 4 mA to 20 mA analog signaling used by traditional instrumentation equipment. This allows for features such as remote calibration, fault interrogation, and transmission of additional process variables. Put simply, HART is a digital two-way communication in which a 1 mA peak-to-peak frequency-shift-keyed (FSK) signal is modulated on top of the 4 mA to 20 mA analog current signal.

Возможности

  • Complete HART compliant solution
  • 4mA to 20mA
  • Lowest power in industry

Файлы

Complete 4 mA to 20 mA HART Solution  CN0270

Используемые компоненты

Производитель: Analog Devices Inc.
Наименование
Производитель
Описание Корпус/
Изображение
Цена, руб. Наличие
AD5420AREZ
AD5420AREZ
Analog Devices Inc.
Арт.: 603666 PDF RD
Доступно: 571 шт. от: 623 руб.
Digital to Analog Converters - DAC SGL CH 16B CURRENT SOURCE OUT IC
AD5420AREZ 623,00 от 6 шт. 534,00 от 12 шт. 490,00
475 шт.
(на складе)
96 шт.
(под заказ)
AD5420AREZ-REEL7
Analog Devices Inc.
Арт.: 1290788 PDF RD
Доступно: 3333 шт. от: 600 руб.
Digital to Analog Converters - DAC SGL CH 16B CURRENT SOURCE OUT IC
AD5420AREZ-REEL7 600,00 от 6 шт. 515,00 от 13 шт. 472,00
333 шт.
(на складе)
3000 шт.
(под заказ)
AD5420ACPZ-REEL7
AD5420ACPZ-REEL7
Analog Devices Inc.
Арт.: 1916049 PDF RD
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Digital to Analog Converters - DAC SGL CH 16B CURRENT SOURCE OUT IC
AD5420ACPZ-REEL7
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