ADM487E

Полудуплексный приемопередатчик RS-485/RS-422 (250 кбит/с, ¼ единичной нагрузки) с защитой от электростатического разряда ±15 кВ, питание 5 В
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ADM485E/ADM487E/ADM1487E – это малопотребляющие приемопередатчики с напряжением питания 5 В и защитой от электростатического разряда до ±15 кВ, которые подходят для полудуплексной связи в многоточечных шинах. Они предназначены для передачи данных по симметричным линиям и соответствуют требованиям стандартов TIA/EIA RS-485 и RS-422. Входной импеданс приемников ADM487E и ADM1487E равен 1/4 единичной нагрузки, что позволяет подключать к шине до 128 приемопередатчиков, в то время как импеданс ADM485E позволяет подключать к шине до 32 приемопередатчиков. Поскольку в любой отдельно взятый момент времени активным может быть только один драйвер, выход отключенного или находящегося в состоянии пониженного энергопотребления драйвера переводится в третье состояние во избежание перегрузки шины.

Скорость нарастания сигналов в драйвере ограничена для уменьшения электромагнитных помех и возможных ошибок передачи данных вследствие отражений от некорректно согласованных шин. Схема отключения при перегреве предотвращает чрезмерное рассеивание мощности, которое может возникать при конфликтах на шине или закорачивании по выходу. Компоненты работают в промышленном температурном диапазоне и выпускаются в 8-выводном корпусе SOIC.

Области применения

  • Измерение мощности/электроэнергии
  • Системы освещения
  • Промышленные системы управления
  • Телекоммуникации
  • Охранные системы
  • Измерительная техника

Статус продукта

checked 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

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EVAL-RS485HDEBZ Circuit Diagram

Product Details

The EVAL-RS485HDEBZ allows quick and easy evaluation of half-duplex RS-485 transceivers with standard 8-lead SOIC footprints. The evaluation board allows interfacing via screw terminal block to digital I/O for driver input (DI), receiver output (RO), driver enable (DE) and receiver output (RO). Bus signals A and B (half-duplex bus) can be connected to a bus screw terminal block. One or two termination resistors can be connected to A and B via jumper settings, in order to evaluation the half-duplex RS-485 driver and receiver. Footprints are provided for pull-up and pull-down (biasing resistors) on the bus.

Devices for evaluation on the board must be ordered separately.

Product Details

The ezLINX™ iCoupler® Isolated Interface Development Environment provides developers with a cost-effective, plug and play method for evaluation eight physical layer, digitally-isolated communication standards (USB, RS-422, RS-485, RS-232, CAN, SPI, I2C, and LVDS). The Blackfin® ADSP-BF548 processor is used to run the uCLinux operating system and allows for easy customization through the open source hardware and software platform. Development time is significantly reduced for embedded designers and system architects who are designing and evaluating isolated communication standards. The interfaces on ezLINX use ADI's isolated transceivers with integrated iCoupler® and isoPower® digital isolator technology.

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The ezLINX™ iCoupler® Isolated Interface Development Environment provides developers with a cost-effective, plug and play method for evaluation eight physical layer, digitally-The ezLINX™ iCoupler® Isolated Interface Development Environment provides developers with a cost-effective, plug and play method for evaluation eight physical layer, digitally-The ezLINX™ iCoupler® Isolated Interface Development Environment provides developers with a cost-effective, plug and play method for evaluation eight physical layer, digitally-The ezLINX™ iCoupler® Isolated Interface Development Environment provides developers with a cost-effective, plug and play method for evaluation eight physical layer, digitally-

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.

ADM487E 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.


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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.