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Features and Benefits
- 5 kV rms isolated RS-485/RS-422 transceiver, configurable as half or full duplex
- isoPower® integrated isolated dc-to-dc converter
- ±15 kV ESD protection on RS-485 input/output pins
- Complies with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E)
- Data rate: 500 kbps
- 5 V or 3.3 V operation
- Connect up to 256 nodes on one bus
- Open- and short-circuit, fail-safe receiver inputs
- High common-mode transient immunity: >25 kV/μs
- See data sheet for additional features
The ADM2682E/ADM2687E are fully integrated 5 kV rms signal and power isolated data transceivers with ±15 kV ESD protection and are suitable for high speed communication on multipoint transmission lines. The ADM2682E / ADM2687E include an integrated 5 kV rms isolated dc-to-dc power supply that eliminates the need for an external dc-to-dc isolation block.
They are designed for balanced transmission lines and comply with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E).
The devices integrate Analog Devices, Inc., iCoupler® technology to combine a 3-channel isolator, a three-state differential line driver, a differential input receiver, and Analog Devices isoPower® dc-to-dc converter into a single package. The devices are powered by a single 5 V or 3.3 V supply, realizing a fully integrated signal and power isolated RS-485 solution.
The ADM2682E/ADM2687E drivers have an active high enable. An active low receiver enable is also provided, which causes the receiver output to enter a high impedance state when disabled.
The devices have current limiting and thermal shutdown features to protect against output short circuits and situations where bus contention may cause excessive power dissipation. The parts are fully specified over the industrial temperature range and are available in a highly integrated, 16-lead, wide- body SOIC package with >8 mm creepage and clearance.
The ADM2682E/ADM2687E contain isoPower technology that uses high frequency switching elements to transfer power through the transformer. Special care must be taken during printed circuit board (PCB) layout to meet emissions standards. Refer to AN-0971 Application Note, Recommendations for Control of Radiated Emissions with isoPower Devices, for details on board layout considerations.
- Isolated RS-485/RS-422 interfaces
- Industrial field networks
- Multipoint data transmission systems
Product Lifecycle 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)
The ADM2687E evaluation board can be used for easy evaluation of the ADM2682E and ADM2687E power and signal isolated RS-485 transceivers. Screw terminal blocks provide convenient connections for the power and signal connections. The evaluation board is easily configured through jumper connections. The board can be used in half-duplex or fullduplex configurations and has a 120 Ω termination resistor fitted on the receiver input. The evaluation board can be used with either the ADM2682E 16 Mbps part or the ADM2687E 500 kbps part. The driver and receiver are enabled and disabled by jumper connections. Test points are included on the power and signal lines on both sides of the isolation barrier.
Features & Benefits
- 5 kV rms power and signal isolated RS-485/RS-422 transceiver
- Convenient connections for power and signal through screw terminal blocks
- Configurable as half duplex or full duplex
- 5 V or 3.3 V operation
- Easily configurable through jumper connections
- Test points for measuring all signals
- Layout optimized for emissions
Application Notes (3)
Tools & Simulations
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Product Selector Card (1)
Safety and Regulatory Compliance (1)
Product Selection Guide (1)
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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.
Sample & Buy
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.