ADM2687E 500 kbps, 5 kV rms Signal & Power Isolated RS-485 Transceiver with ±15 kV ESD Protection

Isolated RS-485/RS-422 interfaces Industrial field networks Multipoint data transmission systems

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.

Applications

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

Interface & Isolation

Isolated RS-485

Data Sheets

Document	note
ADM2682E/ADM2687E: 5 kV rms Signal and Power Isolated RS-485 Transceiver with ±15 kV ESD Protection Data Sheet (Rev. C)	PDF 1030 kB

Application Notes

Document	note
AN-1179: Junction Temperature Calculation for Analog Devices RS-485/RS-422, CAN, and LVDS/M-LVDS Transceivers (Rev. A)	PDF 156.87 K
AN-0971: Recommendations for Control of Radiated Emissions with isoPower Devices (Rev. C)	PDF 406 kB
AN-1176: Component Footprints and Symbols in the Binary .Bxl File Format (Rev. 0)	PDF 671 kB

User Guides

Document	note
UG-317: Evaluation Board for the ADM2682E/ADM2687E 5 kV rms Signal and Power Isolated RS-485 Transceivers with ±15 kV ESD Protection	PDF 562 kB

Frequently Asked Questions

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
ADM2687EBRIZ Production	16 ld SOIC (increased Creepage)	OTH 37	-40 to 85C	7.65	6.5	Y
ADM2687EBRIZ-RL7 Production	16 ld SOIC (increased Creepage)	REEL 400	-40 to 85C	7.65	6.5	Y