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Analog Devices Inc. ADM2487EBRWZ
- Part No.:
- ADM2487EBRWZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADM2487EBRWZ.pdf
- Description:
- DGT ISO 2.5KV RS422/RS485 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:235
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Product details
Overview
ADM2487EBRWZ from Analog Devices is a 2.5 kV isolated RS-485 transceiver with integrated transformer driver, ±15 kV ESD protection on bus pins, 500 kbps data rate, and true fail-safe receiver inputs. It operates with 5 V or 3.3 V logic-side supply (VDD1), isolated 3.3 V bus-side supply (VDD2), and supports half-duplex communication in industrial field networks.
For engineers reviewing the ADM2487EBRWZ datasheet, ADM2487EBRWZ pinout, ADM2487EBRWZ application, or ADM2487EBRWZ equivalent, key selection considerations include isolation voltage (2500 V rms), common-mode transient immunity (25 kV/µs), thermal shutdown protection, wide-body SOIC-16 package, and compatibility with external center-tapped transformers for isolated power generation.
Technical Context
The ADM2487EBRWZ integrates iCoupler® digital isolation with a three-channel isolator, differential line driver, and differential receiver - all powered across an isolation barrier via an on-chip oscillator driving external transformer windings (D1/D2 pins). Its logic side (GND1/VDD1) and bus side (GND2/VDD2) are galvanically separated with reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17).
It implements active-high driver enable (DE) and active-low receiver enable (RE), with tristate control of Y/Z outputs and RxD output. The receiver features a guaranteed negative input threshold (−200 mV to −30 mV), eliminating external bias resistors during bus idle conditions, and supports up to 256 nodes on a single RS-485 bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 500 kbps - supports reliable half-duplex industrial serial communication without signal integrity degradation at typical cable lengths. |
| Isolation Voltage | 2500 V rms (1 min) - meets UL 1577 and enables safe operation in high-noise, ground-potential-differing systems like motor drives and PLC backplanes. |
| ESD Protection | ±15 kV HBM on A/B/Y/Z pins - eliminates need for external TVS diodes in harsh industrial environments with frequent electrostatic discharge events. |
| Common-Mode Transient Immunity | 25 kV/µs - maintains data integrity during fast-switching noise events (e.g., relay switching, IGBT commutation) without bit errors. |
| Receiver Input Threshold | −200 mV to −30 mV - ensures RxD remains high during open/shorted bus conditions, enabling robust fail-safe behavior without external biasing. |
| Oscillator Frequency | 400–600 kHz (VDD1 = 5 V) - generates precise square-wave drive for external center-tapped transformer to derive isolated 3.3 V bus supply. |
| Supply Voltages | VDD1 = 3.3 V or 5 V; VDD2 = 3.3 V (isolated) - allows direct integration with MCU logic rails and eliminates need for separate isolated DC/DC converter. |
Pinout & Package
ADM2487EBRWZ uses a wide-body 16-lead SOIC package (SOIC_W) with creepage/clearance ≥7.8 mm and reinforced insulation per VDE 0884-17. Pin 10 is NC and must remain unconnected; dual GND2 pins (9 and 15) improve bus-side grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1 / D2 | Transformer driver outputs | Drive external center-tapped transformer primary to generate isolated 3.3 V bus supply; require no external gate drivers or switching controllers. |
| GND1 / VDD1 | Logic-side ground and supply | Reference for TxD, RxD, DE, RE signals; accepts 3.3 V or 5 V with internal regulation - simplifies host MCU interface. |
| RxD / TxD | Isolated receiver output / transmitter input | Logic-level CMOS outputs/inputs referenced to GND1; RxD is tristated when RE = high, enabling bus arbitration in multi-node systems. |
| DE / RE | Driver and receiver enable controls | Active-high DE enables Y/Z outputs; active-low RE enables RxD - supports hardware flow control and half-duplex direction management. |
| Y / Z | Differential driver outputs | Deliver RS-485-compliant differential voltage (≥1.5 V into 54 Ω); internally current-limited and thermally protected against short-circuit faults. |
| A / B | Differential receiver inputs | Accept RS-485 bus signals with true fail-safe threshold; high-impedance (96 kΩ) input reduces loading on long stubs and multi-drop buses. |
| GND2 / VDD2 | Bus-side ground and isolated supply | VDD2 is powered solely by external transformer/LDO circuit; GND2 must be physically separated from GND1 to maintain isolation integrity. |
Key Features
| Feature | Design Value |
|---|---|
| iCoupler® magnetic isolation | Replaces optocouplers with chip-scale transformers - delivers 2500 V rms isolation, >10⁹ Ω input-to-output resistance, and <3 pF capacitance for superior noise rejection. |
| Integrated transformer driver | Eliminates need for external oscillator or MOSFET gate drivers - reduces BOM count and PCB area while enabling compact isolated power architecture. |
| True fail-safe receiver | Guaranteed high RxD output when A–B = 0 V (open/shorted bus) - removes requirement for external pull-up/pull-down resistors and improves system reliability. |
| Thermal shutdown protection | Disables driver outputs at 150°C die temperature and re-enables at 140°C - prevents latch-up or permanent damage during sustained bus contention or short circuits. |
| 256-node bus support | Low unit load (1/8 UL) enables connection of up to 256 transceivers on one RS-485 segment - ideal for large-scale distributed I/O and sensor networks. |
Applications
| Industrial PLC Backplane | Motor Drive Communication Interface |
|---|---|
|
Use Scenario: RS-485 link between PLC CPU module and remote I/O expansion modules mounted on noisy metal chassis with varying ground potentials. IC Role / Device Role: Isolated transceiver bridging logic-side controller and bus-side field devices, providing galvanic separation between 24 V DC control logic and 48 V motor power domains. Use Value: Prevents ground loop currents from corrupting Modbus RTU frames and eliminates need for external isolated DC/DC converters or optocoupled level shifters. |
Use Scenario: Bidirectional parameter upload/download and status reporting between servo drive and motion controller in CNC machinery with high dv/dt noise from IGBT switching. IC Role / Device Role: Half-duplex RS-485 transceiver with 25 kV/µs CMTI, placed directly at drive terminal block to minimize stub length and maximize noise immunity. Use Value: Maintains error-free communication during rapid bus voltage transients (e.g., 1 kV common-mode slew), avoiding spurious fault resets or command loss. |
| Building Automation BACnet MS/TP Network | Energy Metering Data Concentrator |
|
Use Scenario: Interconnecting HVAC controllers, thermostats, and damper actuators over daisy-chained RS-485 wiring spanning multiple floors with shared neutral but independent grounds. IC Role / Device Role: Fail-safe isolated node transceiver supporting BACnet MS/TP physical layer, configured for half-duplex operation with automatic direction control. Use Value: Ensures deterministic bus arbitration and guaranteed idle-state logic high on RxD - critical for collision detection and token-passing protocol stability. |
Use Scenario: Aggregating pulse-count and Modbus data from 32+ utility meters installed in electric substation cabinets with high EMI and lightning-induced surges. IC Role / Device Role: Robust RS-485 interface with ±15 kV HBM ESD rating and reinforced insulation, mounted on concentrator PCB adjacent to meter input terminals. Use Value: Survives repeated 15 kV contact discharges without degradation, reducing field return rates and eliminating need for external surge protection components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated RS-485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO3082DWR | Lower isolation rating (2500 V rms same), but only 10 Mbps max data rate; no integrated transformer driver - requires external isolated DC/DC or charge pump. | Best suited for cost-sensitive, lower-speed point-to-point links where isolated power is already available. | Select ISO3082DWR only if isolated bus supply exists and 500 kbps suffices; ADM2487EBRWZ preferred when transformer-based isolated power simplification is needed. |
| MAX1480BEPI+ | Higher data rate (16 Mbps), but older silicon process; lacks VDE 0884-17 certification and has lower CMTI (15 kV/µs vs. 25 kV/µs). | Suitable for legacy designs requiring higher speed but less stringent safety compliance or noise immunity. | Choose MAX1480BEPI+ only for drop-in replacement in existing 16 Mbps systems; ADM2487EBRWZ offers superior regulatory alignment and transient robustness for new industrial designs. |
Compared with ISO3082DWR and MAX1480BEPI+, the ADM2487EBRWZ uniquely combines integrated transformer driver functionality, VDE 0884-17 reinforced insulation, and 25 kV/µs CMTI - making it optimal for new designs requiring simplified isolated power architecture and highest immunity in electrically hostile environments.
Availability
ADM2487EBRWZ is available at Aetrix Electronics and suitable for industrial PLC backplanes, motor drive interfaces, building automation networks, and energy metering concentrators requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADM2487EBRWZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADM2487EBRWZ belongs to Analog Devices' iCoupler® isolated interface product line, designed specifically for robust, low-component-count galvanic isolation in RS-485/RS-422 field networks operating under high EMI, ground potential differences, and safety-critical conditions.
FAQ
What is the maximum data rate supported by the ADM2487EBRWZ?
The ADM2487EBRWZ supports a maximum data rate of 500 kbps in half-duplex mode. This is confirmed in the datasheet's Timing Specifications table (Table 3), where propagation delay and rise/fall time parameters are specified for 500 kbps operation. While the ADM2482E variant supports 16 Mbps, the ADM2487EBRWZ is optimized for lower-speed, higher-noise industrial applications where timing margin and robustness are prioritized over raw speed.
Does the ADM2487EBRWZ require external isolated power, or does it generate its own bus-side supply?
The ADM2487EBRWZ does not include an internal isolated DC/DC converter but integrates an on-chip oscillator and transformer driver (pins D1/D2) that - when paired with an external center-tapped transformer, rectifier diodes, and LDO - generates the required isolated 3.3 V bus-side supply (VDD2). This architecture eliminates the need for a discrete isolated DC/DC module while maintaining full galvanic separation, as documented in the "Isolated Power Supply Circuit" section of the datasheet.
How does the true fail-safe receiver in the ADM2487EBRWZ improve system reliability?
The ADM2487EBRWZ's true fail-safe receiver guarantees RxD = high when the A–B differential voltage is near 0 V (e.g., during bus idle, open circuit, or short circuit). Its input threshold is specified from −200 mV to −30 mV - strictly negative - ensuring deterministic logic state without external bias resistors. This prevents undefined receiver output states that could cause UART framing errors or false interrupts in microcontroller hosts, directly improving uptime in unpowered or disconnected network segments.
What safety certifications apply to the ADM2487EBRWZ, and what do they mean for system design?
The ADM2487EBRWZ carries UL 1577 (2500 V rms, 1 minute) and DIN EN IEC 60747-17 (VDE 0884-17) certifications, with VIORM = 560 V peak and reinforced insulation classification. These approvals validate its suitability for functional isolation in safety-critical industrial equipment, allowing designers to meet IEC 61000-4-x immunity requirements and simplify end-equipment certification by eliminating need for additional isolation barriers in the signal path.
Can the ADM2487EBRWZ operate with a 3.3 V logic supply, and how does that affect the oscillator frequency?
Yes, the ADM2487EBRWZ supports VDD1 = 3.3 V operation, and this directly impacts oscillator frequency: at 3.3 V, fOSC ranges from 230 kHz to 430 kHz (vs. 400–600 kHz at 5 V), as specified in Table 1. This lower frequency reduces transformer core losses and EMI generation in space-constrained layouts, while still delivering sufficient power to sustain the isolated 3.3 V bus supply under full load - verified in Figure 4 of the datasheet.
ADM2487EBRWZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCoupler®
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- RS422, RS485
- Isolated Power:
- No
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 2/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 500kbps
- Propagation Delay tpLH / tpHL (Max):
- -
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 1.1µs, 1.1µs (Max)
- Voltage - Supply:
- 3.3V, 5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADM2487EBRWZ FAQ
1.How can I place an order for ADM2487EBRWZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM2487EBRWZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADM2487EBRWZ reliable?
The price and inventory of ADM2487EBRWZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM2487EBRWZ is usually 5 days.
3.What payment methods are accepted for ADM2487EBRWZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM2487EBRWZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM2487EBRWZ?
ADM2487EBRWZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM2487EBRWZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADM2487EBRWZ?
For technical support, including ADM2487EBRWZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM2487EBRWZ requirements.
6.How does Aetrix verify that ADM2487EBRWZ is sourced from the original manufacturer or authorized distributors?
All ADM2487EBRWZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADM2487EBRWZ meets industry standards.
7.What is the process for return or replacement of ADM2487EBRWZ?
All ADM2487EBRWZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM2487EBRWZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADM2487EBRWZ part is unused and in its original packaging.
Return procedure for ADM2487EBRWZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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