ADM2485BRWZ-RL7 - Isolated RS-485 Transceiver | Analog Devices
N.º de pieza: ADM2485BRWZ-RL7 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.5 | $6,50 |
| 10 | $5.85 | $58,50 |
| 100 | $5.2 | $520,00 |
| 500 | $4.68 | $2.340,00 |
| 1.000 | $4.16 | $4.160,00 |
ADM2485BRWZ-RL7 Descripción general
A digital isolator is a component that provides electrical isolation between two circuits while allowing digital signals to pass. In the context of RS-485 communication, isolation protects against ground loops, common-mode voltage differences, and transient surges, ensuring reliable data transmission in harsh industrial environments. The ADM2485 uses Analog Devices' iCoupler technology, which uses chip-scale transformers instead of optocouplers, offering higher speed, lower power, and better reliability.
Key features include a 3-channel isolator (one driver, one receiver, one data direction control), an integrated transformer driver that provides isolated power with an external transformer, and compliance with ANSI/TIA/EIA RS-485-A-98 and ISO 8482:1987(E). The device operates from a single 5V supply on the logic side and a 5V supply on the bus side, with a common-mode voltage range of -7V to +12V. It features thermal shutdown protection and a wide operating temperature range of -40°C to +85°C.
The ADM2485 employs iCoupler technology, which uses chip-scale transformers to transmit data across an isolation barrier, providing superior performance compared to optocouplers. The integrated transformer driver generates a square wave that drives an external transformer to create an isolated power supply, eliminating the need for a separate DC-DC converter. This architecture reduces component count and board space while maintaining high isolation and data integrity.
Typical applications include industrial fieldbus networks, PROFIBUS, Modbus, motor control, and building automation systems. The device is ideal for applications requiring robust communication over long distances in electrically noisy environments. Its high CMTI (25 kV/µs) ensures reliable operation in the presence of fast transients.
When designing with the ADM2485, ensure proper PCB layout to maintain isolation creepage and clearance distances. Place the external transformer close to the device and use appropriate decoupling capacitors on both supply rails. The integrated transformer driver requires an external transformer with a 1:1 turns ratio and a center-tapped primary, as specified in the datasheet.
Alternativas directas para ADM2485BRWZ-RL7 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ADM2485BRWZ-RL7 (mismo factor de forma y huella) — difiere en Data Rate, Type, Supply Voltage (Logic Side), Standards Compliance.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ADM2485BRWZ
✅ Sustitución directa✓ En stock
$9.12 / unidad
Ver hoja de datos →ADM2483BRWZ-RL7
✅ Sustitución directa✓ En stock
$4.16 / unidad
Ver hoja de datos →ADM2483BRWZ
✅ Sustitución directa✓ En stock
$3.8182 / unidad
Ver hoja de datos →ISO3082DW
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ISO35DW
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ADM2485BRWZ-RL7 Especificaciones
| Type | Isolated RS-485/RS-422 Transceiver |
| Number of Channels | 3 |
| Isolation Voltage | 2500 Vrms |
| Velocidad de datos | 16 Mbps |
| CMTI | 25 kV/µs |
| Supply Voltage (Logic Side) | 5 V |
| Supply Voltage (Bus Side) | 5 V |
| Common-Mode Voltage Range | -7 V to +12 V |
| Rango de temperatura de funcionamiento | -40°C to +85°C |
| Encapsulado | 16-SOIC (0.295", 7.50mm Width) |
| Tipo de montaje | Surface Mount |
| Standards Compliance | ANSI/TIA/EIA RS-485-A-98, ISO 8482:1987(E) |
| Integrated Transformer Driver | Yes |
| Apagado térmico | Yes |
| Estado RoHS | Compliant |
Configuración de pines de ADM2485BRWZ-RL7
| Pin 1 | VDD1 — Logic side supply voltage (5V) |
| Pin 2 | GND1 — Logic side ground |
| Pin 3 | TXD — Transmit data input |
| Pin 4 | RXD — Receive data output |
| Pin 5 | DE — Driver enable (active high) |
| Pin 6 | RE — Receiver enable (active low) |
| Pin 7 | NC — No connect |
| Pin 8 | NC — No connect |
| Pin 9 | VDD2 — Bus side supply voltage (5V) |
| Pin 10 | GND2 — Bus side ground |
| Pin 11 | A — Non-inverting bus line |
| Pin 12 | B — Inverting bus line |
| Pin 13 | GND2 — Bus side ground |
| Pin 14 | VISO — Isolated power output (from transformer) |
| Pin 15 | GNDISO — Isolated ground |
| Pin 16 | VDD1 — Logic side supply voltage (5V) |
Aplicaciones típicas
ADM2485BRWZ-RL7 es adecuado para 6 aplicacións: Industrial Fieldbus Networks, Motor Control Systems, Building Automation, PROFIBUS Networks, Test and Measurement Equipment, Security and Surveillance Systems.
Industrial Fieldbus Networks
The ADM2485BRWZ-RL7 is ideal for industrial fieldbus networks such as PROFIBUS and Modbus, where high-speed, isolated RS-485 communication is required. Its 16 Mbps data rate and 2500 Vrms isolation ensure reliable data transfer in electrically noisy environments. The integrated transformer driver simplifies power supply design, reducing component count and board space. With a common-mode voltage range of -7V to +12V, it handles ground potential differences common in industrial settings. The device's high CMTI (25 kV/µs) ensures robust operation in the presence of fast transients, making it a dependable choice for factory automation and process control.
Recomendado
Motor Control Systems
In motor control systems, the ADM2485BRWZ-RL7 provides isolated communication between the controller and motor drives, preventing ground loops and protecting sensitive electronics from high-voltage transients. Its 16 Mbps data rate supports real-time control commands, while the 2500 Vrms isolation ensures safety in high-voltage environments. The integrated transformer driver allows for a compact isolated power supply, reducing overall system size. The device's wide operating temperature range (-40°C to +85°C) makes it suitable for industrial motor control cabinets. The high CMTI ensures reliable operation in the presence of switching noise from motor drives.
Recomendado
Building Automation
The ADM2485BRWZ-RL7 is well-suited for building automation systems, including HVAC controls, lighting systems, and access control. Its isolated RS-485 interface ensures reliable communication over long cable runs in commercial buildings, where ground potential differences are common. The 16 Mbps data rate supports fast polling of multiple devices, while the 2500 Vrms isolation protects against surges from lightning or power faults. The integrated transformer driver simplifies the design of isolated power supplies, reducing cost and board space. The device's compliance with RS-485 standards ensures interoperability with existing building automation protocols.
Recomendado
PROFIBUS Networks
The ADM2485BRWZ-RL7 is specifically designed for PROFIBUS networks, which require data rates up to 12 Mbps. Its 16 Mbps capability provides ample headroom, ensuring reliable communication even in demanding environments. The device's 2500 Vrms isolation protects against ground loops and common-mode noise, which are common in industrial PROFIBUS installations. The integrated transformer driver enables a compact isolated power supply, reducing overall system complexity. With a common-mode voltage range of -7V to +12V, it meets PROFIBUS requirements for bus voltage levels. The high CMTI ensures robust operation in the presence of electromagnetic interference.
Recomendado
Test and Measurement Equipment
In test and measurement equipment, the ADM2485BRWZ-RL7 provides isolated RS-485 communication between instruments and a host controller, ensuring accurate data acquisition in noisy environments. Its 16 Mbps data rate supports high-throughput data transfer, while the 2500 Vrms isolation protects sensitive measurement circuits from ground loops and transients. The integrated transformer driver simplifies the design of isolated power supplies, reducing noise coupling. The device's high CMTI ensures reliable operation in the presence of fast transients from switching power supplies. Its wide operating temperature range makes it suitable for benchtop and portable instruments.
Recomendado
Security and Surveillance Systems
The ADM2485BRWZ-RL7 is used in security and surveillance systems for isolated communication between cameras, sensors, and control panels. Its 16 Mbps data rate supports high-resolution video and control data transmission, while the 2500 Vrms isolation protects against surges from lightning or power faults. The integrated transformer driver enables a compact isolated power supply, reducing installation complexity. The device's wide common-mode voltage range ensures reliable operation in outdoor installations with significant ground potential differences. Its high CMTI ensures robust performance in the presence of electromagnetic interference from nearby equipment.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADM2485BRWZ-RL7 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADM2485BRWZ | ADM2483BRWZ-RL7 | ADM2483BRWZ | ISO3082DW | ISO35DW |
|---|---|---|---|---|---|---|
| Package | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) - same | 16-SOIC (0.295", 7.50mm Width) - same | 16-SOIC (0.295", 7.50mm Width) - same | 16-SOIC (0.295", 7.50mm Width) - same | 16-SOIC (0.295", 7.50mm Width) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Data Rate | 16 Mbps | 16 Mbps | 500 kbps | 500 kbps | 20 Mbps | 16 Mbps |
| Isolation Voltage | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms |
| Integrated Transformer Driver | Yes | Yes | Yes | Yes | No | No |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 50 kV/µs | 50 kV/µs |
| Supply Voltage (Logic Side) | 5 V | 5 V | 5 V | 5 V | 3.3 V or 5 V | 3.3 V or 5 V |
| Common-Mode Voltage Range | -7 V to +12 V | -7 V to +12 V | -7 V to +12 V | -7 V to +12 V | -7 V to +12 V | -7 V to +12 V |
Diferenciadores clave
- Integrated transformer driver (frente a ISO3082DW)
- Higher data rate than ADM2483 (frente a ADM2483BRWZ-RL7)
- Same package and pinout as ADM2483 (frente a ADM2483BRWZ-RL7)
Notas de diseño
For the ADM2485BRWZ-RL7, maintain proper creepage and clearance distances between the logic and bus sides to meet isolation requirements. The 16-SOIC package has a minimum creepage of 8 mm, which is suitable for 2500 Vrms isolation. Ensure the PCB layout provides adequate spacing between the primary and secondary side traces to prevent arcing.
The integrated transformer driver requires an external transformer with a 1:1 turns ratio and center-tapped primary. Use a transformer with a suitable isolation rating and low leakage inductance. Place the transformer close to the device to minimize parasitic capacitance and ensure stable isolated power generation.
Do not exceed the absolute maximum ratings for supply voltages (6V on VDD1 and VDD2). Ensure proper decoupling with 0.1 µF capacitors on both supply pins. The RE and DE pins must be properly biased to avoid bus contention. For high-speed operation, use termination resistors matching the cable impedance to prevent reflections.
Información de cumplimiento
RoHS compliant per Analog Devices product page. No AEC-Q100 qualification indicated for this part.