ADM2485BRWZ-RL7 - Isolated RS-485 Transceiver | Analog Devices
Référence : ADM2485BRWZ-RL7 ✓ Actif| Qté | Prix unitaire | 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 Présentation
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.
Alternatives de remplacement direct pour ADM2485BRWZ-RL7 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ADM2485BRWZ-RL7 (même facteur de forme et même empreinte) — différant par Data Rate, Type, Supply Voltage (Logic Side), Standards Compliance.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ADM2485BRWZ
✅ Remplacement direct✓ En stock
$9.12 / unité
Voir la fiche technique →ADM2483BRWZ-RL7
✅ Remplacement direct✓ En stock
$4.16 / unité
Voir la fiche technique →ADM2483BRWZ
✅ Remplacement direct✓ En stock
$3.8182 / unité
Voir la fiche technique →ISO3082DW
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ISO35DW
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ADM2485BRWZ-RL7 Spécifications
| Type | Isolated RS-485/RS-422 Transceiver |
| Number of Channels | 3 |
| Isolation Voltage | 2500 Vrms |
| Débit de données | 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 |
| Plage de température de fonctionnement | -40°C to +85°C |
| Boîtier | 16-SOIC (0.295", 7.50mm Width) |
| Type de montage | Surface Mount |
| Standards Compliance | ANSI/TIA/EIA RS-485-A-98, ISO 8482:1987(E) |
| Integrated Transformer Driver | Yes |
| Arrêt thermique | Yes |
| Statut RoHS | Compliant |
Configuration des broches de ADM2485BRWZ-RL7
| Broche 1 | VDD1 — Logic side supply voltage (5V) |
| Broche 2 | GND1 — Logic side ground |
| Broche 3 | TXD — Transmit data input |
| Broche 4 | RXD — Receive data output |
| Broche 5 | DE — Driver enable (active high) |
| Broche 6 | RE — Receiver enable (active low) |
| Broche 7 | NC — No connect |
| Broche 8 | NC — No connect |
| Broche 9 | VDD2 — Bus side supply voltage (5V) |
| Broche 10 | GND2 — Bus side ground |
| Broche 11 | A — Non-inverting bus line |
| Broche 12 | B — Inverting bus line |
| Broche 13 | GND2 — Bus side ground |
| Broche 14 | VISO — Isolated power output (from transformer) |
| Broche 15 | GNDISO — Isolated ground |
| Broche 16 | VDD1 — Logic side supply voltage (5V) |
Applications typiques
ADM2485BRWZ-RL7 convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ADM2485BRWZ-RL7 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- Integrated transformer driver (vs ISO3082DW)
- Higher data rate than ADM2483 (vs ADM2483BRWZ-RL7)
- Same package and pinout as ADM2483 (vs ADM2483BRWZ-RL7)
Notes de conception
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.
Informations de conformité
RoHS compliant per Analog Devices product page. No AEC-Q100 qualification indicated for this part.