ADM2485BRWZ - Isolated RS-485 Transceiver | Analog Devices
MPN： ADM2485BRWZ ✓ 啟用中ADM2485BRWZ 概覽
A digital isolator is a component that provides galvanic isolation between two circuits while allowing digital signals to pass. It uses capacitive or magnetic coupling to transfer data across an isolation barrier, preventing ground loops and protecting sensitive electronics from high voltages. The ADM2485BRWZ uses Analog Devices' iCoupler technology, which combines high-speed CMOS and monolithic transformer technology to achieve reliable isolation. This places it in the category of interface ICs, specifically isolated RS-485 transceivers, which are essential in industrial automation, motor control, and building automation systems where noise immunity and safety are critical.
Key features of the ADM2485BRWZ include a 16 Mbps data rate, 2.5 kVrms isolation voltage, 25 kV/µs CMTI, and an integrated transformer driver that simplifies the design of the isolated DC-DC converter. The device also has thermal shutdown protection and a wide operating temperature range of -40°C to +85°C. The receiver has a 1/8 unit load, allowing up to 256 nodes on the bus. The driver maintains a high output current of ±60 mA, ensuring robust signal integrity over long cable runs.
The ADM2485BRWZ is designed for use in industrial networks, such as PROFIBUS, Modbus, and BACnet, where reliable data transmission over long distances is required. Its integrated transformer driver reduces external component count, saving board space and simplifying the power supply design. The device is available in a 16-pin SOIC-W package, which is suitable for surface-mount assembly and is RoHS compliant.
When designing with the ADM2485BRWZ, it is important to ensure proper PCB layout to maintain isolation integrity. The isolation barrier should be kept clear of copper traces, and the transformer driver should be connected to a suitable external transformer and rectifier circuit to generate the isolated bus-side supply. Additionally, termination resistors should be placed at both ends of the bus to minimize reflections and ensure signal integrity.
直接替換替代品，適用於 ADM2485BRWZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADM2485BRWZ （相同外形與佔位） — 差異在於 Isolation Voltage, Package, Data Rate, Standards Compliance, Number of Channels.
ADM2485BRWZ-REEL7
✅ 直接替換📋 參考替代品（不在目錄中）
ADM2486BRWZ
✅ 直接替換聯絡詢價
查看資料表 →ADM2483BRWZ
✅ 直接替換聯絡詢價
查看資料表 →ADM2483BRWZ-RL7
✅ 直接替換聯絡詢價
查看資料表 →ISO3082DW
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ISO35DW
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADM2485BRWZ 規格
| Type | Isolated RS-485/RS-422 Transceiver |
| Number of Channels | 3 |
| Isolation Voltage | 2500 Vrms |
| 資料速率 | 16 Mbps |
| CMTI | 25 kV/µs |
| Supply Voltage (Logic Side) | 5 V |
| Supply Voltage (Bus Side) | 5 V |
| Driver Output Current | ±60 mA |
| Receiver Unit Load | 1/8 |
| 工作溫度範圍 | -40°C to +85°C |
| 封裝 | 16-SOIC (0.295", 7.50mm Width) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Standards Compliance | ANSI/TIA/EIA RS-485-A-98, ISO 8482:1987 (E) |
| Integrated Transformer Driver | Yes |
ADM2485BRWZ 腳位配置
| 腳位 1 | VDD1 — Logic side supply voltage (5V) |
| 腳位 2 | GND1 — Logic side ground |
| 腳位 3 | TXD — Transmit data input |
| 腳位 4 | RXD — Receive data output |
| 腳位 5 | NC — No connect |
| 腳位 6 | NC — No connect |
| 腳位 7 | NC — No connect |
| 腳位 8 | GND1 — Logic side ground |
| 腳位 9 | VISO — Isolated supply output (from transformer driver) |
| 腳位 10 | GNDISO — Isolated ground |
| 腳位 11 | A — Non-inverting bus line |
| 腳位 12 | B — Inverting bus line |
| 腳位 13 | GND2 — Bus side ground |
| 腳位 14 | VDD2 — Bus side supply voltage (5V) |
| 腳位 15 | NC — No connect |
| 腳位 16 | NC — No connect |
典型應用
ADM2485BRWZ 適用於 6 應用s: Industrial Automation, Building Automation, Motor Control, Power Grid Monitoring, Transportation Systems, Medical Equipment.
Industrial Automation
The ADM2485BRWZ is ideal for industrial automation networks such as PROFIBUS and Modbus, where high-speed, reliable communication over long distances is required. Its 16 Mbps data rate and 25 kV/µs CMTI ensure robust performance in electrically noisy factory environments. The integrated transformer driver simplifies the design of isolated power supplies, reducing component count and board space. The device's 1/8 unit load allows up to 256 nodes on the bus, making it suitable for large-scale automation systems. Its wide operating temperature range of -40°C to +85°C ensures reliable operation in harsh industrial conditions.
推薦
Building Automation
In building automation systems, the ADM2485BRWZ provides isolated RS-485 communication for HVAC controllers, lighting systems, and access control panels. Its 2.5 kVrms isolation protects against ground potential differences between floors and equipment, ensuring safe and reliable data transmission. The high CMTI of 25 kV/µs prevents data corruption from transient voltages caused by switching loads. The integrated transformer driver simplifies the design of isolated power supplies, reducing overall system cost. The device's compliance with ANSI/TIA/EIA RS-485-A-98 ensures interoperability with standard building automation protocols like BACnet.
推薦
Motor Control
The ADM2485BRWZ is used in motor control systems to provide isolated communication between the controller and motor drives. Its high CMTI of 25 kV/µs ensures reliable operation in the presence of high-voltage switching transients from the motor. The 16 Mbps data rate supports real-time control commands, while the integrated transformer driver simplifies the isolated power supply design. The device's wide operating temperature range and robust ESD protection make it suitable for industrial motor control environments. The 1/8 unit load allows multiple drives to be connected on the same bus, enabling coordinated control.
推薦
Power Grid Monitoring
In power grid monitoring systems, the ADM2485BRWZ provides isolated RS-485 communication between remote sensors and central control units. Its 2.5 kVrms isolation protects against high-voltage transients and ground potential differences in substations. The high CMTI ensures reliable data transmission in the presence of electromagnetic interference from power lines. The integrated transformer driver simplifies the design of isolated power supplies, reducing system complexity. The device's wide operating temperature range and compliance with RS-485 standards make it suitable for outdoor and harsh environments.
推薦
Transportation Systems
The ADM2485BRWZ is used in transportation systems for communication between control units in trains, buses, and traffic management systems. Its 2.5 kVrms isolation protects against ground potential differences and electrical noise from traction systems. The 16 Mbps data rate supports real-time data exchange for safety-critical applications. The integrated transformer driver simplifies the design of isolated power supplies, reducing weight and space. The device's wide operating temperature range and robust construction make it suitable for vibration and temperature extremes in transportation environments.
推薦
Medical Equipment
In medical equipment, the ADM2485BRWZ provides isolated RS-485 communication between patient monitoring devices and central systems. Its 2.5 kVrms isolation ensures patient safety by preventing electrical shock from ground potential differences. The high CMTI of 25 kV/µs ensures reliable data transmission in the presence of electromagnetic interference from medical devices. The integrated transformer driver simplifies the design of isolated power supplies, reducing system size and cost. The device's wide operating temperature range and compliance with medical safety standards make it suitable for use in hospitals and clinics.
推薦
推薦產品摘要
工程參考資料，適用於 ADM2485BRWZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADM2485BRWZ-REEL7 | ADM2486BRWZ | ADM2483BRWZ | ISO3082DW |
|---|---|---|---|---|---|
| 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 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Data Rate | 16 Mbps | 16 Mbps | 20 Mbps | 500 kbps | 20 Mbps |
| Isolation Voltage | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 50 kV/µs |
| Integrated Transformer Driver | Yes | Yes | Yes | No | No |
| Receiver Unit Load | 1/8 | 1/8 | 1/8 | 1/8 | 1/8 |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
主要差異化特點
- Integrated transformer driver (對比ADM2483BRWZ)
- Higher data rate (對比ADM2483BRWZ)
- Higher CMTI (對比ISO3082DW)
設計說明
Maintain a clear isolation barrier on the PCB. Do not route copper traces or planes under the isolation barrier, as this can reduce the isolation voltage rating. Keep the logic-side and bus-side grounds separated and connect them only through the isolation barrier. Use a solid ground plane on each side to minimize noise.
The integrated transformer driver requires an external transformer and rectifier circuit to generate the isolated bus-side supply. Select a transformer with appropriate turns ratio and isolation rating. Use a full-wave rectifier and smoothing capacitor to provide a stable 5V supply to VDD2. Ensure the transformer driver can handle the required load current.
For high-speed RS-485 communication at 16 Mbps, proper termination is essential. Place a 120-ohm termination resistor at both ends of the bus to match the characteristic impedance of the cable. Use twisted-pair cabling to minimize electromagnetic interference. Keep the stub lengths short to reduce reflections.
合規資訊
RoHS compliant per distributor listings. Other compliance information not specified in the provided data.