Analog Devices Inc. Analog Devices ADM3485E低功耗数据收发器
Analog Devices ADM3485E是一款低功耗数据收发器，提供 ±15kV ESD保护，适用于多点总线传输线路的半双工通信。ADM3485E针对平衡数据传输而设计，符合TIA/EIA标准RS-485和RS-422。ADM3485E是半双工收发器，驱动器和接收器共用差分线路，但各自具有独立的使能输入。该器件具有12kΩ接收器输入阻抗，允许一条总线连接多达32个收发器。由于任一时间仅使能一个驱动器，因此禁用或关断驱动器的输出处于三态，避免总线过载。接收器具有故障安全特性，当输入浮地时，可确保输出保持逻辑高状态。热关断电路可防止总线竞争或输出短路导致功耗过大。
The devices have a 12kΩ receiver input impedance, which allows up to 32 transceivers on a bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus. The receivers have a fail-safe feature that ensures a logic high output when the inputs are floating. Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit.
特性
- TIA/EIA RS-485/RS-422 compliant
- ±15kV ESD protection on RS-485 input/output pins
- 12Mbps data rate
- Half-duplex transceiver Up to 32 nodes on the bus Receiver open-circuit, fail-safe design Low power shutdown current
- Outputs high-Z when disabled or powered off Common-mode input range: −7V to +12V Thermal shutdown and short-circuit protection Industry-standard 75176 pinout
- 8-lead narrow SOIC package
应用
- Power/energy metering
- Telecommunications
- EMI-sensitive systems Industrial control
- Local area networks
视频
Block Diagram
发布日期: 2013-08-14
| 更新日期: 2022-03-11