ADM489A是AD公司的一款接口RS-485和RS-422产品，ADM489A是5 V, Slew-Rate Limited, Low Power, 250 kbps, Full Duplex EIA RS-485 Transceiver (with DE/RE)，本站介绍了ADM489A的封装应用图解、特点和优点、功能等，并给出了与ADM489A相关的AD元器件型号供参考。
ADM489A - 5 V, Slew-Rate Limited, Low Power, 250 kbps, Full Duplex EIA RS-485 Transceiver (with DE/RE) - 接口RS-485和RS-422 - 接口和隔离 - Analog Devices, LLC
The ADM488A and ADM489A are low power, differential line transceivers suitable for communication on multipoint bus transmission lines. They are intended for balanced data transmission and comply with both RS-485 and RS-422 standards of the Electronics Industries Association (EIA). Both products contain a single differential line driver and a single differential line receiver, making them suitable for full-duplex data transfer. The ADM489A contains an additional receiver and driver enable control.
The input impedance is 12 kΩ, allowing 32 transceivers to be connected on the bus. The ADM488A/ADM489A operate from a single 5 V ± 10% power supply.
Excessive power dissipation that is caused by bus contention or output shorting is prevented by a thermal shutdown circuit. This feature forces the driver output into a high impedance state if, during fault conditions, a significant temperature increase is detected in the internal driver circuitry.The receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
The ADM488A/ADM489A are fabricated on BiCMOS, an advanced mixed technology process combining low power CMOS with fast switching bipolar technology.
The ADM488A/ADM489A are fully specified over the industrial temperature range and are available in SOIC and MSOP packages.
ApplicationsEVAL-RS485FDEBZ支持轻松而快速地评估采用标准14引脚SOIC封装的全双工RS-485收发器。该评估板允许通过螺丝端子板接口至数字I/O，以实现驱动器输入(DI)、接收器输出(RO)、驱动器使能(DE)和接收器输出(RO)。总线信号A、B、Y和Z（全双工总线）可连接至一个总线螺丝端子板。A、B之间以及Y、Z之间连接端接电阻。端接电阻可在半双工配置下连接（A至Y、B至Z），以便对RS-485驱动器进行评估。针对接收器输入端的上拉和下拉（偏置电阻）提供封装，以便评估采用该配置的RS-485接收器。
用于板上评估的器件需另外订购。
无
