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.

Applications

• Low power RS-485 and RS-422 systems
• DTE-DCE interface
• Packet switching
• Local area networks
• Data concentration
• Data multiplexers
• Integrated services digital network (ISDN)

• Complies with ANSI TIA/EIA-485-A-1998 and ISO 8482: 1987(E)
• 250 kbps data rate
• Single 5 V ± 10% supply
• ?7 V to +12 V bus common-mode range

• Connect up to 32 nodes on the bus
• Reduced slew rate for low EM interference
• Short-circuit protection
• 30 μA supply current

ADM489ABRMZ，封装：10-Lead MSOP，包装形式及数量：管装，50，工作温度：-40 to 85C，AD官网报价：1.33（100-499个）；1.13（1000+个）

ADM489ABRMZ-REEL7，封装：10-Lead MSOP，包装形式及数量：卷带，1000，工作温度：-40 to 85C，AD官网报价：1.33（100-499个）；1.13（1000+个）

ADM489ABRZ，封装：14-Lead SOIC，包装形式及数量：管装，56，工作温度：-40 to 85C，AD官网报价：1.28（100-499个）；1.08（1000+个）

ADM489ABRZ-REEL7，封装：14-Lead SOIC，包装形式及数量：卷带，1000，工作温度：-40 to 85C，AD官网报价：1.28（100-499个）；1.08（1000+个）

EVAL-RS485FDEBZ：标准RS-485全双工（14引脚SOIC封装）评估板EVAL-RS485FDEBZ

EVAL-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。