ADM489A中文资料5 V, Slew-Rate Limited, Low Power, 250 kbps, Full Duplex EIA RS-485 Transceiver (with DE/RE)数据手册ADI规格书

描述 Description

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.

ApplicationsLow power RS-485 and RS-422 systemsDTE-DCE interfacePacket switchingLocal area networksData concentrationData multiplexersIntegrated services digital network (ISDN)

特性 Features

• 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

简介

ADM489A属于集成电路（IC）的驱动器接收器收发器。由制造生产的ADM489A驱动器，接收器，收发器该系列产品的主要功能是提供必需的硬件资源，以通过延长电缆或印制线进行通信。确切的功能会因所采用的通信协议而异，可能包括诸如瞬态抑制之类的功能，这些功能对于通信用途可能并非绝对必要，但对于可能的使用环境却是明智之选。