GENERAL DESCRIPTION

The ADM483 is a low power differential line transceiver suitable for half-duplex data communication on multipoint bus transmission lines. It is designed for balanced data transmission, and complies with EIA Standards RS-485 and RS-422.The part contains a differential line driver and a differential line receiver. Both share the same differential pins, with either the driver or the receiver being enabled at any given time.

The device has an input impedance of 12 k?, allowing up to 32 transceivers on one bus. Since only one driver should be enabled at any time, the output of a disabled or powered-down driver is three-stated to avoid overloading the bus. This high impedance driver output is maintained over the entire common-mode voltage range from –7 V to +12 V.

The receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating). The driver outputs are slew-rate limited to reduce EMI and data errors caused by reflections from improperly terminated buses. Excessive power dissipation caused by bus contention or by output shorting is prevented by a thermal shutdown circuit.

The part is fully specified over the industrial temperature range, and is available in an 8-lead SOIC package.

FEATURES

EIA RS-485/RS-422-compliant

Data rates up to 250 kbps

Slew-rate limited for low EMI

100 nA supply current in shutdown mode

Low power consumption (120 μA)

Up to 32 transceivers on one bus

Outputs high-z when disabled or powered off

–7 V to +12 V bus common-mode range

Thermal shutdown and short-circuit protection

Pin-compatible with MAX483

Specified over –40°C to +85°C temperature range

Available in 8-lead SOIC package

APPLICATIONS

Low power RS-485 applications

EMI sensitive systems

DTE-DCE interfaces

Industrial control

Packet switching

Local area networks

Level translators

ADM483JR-REEL7屬于集成電路（IC） > 驅(qū)動(dòng)器，接收器，收發(fā)器。亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的ADM483JR-REEL7驅(qū)動(dòng)器，接收器，收發(fā)器該系列產(chǎn)品的主要功能是提供必需的硬件資源，以通過延長電纜或印制線進(jìn)行通信。確切的功能會(huì)因所采用的通信協(xié)議而異，可能包括諸如瞬態(tài)抑制之類的功能，這些功能對(duì)于通信用途可能并非絕對(duì)必要，但對(duì)于可能的使用環(huán)境卻是明智之選。