GENERAL DESCRIPTION

The ADM1486 is a differential line transceiver suitable for high speed bidirectional data communication on multipoint bus transmission lines. It is designed for balanced data transmission, complies with EIA Standards RS-485 and RS-422, and is recommended for PROFIBUS applications. The part contains a differential line driver and a differential line receiver. Both the driver and the receiver may be enabled independently. When disabled or powered down, the driver outputs are high impedance.

The ADM1486 operates from a single 5 V power supply. Excessive power dissipation caused by bus contention or output shorting is prevented by short-circuit protection and thermal circuitry. Short-circuit protection circuits limit the maximum output current to ±200 mA during fault conditions. A thermal shutdown circuit senses if the die temperature rises above 150°C and forces the driver outputs into a high impedance state under this condition.

Up to 50 transceivers may be connected simultaneously on a bus, but only one driver should be enabled at a time. Therefore, it is important that the remaining disabled drivers do not load the bus.

To ensure this, the ADM1486 driver features high output impedance when disabled and when powered down. This minimizes the loading effect when the transceiver is not being used. The 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).

FEATURES

Meets and exceeds EIA RS-485 and EIA RS-422 standards

30 Mbps data rate

Recommended for PROFIBUS applications

2.1 V minimum differential output with 54 ? termination

Low power 0.8 mA ICC

Thermal shutdown and short-circuit protection

0.5 ns skew driver and receiver

Driver propagation delay: 11 ns

Receiver propagation delay: 12 ns

High impedance outputs with drivers disabled or power off

Superior upgrade for SN65ALS1176

Available in standard 8-lead SOIC package

APPLICATIONS

Industrial field equipment

ADM1486屬于集成電路（IC） > 驅動器，接收器，收發(fā)器。亞德諾半導體技術有限公司制造生產的ADM1486驅動器，接收器，收發(fā)器該系列產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行通信。確切的功能會因所采用的通信協議而異，可能包括諸如瞬態(tài)抑制之類的功能，這些功能對于通信用途可能并非絕對必要，但對于可能的使用環(huán)境卻是明智之選。