ADM485AR Analog Devices, ADM485AR Datasheet

ADM485AR

Manufacturer Part Number

ADM485AR

Description

Manufacturer

Analog Devices

Datasheets

1.ADM485AR.pdf (12 pages)

2.ADM485AR.pdf (8 pages)

Specifications of ADM485AR

Case

SOP8

00+

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Download datasheet (134Kb)

PRODUCT DESCRIPTION

The ADM485 is a differential line transceiver suitable for high

speed bidirectional data communication on multipoint bus

transmission lines. It is designed for balanced data transmission

and complies with both EIA Standards RS-485 and RS-422.

The part contains a differential line driver and a differential line

receiver. Both the driver and the receiver may be enabled inde-

pendently. When disabled, the outputs are tristated.

The ADM485 operates from a single +5 V power supply.

Excessive power dissipation caused by bus contention or by out-

put 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.

Up to 32 transceivers may be connected simultaneously on a

bus, but only one driver should be enabled at any time. It is im-

portant, therefore, that the remaining disabled drivers do not

load the bus. To ensure this, the ADM485 driver features high

output impedance when disabled and also when powered down.

This minimizes the loading effect when the transceiver is not

being utilized. 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 which results in a logic

high output state if the inputs are unconnected (floating).

The ADM485 is fabricated on BiCMOS, an advanced mixed

technology process combining low power CMOS with fast

switching bipolar technology. All inputs and outputs contain

protection against ESD; all driver outputs feature high source

and sink current capability. An epitaxial layer is used to guard

against latch-up.

The ADM485 features extremely fast switching speeds. Minimal

driver propagation delays permit transmission at data rates up to

5 Mbits/s while low skew minimizes EMI interference.

The part is fully specified over the commercial and industrial

temperature range and is available in an 8-lead DIL/SOIC package.

FUNCTIONAL BLOCK DIAGRAM

EIA RS-485 Transceiver

ADM485

+5 V Low Power

ADM485

GND

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