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ADM485

Analog Devices
Part Number ADM485
Manufacturer Analog Devices
Description 5V Low Power EIA RS-485 Transceiver
Published Mar 23, 2005
Detailed Description FEATURES Meets EIA RS-485 standard 5 Mbps data rate Single 5 V supply –7 V to +12 V bus common-mode range High speed, lo...
Datasheet PDF File ADM485 PDF File

ADM485
ADM485

Overview
FEATURES Meets EIA RS-485 standard 5 Mbps data rate Single 5 V supply –7 V to +12 V bus common-mode range High speed, low power BiCMOS Thermal shutdown protection Short-circuit protection Driver propagation delay: 10 ns typical Receiver propagation delay: 15 ns typical High-Z outputs with power off Superior upgrade for LTC485 APPLICATIONS Low power RS-485 systems DTE/DCE interface Packet switching Local area networks (LNAs) Data concentration Data multiplexers Integrated services digital network (ISDN) GENERAL 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 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 can be enabled independently.
When disabled, the outputs are three-stated.
The ADM485 operates from a single 5 V power supply.
Excessive power dissipation caused by bus contention or by output shorting is prevented by a thermal shutdown circuit.
If during fault conditions, a significant temperature increase is detected in the internal driver circuitry, this feature forces the driver output into a high impedance state.
Up to 32 transceivers can be connected simultaneously on a bus, but only one driver should be enabled at any time.
It is important, therefore, that the remaining disabled drivers do not load the bus.
To ensure this, the ADM485 driver features high output impedance when disabled and when powered down, which minimizes the loading effect when the transceiver is not being used.
The high impedance driver output is maintained over the common-mode voltage range of −7 V to +12 V.
Rev.
F Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third part...


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