ADM1485ARZ

The ADM1485ARZ is one member of the ADM1485 series.The ADM1485 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 independently.When disabled, the outputs are tristated.

Features of the ADM1485ARZ are:(1)meets EIA RS-485 standard; (2)30 Mb/s data rate; (3)single +5 V supply; (4)7 V to +12 V bus common-mode range; (5)high speed, low power BiCMOS; (6)thermal shutdown protection; (7)zero skew driver; (8)driver propagation delay: 10 ns; (9)receiver propagation delay: 25 ns; (10)high Z outputs with power off; (11)superior upgrade for LTC1485.The ADM1485 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.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 absolute maximum ratings of the ADM1485ARZ can be summarized as:(1)Vcc:7V;(2)driver outputs:14 V to +14 V;(3)operating temperature range:0 to +70;(4)storage temperature range:65 to +150;(5)lead temperature(soldering,10 sec):300;(6)power dissipation 8-lead DIP:500 mW.Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum ratings for extended periods of time may affect device reliability.As with any transmission line, it is important that reflections are minimized. This may be achieved by terminating the extreme ends of the line using resistors equal to the characteristic impedance of the line. Stub lengths of the main line should also be kept as short as possible. A properly terminated transmission line appears purely resistive to the driver.