GENERAL DESCRIPTION

The ADM485E/ADM487E/ADM1487E are 5 V, low power data transceivers with ±15 kV ESD protection suitable for half duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with Telecommunication Industry Association/Electronics Industries Association (TIA/EIA) standards RS-485 and RS-422. The ADM487E and ADM1487E have a 1/4 unit load receiver input impedance that allows up to 128 transceivers on a bus, whereas the ADM485E allows up to 32 transceivers on a bus. Because only one driver is enabled at any time, the output of a disabled or power-down driver is three-stated to avoid overloading the bus.

FEATURES

TIA/EIA RS-485/RS-422 compliant

ESD protection on RS-485 I/O pins

±15 kV human body model (HBM)

Data rates

ADM487E: 250 kbps

ADM485E/ADM1487E: 2.5 Mbps

Half-duplex

Reduced slew rates for low EMI

Common-mode input range: −7 V to +12 V

Thermal shutdown and short-circuit protection

8-lead SOIC packages

ADM487EW qualified for automotive applications

APPLICATIONS

Energy/power metering

Lighting systems

Industrial control

Telecommunications

Security systems

Instrumentation