(ADMx48xE) transceivers
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5 V, ±15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers ADM485E/ADM487E/ADM1487E
FEATURES...
Description
www.DataSheet4U.com
5 V, ±15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers ADM485E/ADM487E/ADM1487E
FEATURES
TIA/EIA RS-485-/RS-422-compliant ESD protection on RS-485 I/O pins ±15 kV human body model Data rates ADM487E: 250 kbps ADM485E/ADM1487E: 2.5 Mbps Half-duplex options Reduced slew rates for low EMI −7 V to +12 V common-mode input range Thermal shutdown and short-circuit protection 8-lead SOIC packages
FUNCTIONAL BLOCK DIAGRAM
VCC
ADM485E/ ADM487E/ ADM1487E
RO RE DE DI D
06356-001
R A B
APPLICATIONS
Energy/power metering Lighting systems Industrial control Telecommunications Security systems Instrumentation
GND
Figure 1.
GENERAL DESCRIPTION
The ADM485E/ADM487E/ADM1487E are 5 V, low power data transceivers with ±15 kV ESD protection suitable for halfduplex 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. The driver outputs are slew rate-limited to reduce EMI and data errors caused by reflections from improperly terminated buses. Excessive power dissipation caused by...
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