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ADM1487E

Analog Devices
Part Number ADM1487E
Manufacturer Analog Devices
Description (ADMx48xE) transceivers
Published Mar 2, 2007
Detailed Description www.DataSheet4U.com 5 V, ±15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers ADM485E/ADM487E/ADM1487E FEATURES...
Datasheet PDF File ADM1487E PDF File

ADM1487E
ADM1487E

Overview
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 bus contention or output shorting is prevented with a thermal shutdown circuit.
The parts are fully specified over the industrial temperature ranges and are available in 8-lead SOIC packages.
Table 1.
Selection Table Part Number ADM485E ADM487E ADM1487E Half-/FullDuplex Half Half Half Guaranteed Data Rate (Mbps) 2.
5 0.
25 2.
5 Slew Rate Limited No Yes No Low Power Shutdown No Yes No Driver/Receiver Enable Yes Yes Yes Quiescent Current (μA) 300 120 230 Number of Nodes on Bus 32 128 128 Pin Count ...


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