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ADM4851

Analog Devices
Part Number ADM4851
Manufacturer Analog Devices
Description Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers
Published Jul 21, 2014
Detailed Description 5 V, Slew-Rate Limited, Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers ADM4850/ADM4851/ADM4852/ADM4853/ADM4854/A...
Datasheet PDF File ADM4851 PDF File

ADM4851
ADM4851


Overview
5 V, Slew-Rate Limited, Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers ADM4850/ADM4851/ADM4852/ADM4853/ADM4854/ADM4855/ADM4856/ADM4857 FEATURES EIA RS-485-/RS-422-compliant Data rate options ADM4850/ADM4854: 115 kbps ADM4851/ADM4855: 500 kbps ADM4852/ADM4856: 2.
5 Mbps ADM4853/ADM4857: 10 Mbps Half- and full-duplex options Reduced slew rates for low EMI True fail-safe receiver inputs 5 μA (maximum) supply current in shutdown mode Up to 256 transceivers on one bus Outputs high-Z when disabled or powered off −7 V to +12 V bus common-mode range Thermal shutdown and short-circuit protection Pin-compatible with the MAX308x Specified over the −40°C to +85°C temperature range Available in 8-lead SOIC, LFCSP, and MSOP packages Qualified for automotive applications FUNCTIONAL BLOCK DIAGRAMS VCC ADM4850/ADM4851/ ADM4852/ADM4853 RO RE DE DI D 04931-001 R A B GND Figure 1.
VCC ADM4854/ADM4855/ ADM4856/ADM4857 A RO R B Z DI D Y 04931-028 APPLICATIONS Low power RS-485 applications EMI-sensitive systems DTE-DCE interfaces Industrial control Packet switching Local area networks Level translators GND Figure 2.
GENERAL DESCRIPTION The ADM4850/ADM4851/ADM4852/ADM4853/ADM4854/ ADM4855/ADM4856/ADM4857 are differential line transceivers suitable for high speed half- and full-duplex data communication on multipoint bus transmission lines.
They are designed for balanced data transmission and comply with EIA Standards RS-485 and RS-422.
The ADM4850/ADM4851/ADM4852/ADM4853 are halfduplex transceivers that share differential lines and have separate enable inputs for the driver and receiver.
The full-duplex ADM4854/ADM4855/ADM4856/ADM4857 transceivers have dedicated differential line driver outputs and receiver inputs.
The parts have a 1/8-unit-load receiver input impedance, which allows up to 256 transceivers on one bus.
Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is three-stated to avoid overloading the bus.
The rece...


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