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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 half-duplex 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.

Features

1. EIA RS-485-/RS-422-compliant
2. Data rate options
ADM4850/ADM4854: 115 kbps
ADM4851/ADM4855: 500 kbps
ADM4852/ADM4856: 2.5 Mbps
ADM4853/ADM4857: 10 Mbps

4. Half- and full-duplex options
5. Reduced slew rates for low EMI
6. True fail-safe receiver inputs
7. 5 μA (maximum) supply current in shutdown mode
8. Up to 256 transceivers on one bus

Applications : 

1. Low power RS-485 applications
2. EMI-sensitive systems
3. DTE-DCE interfaces
4. Industrial control
5. Packet switching
6. Local area networks
7. Level translators