Product Details
●The ADM483 is a low power differential line transceiver suitable for half-duplex data communication on multipoint bus trans-mission lines. It is designed for balanced data transmission, and complies with EIA Standards RS-485 and RS-422.The part contains a differential line driver and a differential line receiver. Both share the same differential pins, with either the driver or the receiver being enabled at any given time.
●The device has an input impedance of 12 kΩ, allowing up to 32 transceivers on one bus. Since 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. This high impedance driver output is maintained over the entire common-mode voltage range from –7 V to +12 V.
●The receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
●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 by output shorting is prevented by a thermal shutdown circuit.
●The part is fully specified over the industrial temperature range, and is available in an 8-lead SOIC package.
●### Features and Benefits
● EIA RS-485/RS-422-compliant
● Data Rates up to 250 kbps
● Slew-rate Limited for Low EMI
● 100 nA Supply Current in Shutdown Mode
● Low Power Consumption (120 µA)
● Up to 32 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 MAX483
● Specified over –40°C to +85°C Temperature Range
● Available in 8-lead SOIC Package
