ADM3490 3.3 V, Low Power, RS-485/RS-422 Transceiver (Full Duplex, 10 Mbps)

The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 are low power, differential line transceivers designed to operate using a single 3.3 V power supply. Low power consumption, coupled with a shutdown mode, makes the ADM3483/ADM3485/ADM3488/ ADM3490/ADM3491 ideal for power-sensitive applications.

The ADM3488/ADM3490/ADM3491 feature full-duplex com-munication, while the ADM3483/ADM3485 are designed for half-duplex communication.

The ADM3485/ADM3490/ADM3491 transmit at up to 10 Mbps. The receiver input impedance is 12 kΩ, allowing up to 32 transceivers to be connected on the bus. A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting. If a significant temperature increase is detected in the internal driver circuitry during fault conditions, then the thermal shutdown circuit forces the driver output into a high impedance state. If the inputs are unconnected (floating), the receiver contains a fail-safe feature that results in a logic high output state. The parts are fully specified over the commercial and industrial temperature ranges. The ADM3483/ADM3485/ADM3488/ADM3490 are available in 8-lead SOIC_N; the ADM3491 is available in a 14-lead SOIC_N.

Applications

Low-Power RS-485 Applications
Telecom
Industrial Process Control
HVAC

Features and Benefits

Operate with 3.3 V supply
Interoperable with 5 V logic
EIA RS-485/RS-422 Compliant over Full Common-Range
Data Rate Options: 10 Mbps
Half and Full Duplex Options

Up to 32 Transceivers on a Bus
-7V to +12V Bus Common Mode Range
Specified over –40°C to +85°C Temperature Range
8 ns skew
Available in 8-Lead SOIC

Interface & Isolation

Interface RS-485 and RS-422

Data Sheets

Document	note
ADM3483/ADM3485/ADM3488/ADM3490/ADM3491: 3.3V Slew Rate Limited, Half and Full Duplex, RS-485/RS-422 Transceivers Data Sheet (Rev. E)	PDF 449 kB

Application Notes

Document	note
AN-1176: Component Footprints and Symbols in the Binary .Bxl File Format (Rev. 0)	PDF 671 kB
AN-960: RS-485/RS-422 Circuit Implementation Guide (Rev. 0)	PDF 245 kB