ADM3491ARZ-REEL7

The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 are low power, differential line transceivers designed to operate using a single 3.3V 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 communication, while the ADM3483/ADM3485 are designed for half- duplex communication. The ADM3483/ADM3488 feature slew rate limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error- free data transmission at data rates up to 250 kbps. 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/RS- 422 applications
• Telecom
• Industrial process control
• HVAC

Key features

• Operate with 3.3 V supply
• Interoperable with 5 V logic
• EIA RS- 422 and RS- 485 compliant over full common- mode range
• Data rate options ADM3483/ADM3488:250 kbps ADM3485/ADM3490/ADM3491:10 Mbps
• Half- and full- duplex options
• Reduced slew rates for low EMI (ADM3483 and ADM3488)
• 2 nA supply current in shutdown mode (ADM3483/ADM3485/ADM3491)
• Up to 32 transceivers on the bus
• - 7V to +12V bus common- mode range
• Specified over the - 40°C to +85°C temperature range
• 8 ns skew (ADM3485/ADM3490/ADM3491)
• 8- lead SOIC and 14- lead SOIC (ADM3491 only) packages