ADM3072E Datasheet

• TIA/EIA RS-485/RS-422 compliant
• ±15 kV ESD protection on RS-485 input/output pins
• Data rates
  • ADM3072E: 250 kbps
• Half- and full-duplex options
• True fail-safe receiver inputs
• Up to 256 nodes on the bus
• −40°C to +125°C temperature option
• Hot-swap input structure on DE and RE pins
• Reduced slew rates for low EMI
• Outputs high-Z when disabled or powered off
• Common-mode input range: −7 V to +12 V
• Thermal shutdown and short-circuit protection
• 8-lead and 14-lead narrow SOIC packages

• Power/energy metering
• Industrial control
• Lighting systems
• Telecommunications
• Security systems
• Instrumentation

The ADM3072E are 3.3 V, low power data transceivers with ±15 kV ESD protection suitable for full- and half-duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission, and they comply with TIA/EIA standards: RS-485 and RS-422.

The devices have a ⅛ unit load receiver input impedance, which allows up to 256 transceivers on a bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus.

The receiver inputs have a true fail-safe feature, which eliminates the need for external bias resistors and ensures a logic high output level when the inputs are open or shorted. This guarantees that the receiver outputs are in a known state before communication begins and when communication ceases.