ADM2484E Datasheet

• Isolated, RS-485/RS-422 transceiver, configurable as half- or full-duplex
• ±15 kV ESD protection on RS-485 input/output pins
• 500 kbps data rate
• Complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E)
• Suitable for 5 V or 3.3 V operation (V_DD1)
• High common-mode transient immunity: >25 kV/μs
• True fail-safe receiver inputs
• 256 nodes on the bus
• Thermal shutdown protection
• Safety and regulatory approvals
  • UL recognition
    • 5000 V rms isolation voltage for 1 minute per UL1577
  • VDE certificate of conformity
    • DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
    • Reinforced insulation, V_IORM = 849 V_PEAK
  • CSA Component Acceptance Notice 5A
    • IEC 60950-1: 380 V rms (reinforced)
• Operating temperature range: −40°C to +85°C
• Wide body, 16-lead SOIC package

• Isolated RS-485/RS-422 interfaces
• Industrial field networks
• INTERBUS
• Multipoint data transmission systems

The ADM2484E is an isolated data transceiver with ±15 kV ESD protection suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For half-duplex operation, the transmitter outputs and receiver inputs share the same transmission line. Transmitter Output Pin Y links externally to Receiver Input Pin A, and Transmitter Output Pin Z links externally to Receiver Input Pin B.

Designed for balanced transmission lines, the ADM2484E complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E). The device employs Analog Devices, Inc., iCoupler^® technology to combine a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package.

The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection up to ±15 kV using the human body model (HBM). The logic side of the device can be powered with either a 5 V or a 3.3 V supply, whereas the bus side requires an isolated 3.3 V supply.

The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention causes excessive power dissipation.