ADM2895E-1 Datasheet

• 5.7kV_RMS isolated half-duplex RS-485/RS-422 transceiver
• ±60V fault protection on RS-485 A and B pins
• Low radiated emissions, integrated, isolated DC-to-DC converter
• Meets EN 55032 Class B radiated emissions on a 2-layer PCB
• Robust protection on the RS-485 A and B bus pins
  • ≥ ±4kV IEC 61000-4-2 ESD
  • ±10kV HBM ESD
  • ≥ ±4kV IEC 61000-4-4 EFT
• Extended ±25V common-mode range
• Two speed options
  • ADM2895E-1 - high speed 20Mbps data rate
• Flexible power supplies
  • Primary input V_CC supply of 3.0V to 5.5V
  • Primary logic V_IO supply of 1.7V to 5.5V
  • V_SEL pin to select isolated V_ISO supply of 5V (V_CC > 4.5V) or 3.3V
• PROFIBUS compliant for 5V V_ISO
• Wide operating temperature range: −40°C to +105°C
• High common-mode transient immunity: 250kV/μs
• Short-circuit, open-circuit, and floating input receiver fail-safe
• Supports >224 bus nodes (112kΩ receiver input impedance)
• Full hot-swap support (glitch free power-up/power-down)
• Safety and regulatory approvals
  • IEC 60747-17 (pending)
  • • Reinforced V_IORM = 566V_PEAK
  • UL 1577 (pending)
    • V_ISO= 5700V_RMS for 1 minute
  • IEC/EN/CSA 62368-1 (pending)
  • IEC/EN/CSA 61010-1 (pending)
  • IEC/CSA 60601-1 (pending)
  • GB 4943.1 (pending)
• Complies with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E)
• Outline Dimensions with 8.3mm creepage and clearance in standard pinout

• Heating, ventilation, and air conditioning (HVAC) networks
• Industrial field buses
• Building automation
• Utility networks
• Energy meters

The ADM2895E-1 are 5.7k_VRMS signal and power isolated RS-485 transceivers with ±60V fault protection on the RS-485 A and B pins. These devices are designed for balanced transmission lines and comply with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E). The devices can pass radiated emissions testing to the EN 55032 Class B standard with margin on a 2-layer printed circuit board (PCB) with high-frequency decoupling capacitors and two small external 0402 ferrites on isolated power and ground pins. The device features an integrated, low electromagnetic interference (EMI), isolated DC-to-DC converter, which eliminates the need for an external isolated power supply. The isolation barrier provides immunity to system level electromagnetic compatibility (EMC) standards. The devices are suitable for applications that require reinforced insulation against working voltages of 400V_RMS and 566V_DC for the lifetime of the device. The devices are protected against ±4kV contact IEC 61000-4-2 and ±15kV human body model (HBM) electrostatic discharge (ESD) events on the RS-485 A and B pins and ±8kV contact IEC 61000-4-2 ESD across the barrier without latch-up or damage.

The ADM2895E-1 feature overvoltage protection on the RS-485 A and B pins to withstand up to ±60V DC or AC peak to the transceiver side GND2. This allows for robust protection against transients and accidental connection to ±12V or ±24V power supplies. The common-mode range of the device is extended to ±25V for applications with large ground offsets and long cable runs.

Please see the data sheet for the full description.