Analog Devices Inc. ADM2495E/ADM2495E-1 RS-485 Transceivers
Analog Devices ADM2495E/ADM2495E-1 Half-Duplex RS-485 Transceivers are 5.7kVRMS, signal-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 a margin on a 2-layer printed circuit board (PCB) with high-frequency decoupling capacitors. The isolation barrier provides robust system-level immunity to IEC 61000-4-x system-level electromagnetic compatibility (EMC) standards. The devices are suitable for applications that require reinforced insulation against working voltages of 1060VRMS and 1500VDC for the device's lifetime. 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 Analog Devices ADM2495E/ADM2495E-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 feature allows for robust protection against transients and accidental connection to ±12V and ±24V power supplies. The device's common mode range is extended to ±25V for applications with large ground offsets and long cable runs.
The ADM2495E has a reduced slew rate with 250kbps speed for operation over long cable runs with lower emissions. The ADM2495E-1 has a high 20Mbps data rate for maximum data transfer. The high differential output voltage makes these devices suitable for PROFIBUS® nodes when powered with 5V on the VDD2 supply. The VDD1 primary supply and VDD2 isolated supply support a wide range of voltages (1.7V to 5.5V and 3.0V to 5.5V, respectively). The ADM2495E/ADM2495E-1 is available in the industry standard 16‑lead, wide body, standard SOIC_W package with 8.1mm creepage and clearance.
Features
- 5.7kVRMS isolated half-duplex RS-485/RS-422 transceiver
- ±60V fault protection on RS-485 A and B pins
- 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
- ADM2495E - low speed 250kbps for EMI control
- ADM2495E-1 - high speed 20Mbps data rate
- Flexible power supply inputs
- Primary VDD1 supply of 1.7V to 5.5V
- Isolated VDD2 supply of 3.0V to 5.5V
- PROFIBUS compliant for 5V VDD2
- Wide -40°C to +125°C operating temperature range
- High common-mode transient immunity of 250kV/μs
- Short-circuit, open-circuit, and floating input receiver fail-safe
- Supports >224x bus nodes (112kΩ receiver input impedance)
- Full hot-swap support (glitch-free power-up/power-down)
- Safety and regulatory approvals
- IEC 60747-17 (pending) with reinforced VIORM = 1500VPEAK
- UL 1577 (pending) with VISO = 5700VRMS 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)
- 16-lead, wide body, standard SOIC_W package with 8.1mm creepage and clearance in standard pinout
Applications
- Solar inverters
- Electrical test and measurement
- Industrial field buses
- Heating, ventilation, and air conditioning (HVAC) networks
- Building automation
Functional Block Diagram
Development Tool
Analog Devices Inc. EVAL-ADM2495EEBZ Evaluation Board for ADM2495E
Allows for simplified, efficient evaluation of the ADM2495E 250kbps half-duplex RS-485 transceiver.