ADM3490ARZ-REEL7 RS-485/RS-422 Transceiver IC with Low Power Consumption, Robust

Product Specification

1. Half-Duplex RS-485/RS-422 Communication
   
   
   Integrates a single driver and a single receiver to enable bidirectional data transfer over a shared differential bus, eliminating the need for separate transmit/receive lines in half-duplex architectures.
2. Low Power Operation
   
   
   Features a low quiescent current (typically 300 μA) in active mode, and supports a power-down mode that reduces supply current to less than 0.1 μA, making it suitable for battery-powered or power-constrained applications.
3. Robust ESD Protection
   
   
   Provides ±15 kV electrostatic discharge (ESD) protection on the RS-485 bus pins (A and B), meeting IEC 61000-4-2 standards, which enhances system reliability in industrial environments prone to static discharges.
4. Wide Common-Mode Voltage Range
   
   
   Offers a common-mode voltage range of -7 V to +12 V, allowing the transceiver to operate over long cable lengths and in systems with significant ground potential differences between nodes.
5. Driver Slew-Rate Control
   
   
   Incorporates a controlled slew-rate driver to minimize electromagnetic interference (EMI) and reduce signal reflections, enabling data transmission rates up to 500 kbps without external components.
6. Receiver Input Sensitivity
   
   
   The receiver detects differential input voltages as low as ±200 mV, ensuring reliable data reception even in noisy industrial environments with degraded signal integrity.

Typical Applications

• Industrial Automation Systems
  
  
  Used in PLC (Programmable Logic Controller) networks, distributed I/O modules, and factory floor sensor/actuator communication links, where robust RS-485 connectivity is required.
• Building Automation
  
  
  Deployed in HVAC (Heating, Ventilation, and Air Conditioning) control systems, lighting control networks, and security systems for reliable multi-node communication.
• Smart Metering
  
  
  Integrated into electric, gas, and water meter reading systems, supporting long-distance data transmission between meters and concentrators over RS-485 buses.
• Transportation Systems
  
  
  Utilized in vehicle diagnostic tools, railway signaling systems, and public transit monitoring networks, leveraging its wide common-mode range and ESD protection for harsh environments.
• Battery-Powered Devices
  
  
  Ideal for portable industrial instruments, wireless sensor network gateways, and handheld data loggers, thanks to its low power consumption and power-down mode capability.
• Medical Equipment
  
  
  Applied in diagnostic devices and patient monitoring systems that require noise-immune, low-power serial communication.