Overview
The ADM3491ARZ-REEL is a 3.3V, full-duplex RS-485/RS-422 interface integrated circuit (IC) manufactured by Analog Devices Inc. This device is designed for high-speed data transmission and is suitable for a variety of applications requiring reliable, noise-immune communication. The ADM3491 features a differential line driver and receiver with fail-safe circuitry, enabling data rates up to 10 Mbps and a wide common mode voltage range.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Supply Voltage (VCC) | 3.3 V | |
| Operating Temperature Range | -40°C to +85°C | |
| Data Rate | Up to 10 Mbps | |
| Driver Output Current Limit | 120 mA (typical) | |
| Receiver Input Threshold | 200 mV (typical) | |
| Propagation Delay | 8 ns (driver), under 10 ns (receiver) | VCC = 3.3 V, TA = 25°C |
| Shutdown Current | 2 nA (typical) | Low power shutdown mode |
| Package Type | 14-Lead Narrow Body Small Outline (SOIC_N) |
Key Features
- Full-Duplex Operation: Supports simultaneous transmission and reception of data.
- High-Speed Data Rate: Up to 10 Mbps data rate for fast communication.
- Fail-Safe Circuitry: Ensures the receiver output is in a known state when the inputs are open or shorted.
- Current Limit Protection: Prevents excessive output current and power dissipation due to faults or bus contention.
- Thermal Shutdown Circuit: Protects the device by forcing the driver outputs into a high impedance state if the die temperature rises excessively.
- Transient Surge Protection: Protects against transient surge conditions.
- ESD Protection: Provides protection against electrostatic discharge.
- Low Power Shutdown Mode: Draws only 2 nA of supply current when in shutdown mode.
Applications
- Industrial Automation: Suitable for industrial control systems and automation networks.
- Building Automation: Used in building management systems for reliable data transmission.
- Communications Systems: Ideal for point-to-point and multipoint bus transmission lines.
- Daisy-Chain Network Topology: Can be used in daisy-chain network configurations or point-to-point applications.
- Line Repeaters: Can be used as line repeaters to extend the length of the communication line.
Q & A
- What is the operating voltage range of the ADM3491ARZ-REEL?
The operating voltage range is 3.3 V.
- What is the maximum data rate supported by the ADM3491ARZ-REEL?
The maximum data rate is up to 10 Mbps.
- What type of protection does the ADM3491ARZ-REEL offer against excessive output current?
The device offers current limit protection and thermal shutdown circuitry.
- How does the low power shutdown mode work in the ADM3491ARZ-REEL?
The low power shutdown mode is initiated by bringing RE high and DE low, and the device typically draws only 2 nA of supply current in this mode.
- What is the typical propagation delay for the driver and receiver in the ADM3491ARZ-REEL?
The typical propagation delay is 8 ns for the driver and under 10 ns for the receiver.
- What type of package does the ADM3491ARZ-REEL come in?
The device comes in a 14-Lead Narrow Body Small Outline (SOIC_N) package.
- What are some common applications of the ADM3491ARZ-REEL?
Common applications include industrial automation, building automation, communications systems, and daisy-chain network topologies.
- Does the ADM3491ARZ-REEL support full-duplex operation?
Yes, the device supports full-duplex operation, allowing simultaneous transmission and reception of data.
- What kind of ESD protection does the ADM3491ARZ-REEL offer?
The device provides ESD protection to safeguard against electrostatic discharge.
- How should the communication line be terminated to minimize reflections?
The line must be terminated at both ends in its characteristic impedance, and stub lengths off the main line must be kept as short as possible.
