Overview
The ADM1485ARM, produced by Analog Devices Inc., is a high-speed, half-duplex RS422/RS485 transceiver designed for bidirectional data communication on multipoint bus transmission lines. It complies with both RS-485 and RS-422 EIA standards, making it suitable for a variety of industrial and communication applications. The device operates from a single 5 V power supply and features thermal shutdown protection and short-circuit protection to prevent excessive power dissipation.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Data Rate | - | - | 30 Mbps | - | - |
| Number of Drivers/Receivers | - | - | 1/1 | - | - |
| Duplex | - | - | Half | - | - |
| Receiver Hysteresis | - | - | 70 mV | - | - |
| Voltage Supply | 4.75 V | - | 5.25 V | V | - |
| Operating Temperature | -40°C | - | 85°C | °C | - |
| Driver Propagation Delay | - | 10 ns | - | ns | - |
| Receiver Propagation Delay | - | 15 ns | - | ns | - |
| Package | - | - | 8-SOIC or 8-DIP | - | - |
Key Features
- Meets EIA RS-485 and RS-422 standards
- High-speed data rate capability of up to 30 Mbps
- Single 5 V power supply operation (4.75 V to 5.25 V)
- Wide bus common-mode range: –7 V to +12 V
- Thermal shutdown protection and short-circuit protection
- Receiver with 70 mV hysteresis for improved noise immunity
- Low propagation delays: 10 ns for driver, 15 ns for receiver
- High-Z outputs when power is off
- Robust ESD protection
- Compact surface mount package (8-SOIC) or through-hole mounting (8-DIP)
Applications
- Industrial automation
- Communication equipment
- Data acquisition systems
- Packet switching and local area networks
- Data concentration and multiplexers
- Integrated Services Digital Network (ISDN)
- Networked devices in harsh environments
Q & A
- What is the data rate capability of the ADM1485ARM?
The ADM1485ARM supports data rates up to 30 Mbps.
- What power supply voltage does the ADM1485ARM operate on?
The device operates from a single 5 V power supply, with a voltage range of 4.75 V to 5.25 V.
- What are the key features of the receiver in the ADM1485ARM?
The receiver features 70 mV hysteresis for improved noise immunity and includes a fail-safe feature that guarantees a logic high when the inputs are open circuit or shorted.
- What is the operating temperature range of the ADM1485ARM?
The operating temperature range is from –40°C to 85°C.
- Does the ADM1485ARM have thermal protection?
Yes, it includes thermal shutdown protection that disables the driver outputs if the die temperature exceeds 150°C and re-enables them when it cools down to 140°C.
- What are the common applications of the ADM1485ARM?
Common applications include industrial automation, communication equipment, data acquisition systems, and networked devices in harsh environments.
- What is the package type of the ADM1485ARM?
The device is available in both 8-SOIC and 8-DIP packages.
- Is the ADM1485ARM compatible with RS422 and RS485 protocols?
Yes, it is compatible with both RS422 and RS485 communication protocols.
- What is the propagation delay of the driver and receiver in the ADM1485ARM?
The driver propagation delay is 10 ns, and the receiver propagation delay is 15 ns.
- Does the ADM1485ARM have ESD protection?
Yes, it is built with robust ESD protection.
