Overview
The ADM4855ARZ is a differential line transceiver produced by Analog Devices Inc., designed for high-speed, full-duplex data communication on multipoint bus transmission lines. It complies with EIA standards RS-485 and RS-422, making it suitable for balanced data transmission in various industrial and commercial applications. This transceiver is part of the ADM4850 to ADM4857 series, each with different data rate options.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Data Rate | 500 kbps | ||||
| Propagation Delay (tPLH, tPHL) | 50 | 180 | ns | RLDIFF = 54 Ω, CL1 = CL2 = 100 pF | |
| Skew (tSKEW) | 50 | ns | RLDIFF = 54 Ω, CL1 = CL2 = 100 pF | ||
| Rise/Fall Times (tR, tF) | 140 | ns | RLDIFF = 54 Ω, CL1 = CL2 = 100 pF | ||
| Supply Voltage (VCC) | 4.75 | 5 | 5.25 | V | |
| Bus Common-Mode Range | -7 | +12 | V | ||
| Operating Temperature Range | -40 | +85 | °C | ||
| Package Types | 8-lead SOIC, 8-lead LFCSP, 8-lead MSOP |
Key Features
- Compliance with EIA standards RS-485 and RS-422 for balanced data transmission.
- Full-duplex operation with dedicated differential line driver outputs and receiver inputs.
- High data rate of up to 500 kbps.
- Reduced slew rates for low electromagnetic interference (EMI).
- True fail-safe receiver inputs ensuring a logic-high output level when inputs are open or shorted.
- Thermal shutdown and short-circuit protection to prevent excessive power dissipation.
- High-Z outputs when disabled or powered off.
- Low supply current in shutdown mode (maximum 5 µA).
- Ability to support up to 256 transceivers on one bus.
Applications
- Low power RS-485 applications.
- EMI sensitive systems.
- DTE to DCE interfaces.
- Industrial control systems.
- Packet switching and local area networks.
- Data concentration and data multiplexers.
- Integrated services digital network (ISDN).
- Automotive applications.
Q & A
- What is the ADM4855ARZ used for?
The ADM4855ARZ is used for high-speed, full-duplex data communication on multipoint bus transmission lines, complying with EIA standards RS-485 and RS-422.
- What is the data rate of the ADM4855ARZ?
The data rate of the ADM4855ARZ is up to 500 kbps.
- What are the key features of the ADM4855ARZ?
Key features include compliance with RS-485 and RS-422 standards, full-duplex operation, reduced slew rates for low EMI, true fail-safe receiver inputs, thermal shutdown, and short-circuit protection.
- What is the operating temperature range of the ADM4855ARZ?
The operating temperature range is from -40°C to +85°C.
- What types of packages are available for the ADM4855ARZ?
The ADM4855ARZ is available in 8-lead SOIC, 8-lead LFCSP, and 8-lead MSOP packages.
- How many transceivers can be supported on one bus?
Up to 256 transceivers can be supported on one bus.
- What is the supply voltage range for the ADM4855ARZ?
The supply voltage range is from 4.75V to 5.25V.
- Does the ADM4855ARZ have thermal shutdown protection?
Yes, the ADM4855ARZ has thermal shutdown and short-circuit protection to prevent excessive power dissipation.
- What is the significance of the true fail-safe receiver inputs?
The true fail-safe receiver inputs ensure a logic-high output level when the inputs are open or shorted, providing a known state before and after communication.
- Can the ADM4855ARZ be used in automotive applications?
Yes, the ADM4855ARZ is qualified for automotive applications.
