Overview
The ADM4853AR, produced by Analog Devices Inc., is a high-speed, half-duplex differential line transceiver designed for RS-485 and RS-422 data communication. This device is part of the ADM4850 to ADM4857 family, which offers various data rate options to suit different application needs. The ADM4853AR is specifically optimized for a data rate of 10 Mbps, making it suitable for high-speed data transmission in multipoint bus transmission lines.
The device is engineered to comply with EIA Standards RS-485 and RS-422, ensuring reliable and balanced data transmission. It features reduced slew rates to minimize electromagnetic interference (EMI) and data errors caused by reflections from improperly terminated buses.
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Data Rate | 10 Mbps | ||
| Propagation Delay (tPLH, tPHL) | 0 - 30 ns | RLDIFF = 54 Ω, CL1 = CL2 = 100 pF | |
| Skew (tSKEW) | 10 ns | RLDIFF = 54 Ω, CL1 = CL2 = 100 pF | |
| Rise/Fall Times (tR, tF) | 30 ns | RLDIFF = 54 Ω, CL1 = CL2 = 100 pF | |
| Enable Time (tZH, tZL) | 35 ns | RL = 500 Ω, CL = 100 pF | |
| Disable Time (tLZ, tHZ) | 35 ns | RL = 500 Ω, CL = 100 pF | |
| Supply Current in Shutdown Mode | 5 µA (maximum) | ||
| Bus Common-Mode Range | -7 V to +12 V | ||
| Operating Temperature Range | -40°C to +85°C | ||
| Package Types | 8-lead SOIC, 8-lead LFCSP, 8-lead MSOP |
Key Features
- Compliance with EIA Standards RS-485 and RS-422: Ensures compatibility and reliability in data communication.
- High-Speed Data Rate: Supports up to 10 Mbps data rate for high-speed applications.
- Half-Duplex Operation: Shares differential lines with separate enable inputs for the driver and receiver.
- Reduced Slew Rates: Minimizes electromagnetic interference (EMI) and data errors.
- True Fail-Safe Receiver Inputs: Ensures a logic high output level when the inputs are open or shorted.
- Thermal Shutdown and Short-Circuit Protection: Prevents excessive power dissipation and protects against bus contention or output shorting.
- Low Power Consumption: 5 µA (maximum) supply current in shutdown mode.
- Wide Bus Common-Mode Range: Operates over a range of -7 V to +12 V.
- Support for Multiple Transceivers on One Bus: Up to 256 transceivers can be connected on one bus.
Applications
- Low Power RS-485 Applications: Ideal for systems where power efficiency is crucial.
- EMI Sensitive Systems: Reduces EMI through slew rate limiting.
- DTE to DCE Interfaces: Suitable for data terminal equipment to data circuit-terminating equipment interfaces.
- Industrial Control: Used in industrial automation and control systems.
- Packet Switching and Local Area Networks: Applicable in network communication systems.
- Level Translators: Can be used as level translators in various communication systems.
- Automotive Applications: Qualified for use in automotive environments.
Q & A
- What is the data rate of the ADM4853AR?
The ADM4853AR supports a data rate of up to 10 Mbps.
- Is the ADM4853AR compliant with RS-485 and RS-422 standards?
Yes, the ADM4853AR is compliant with EIA Standards RS-485 and RS-422.
- What is the operating temperature range of the ADM4853AR?
The operating temperature range is -40°C to +85°C.
- What types of packages are available for the ADM4853AR?
The device is available in 8-lead SOIC, 8-lead LFCSP, and 8-lead MSOP packages.
- How many transceivers can be connected on one bus?
Up to 256 transceivers can be connected on one bus.
- What is the supply current in shutdown mode?
The supply current in shutdown mode is 5 µA (maximum).
- Does the ADM4853AR have thermal shutdown protection?
Yes, it has thermal shutdown and short-circuit protection to prevent excessive power dissipation.
- What is the bus common-mode range of the ADM4853AR?
The bus common-mode range is -7 V to +12 V.
- Does the ADM4853AR have true fail-safe receiver inputs?
Yes, the receiver inputs have a true fail-safe feature that ensures a logic high output level when the inputs are open or shorted.
- Is the ADM4853AR suitable for automotive applications?
Yes, it is qualified for automotive applications.
