Overview
The ADM4856ARZ, produced by Analog Devices Inc., is a high-speed, full-duplex differential line transceiver designed for RS-485 and RS-422 data communication. This device is part of the ADM4850 to ADM4857 series, which offers various data rate options and is suitable for multipoint bus transmission lines. The ADM4856ARZ is particularly optimized for applications requiring data rates of up to 2.5 Mbps.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Data Rate | 2.5 Mbps | ||
| Duplex Mode | Full Duplex | ||
| Supply Voltage | 4.75 V to 5.25 V | V | |
| Operating Temperature | -40°C to +85°C | °C | |
| Package Type | 8-SOIC (0.154", 3.90mm Width) | ||
| Number of Drivers/Receivers | 1/1 | ||
| Receiver Hysteresis | 20 mV | mV | |
| Propagation Delay (tPLH, tPHL) | 50 ns to 180 ns | ns | RLDIFF = 54 Ω, CL1 = CL2 = 100 pF |
| Rise/Fall Times (tR, tF) | 140 ns | ns | RLDIFF = 54 Ω, CL1 = CL2 = 100 pF |
Key Features
- EIA RS-485/RS-422 Compliance: The ADM4856ARZ is compliant with EIA Standards RS-485 and RS-422, ensuring compatibility with a wide range of applications.
- High-Speed Data Rate: Supports data rates up to 2.5 Mbps, making it suitable for high-speed data communication.
- Full Duplex Operation: Dedicated differential line driver outputs and receiver inputs enable full duplex communication.
- Low Electromagnetic Interference (EMI): Slew rate limited driver outputs reduce EMI and data errors caused by reflections from improperly terminated buses.
- True Fail-Safe Receiver Inputs: Ensures a logic high output level when the inputs are open or shorted, providing a known state before and after communication.
- Thermal Shutdown and Short-Circuit Protection: Prevents excessive power dissipation caused by bus contention or output shorting.
- Low Power Consumption: Maximum supply current of 5 µA in shutdown mode.
- Wide Bus Common-Mode Range: Operates over a bus common-mode range of -7 V to +12 V.
Applications
- Low Power RS-485 Applications: Ideal for systems where power consumption needs to be minimized.
- EMI Sensitive Systems: The slew rate limited outputs make it suitable for environments sensitive to electromagnetic interference.
- DTE to DCE Interfaces: Used in data terminal equipment to data communication equipment interfaces.
- Industrial Control: Suitable for industrial control systems requiring reliable and high-speed data communication.
- Packet Switching and Local Area Networks: Can be used in network applications where high-speed data transmission is necessary.
- Automotive Applications: Qualified for use in automotive systems due to its robust operating temperature range and reliability features.
Q & A
- What is the data rate of the ADM4856ARZ?
The ADM4856ARZ supports a data rate of up to 2.5 Mbps.
- What are the operating temperature ranges for the ADM4856ARZ?
The device operates over a temperature range of -40°C to +85°C.
- Is the ADM4856ARZ compliant with RS-485 and RS-422 standards?
Yes, the ADM4856ARZ is compliant with EIA Standards RS-485 and RS-422.
- What is the supply voltage range for the ADM4856ARZ?
The supply voltage range is 4.75 V to 5.25 V.
- Does the ADM4856ARZ have built-in protection features?
Yes, it includes thermal shutdown and short-circuit protection to prevent excessive power dissipation.
- What is the receiver hysteresis of the ADM4856ARZ?
The receiver hysteresis is 20 mV.
- Can the ADM4856ARZ be used in full duplex mode?
Yes, the ADM4856ARZ supports full duplex operation with dedicated differential line driver outputs and receiver inputs.
- How many transceivers can be connected on one bus?
Up to 256 transceivers can be connected on one bus due to the 1/8-unit load receiver input impedance.
- Is the ADM4856ARZ suitable for automotive applications?
Yes, it is qualified for use in automotive applications.
- What is the maximum supply current in shutdown mode?
The maximum supply current in shutdown mode is 5 µA.
