Overview
The ADM4857ARZ-REEL7 is a high-speed, full-duplex RS-485/RS-422 transceiver produced by Analog Devices Inc. This device is designed for multipoint bus transmission lines and is suitable for various high-speed data communication applications. It features separate enable inputs for the driver and receiver, allowing for flexible control over the communication channels. The ADM4857ARZ-REEL7 is available in an 8-lead SOIC package and operates over a wide temperature range of -40°C to +85°C.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Data Rate | 10 Mbps | ||
| Supply Voltage | 4.75 V to 5.25 V | ||
| Operating Temperature | -40°C to +85°C | ||
| Package Type | 8-lead SOIC | ||
| Bus Common-Mode Range | -7 V to +12 V | ||
| Propagation Delay (Driver) | 0 to 30 ns | RLDIFF = 54 Ω, CL1 = CL2 = 100 pF | |
| Rise/Fall Times (Driver) | 30 ns | RLDIFF = 54 Ω, CL1 = CL2 = 100 pF | |
| Supply Current in Shutdown Mode | 5 µA (max) |
Key Features
- RS-485/RS-422 Compliance: Meets EIA standards for RS-485 and RS-422 interfaces.
- High-Speed Data Rate: Supports data rates up to 10 Mbps.
- Half-Duplex and Full-Duplex Options: Flexible configuration for different communication needs.
- Reduced Slew Rates: Minimizes electromagnetic interference (EMI).
- True Fail-Safe Receiver Inputs: Ensures a logic high output level when inputs are open or shorted.
- Thermal Shutdown and Short-Circuit Protection: Enhances device reliability and safety.
- Pin-Compatible with MAX308x: Easy replacement and compatibility with other devices.
- Outputs High-Z When Disabled or Powered Off: Prevents bus overloading.
Applications
- Low Power RS-485 Applications: Ideal for energy-efficient designs.
- EMI Sensitive Systems: Reduces electromagnetic interference.
- 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: Useful in voltage translation applications.
Q & A
- What is the maximum data rate supported by the ADM4857ARZ-REEL7?
The ADM4857ARZ-REEL7 supports a maximum data rate of 10 Mbps.
- What is the operating temperature range of the ADM4857ARZ-REEL7?
The device operates over a temperature range of -40°C to +85°C.
- What type of package is the ADM4857ARZ-REEL7 available in?
The ADM4857ARZ-REEL7 is available in an 8-lead SOIC package.
- Does the ADM4857ARZ-REEL7 have thermal shutdown protection?
Yes, the device features thermal shutdown and short-circuit protection.
- What is the bus common-mode range of the ADM4857ARZ-REEL7?
The bus common-mode range is -7 V to +12 V.
- 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.
- What is the supply current in shutdown mode?
The supply current in shutdown mode is 5 µA (maximum).
- Does the ADM4857ARZ-REEL7 have reduced slew rates for EMI reduction?
Yes, the device has reduced slew rates to minimize electromagnetic interference (EMI).
- What is the true fail-safe feature of the receiver inputs?
The true fail-safe feature ensures a logic high output level when the inputs are open or shorted.
- Is the ADM4857ARZ-REEL7 pin-compatible with other devices?
Yes, it is pin-compatible with the MAX308x series.
- What happens to the outputs when the device is disabled or powered off?
The outputs are high-Z when the device is disabled or powered off to prevent bus overloading.
