Overview
The ADM2481BRWZ-RL7 is a half-duplex, iCoupler isolated RS-485 transceiver manufactured by Analog Devices Inc. This device combines electrical data isolation with a three-state differential line driver and a differential receiver, utilizing iCoupler technology. It is designed to provide reliable and isolated communication in industrial and other harsh environments.
The ADM2481BRWZ-RL7 is fully specified over the industrial temperature range of −40°C to +85°C and is available in a 16-lead, wide body SOIC package. It complies with ANSI TIA/EIA-485-A and ISO 8482: 1987(E) standards, ensuring compatibility with a wide range of RS-485 applications.
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Manufacturer | Analog Devices Inc. | ||
| Package | SOIC-16-300mil | ||
| Data Rate | 500 kbps | ||
| Propagation Delay | 250 - 620 ns | ns | RL = 54 Ω, CL1 = CL2 = 100 pF |
| Slew Rate | Limited to reduce reflections | Improperly terminated transmission lines | |
| Input Impedance | 96 kΩ | kΩ | Allows up to 256 transceivers on the bus |
| Power Supply (Logic Side) | 3.0 V to 5.5 V | V | VDD1 |
| Power Supply (Bus Side) | 4.75 V to 5.25 V | V | VDD2 |
| Operating Temperature | −40°C to +85°C | °C | |
| Electrical Isolation | 2.5 kV | kV |
Key Features
- Half-duplex, iCoupler isolated RS-485 transceiver with electrical data isolation
- Complies with ANSI TIA/EIA-485-A and ISO 8482: 1987(E) standards
- Maximum data rate of 500 kbps
- Slew rate-limited driver outputs to reduce reflections with improperly terminated transmission lines
- Low power operation: maximum 2.5 mA
- Suitable for 5 V or 3.3 V operations (VDD1)
- High common-mode transient immunity: >25 kV/μs
- True fail-safe receiver inputs ensuring a logic-high receiver output level when inputs are open or shorted
- Active-high enable feature for the driver and active-low enable feature for the receiver
- Current limiting and thermal shutdown features for protection against output short circuits and bus contention
Applications
- Industrial automation and control systems
- Building automation and control systems
- Medical devices requiring isolated communication
- Aerospace and defense applications
- Any system requiring reliable, isolated RS-485 communication in harsh environments
Q & A
- What is the maximum data rate of the ADM2481BRWZ-RL7?
The maximum data rate is 500 kbps.
- What is the operating temperature range of the ADM2481BRWZ-RL7?
The operating temperature range is −40°C to +85°C.
- What type of package does the ADM2481BRWZ-RL7 come in?
The device is available in a 16-lead, wide body SOIC package.
- Does the ADM2481BRWZ-RL7 comply with any specific standards?
Yes, it complies with ANSI TIA/EIA-485-A and ISO 8482: 1987(E) standards.
- What is the electrical isolation rating of the ADM2481BRWZ-RL7?
The electrical isolation rating is 2.5 kV.
- What is the input impedance of the ADM2481BRWZ-RL7?
The input impedance is 96 kΩ, allowing up to 256 transceivers on the bus.
- Does the ADM2481BRWZ-RL7 have any built-in protection features?
Yes, it includes current limiting and thermal shutdown features to protect against output short circuits and bus contention.
- What is the power supply range for the logic side and bus side of the ADM2481BRWZ-RL7?
The logic side (VDD1) operates from 3.0 V to 5.5 V, and the bus side (VDD2) operates from 4.75 V to 5.25 V.
- What is the slew rate limitation of the driver outputs in the ADM2481BRWZ-RL7?
The driver outputs are slew rate-limited to reduce reflections with improperly terminated transmission lines.
- Does the ADM2481BRWZ-RL7 have true fail-safe receiver inputs?
Yes, the receiver inputs have a true fail-safe feature ensuring a logic-high receiver output level when inputs are open or shorted.
