Overview
The ADM483EAR-1, produced by Analog Devices Inc., is a 5 V, low power data transceiver designed for half-duplex communication on multipoint bus transmission lines. It complies with TIA/EIA Standards RS-485 and RS-422, making it suitable for balanced data transmission. This transceiver features ±15 kV ESD protection, reduced slew rate for low EMI interference, and a single 5 V ± 10% power supply. It is particularly useful in electrically harsh environments and applications sensitive to electromagnetic interference (EMI).
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Voltage - Supply | 4.5 | 5 | 5.5 | V | |
| Operating Temperature | -40 | 85 | °C | ||
| Data Rate | 250 | kbps | |||
| Differential Output Voltage (VOD) | 1.5 | 5 | V | R = 27 Ω (RS-485), Figure 3 | |
| Common-Mode Output Voltage | -7 | 12 | V | ||
| Receiver Hysteresis | 70 | mV | |||
| Supply Current | 36 | μA | |||
| Shutdown Current | 0.1 | μA | |||
| Package | 8-SOIC |
Key Features
- ±15 kV ESD protection for robust operation in harsh environments.
- Reduced slew rate to minimize EMI and data errors caused by reflections from improperly terminated buses.
- Single 5 V ± 10% power supply and low power consumption (36 μA supply current, 0.1 μA shutdown current).
- Compliance with TIA/EIA Standards RS-485 and RS-422, allowing up to 32 transceivers on the bus.
- Receiver open-circuit fail-safe design, ensuring a logic high output if the inputs are unconnected or floating.
- Thermal shutdown circuitry to protect against excessive power dissipation during fault conditions.
- Short-circuit protection and high impedance state for disabled or power-down drivers to avoid bus overloading.
Applications
- Low power RS-485 systems.
- Electrically harsh environments where ESD protection is crucial.
- EMI sensitive applications requiring reduced slew rate for minimal interference.
- DTE-DCE interface and packet switching applications.
- Local area networks (LANs) and other multipoint bus transmission systems.
Q & A
- What is the primary function of the ADM483EAR-1?
The ADM483EAR-1 is a 5 V, low power data transceiver designed for half-duplex communication on multipoint bus transmission lines, complying with RS-485 and RS-422 standards.
- What level of ESD protection does the ADM483EAR-1 offer?
The ADM483EAR-1 offers ±15 kV ESD protection.
- What is the maximum data rate supported by the ADM483EAR-1?
The ADM483EAR-1 supports a maximum data rate of 250 kbps.
- What is the operating temperature range of the ADM483EAR-1?
The operating temperature range is -40°C to +85°C.
- How many transceivers can be connected to a single bus using the ADM483EAR-1?
Up to 32 transceivers can be connected to a single bus.
- What is the purpose of the thermal shutdown circuitry in the ADM483EAR-1?
The thermal shutdown circuitry protects the device from excessive power dissipation during fault conditions by disabling the driver outputs when a high temperature is detected.
- What is the receiver open-circuit fail-safe feature in the ADM483EAR-1?
The receiver open-circuit fail-safe feature ensures a logic high output if the inputs are unconnected or floating.
- What is the supply current and shutdown current of the ADM483EAR-1?
The supply current is 36 μA, and the shutdown current is 0.1 μA.
- In what package is the ADM483EAR-1 available?
The ADM483EAR-1 is available in an 8-lead SOIC package.
- What are some common applications of the ADM483EAR-1?
Common applications include low power RS-485 systems, electrically harsh environments, EMI sensitive applications, DTE-DCE interfaces, packet switching, and local area networks.
