Overview
The ADM483EAR, produced by Analog Devices Inc., is a 5 V, low power data transceiver designed for half-duplex communication on multipoint bus transmission lines. It is compliant with EIA Standards RS-485 and RS-422, making it suitable for balanced data transmission. The device features ±15 kV ESD protection, reduced slew rate for low electromagnetic interference (EMI), and a single 5 V ± 10% power supply. It is ideal for operation in electrically harsh environments and applications where cables may be frequently plugged and unplugged.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Differential Output Voltage (VOD) | 1.5 | - | 5 | V | R = 27 Ω (RS-485), Figure 3 |
| Bus Common-Mode Range | -7 | - | 12 | V | - |
| Data Rate | - | - | 250 | kbps | - |
| Supply Voltage | 4.5 | - | 5.5 | V | - |
| Operating Temperature | -40 | - | 85 | °C | - |
| Supply Current | - | - | 36 | μA | - |
| Shutdown Current | - | - | 0.1 | μA | - |
| Package Type | - | - | - | 8-SOIC | - |
Key Features
- ±15 kV ESD protection for robust operation in harsh environments.
- Reduced slew rate for low electromagnetic interference (EMI).
- Single 5 V ± 10% power supply.
- Up to 32 nodes on the bus due to 12 kΩ input impedance.
- Receiver open-circuit, fail-safe design ensuring a logic high output state if inputs are unconnected.
- Short-circuit protection and thermal shutdown to prevent excessive power dissipation.
- Half-duplex communication capability with shared differential pins for driver and receiver.
Applications
- Low power RS-485 systems.
- Electrically harsh environments.
- EMI sensitive applications.
- DTE-DCE interfaces.
- Packet switching and local area networks.
- Industrial control systems.
Q & A
- What is the primary function of the ADM483EAR?
The ADM483EAR is a 5 V, low power data transceiver designed for half-duplex communication on multipoint bus transmission lines, complying with EIA Standards RS-485 and RS-422.
- What level of ESD protection does the ADM483EAR offer?
The ADM483EAR offers ±15 kV ESD protection.
- What is the maximum data rate supported by the ADM483EAR?
The ADM483EAR supports data rates up to 250 kbps.
- What is the operating temperature range of the ADM483EAR?
The operating temperature range is from -40°C to +85°C.
- How many transceivers can be connected to a single bus?
Up to 32 transceivers can be connected to a single bus due to the 12 kΩ input impedance).
- What type of protection does the ADM483EAR have against excessive power dissipation?
The ADM483EAR has thermal shutdown circuitry to protect against excessive power dissipation during fault conditions).
- What is the supply current and shutdown current of the ADM483EAR?
The supply current is 36 μA, and the shutdown current is 0.1 μA).
- What package type is the ADM483EAR available in?
The ADM483EAR is available in an 8-SOIC package).
- What is the significance of the reduced slew rate in the ADM483EAR?
The reduced slew rate minimizes electromagnetic interference (EMI) and data errors caused by reflections from improperly terminated buses).
- What happens to the receiver output if the inputs are unconnected or floating?
The receiver output defaults to a logic high state if the inputs are unconnected or floating due to the fail-safe feature).
