Overview
The ADM489ARUZ from Analog Devices Inc. is a full-duplex, low power, slew rate limited transceiver designed for communication on multipoint bus transmission lines. It complies with both EIA RS-485 and RS-422 standards, making it suitable for balanced data transmission. The device operates from a single 5 V ± 10% power supply and features a high level of robustness, including protection against radiated and conducted interference.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Supply Voltage | 4.5V to 5.5V | V | Single supply operation |
| Operating Temperature | -40°C to +85°C | °C | Industrial temperature range |
| Data Rate | Up to 250 kbps | kbps | Maximum data transfer rate |
| Bus Common-Mode Range | -7 V to +12 V | V | Common-mode voltage range |
| Input Impedance | 12 kΩ | Ω | Allowing up to 32 transceivers on the bus |
| Supply Current | 30 μA to 60 μA | μA | Outputs unloaded, receivers enabled |
| Driver Propagation Delay | 250 ns to 2000 ns | ns | Input to output delay |
| Driver Rise/Fall Time | 250 ns to 2000 ns | ns | Differential load conditions |
| Receiver Hysteresis | 70 mV | mV | Receiver input hysteresis |
| Package | 14-SOIC | - | Surface mount package |
Key Features
- Meets EIA RS-485 and RS-422 standards
- Single 5 V ± 10% power supply
- Low power consumption with supply current as low as 30 μA
- High EM immunity and reduced slew rate for low EM interference
- 2 kV EFT protection meets IEC1000-4-4 and high RF field immunity
- Short-circuit protection and thermal shutdown circuitry
- Fail-safe feature resulting in a logic high output state if inputs are unconnected
- Full-duplex operation with a single differential line driver and receiver
- Additional receiver and driver enable control on the ADM489 model
Applications
- Low power RS-485 and RS-422 systems
- DTE-DCE interfaces
- Packet switching and local area networks
- Data concentration and data multiplexers
- Integrated services digital network (ISDN)
- Multipoint bus transmission lines
Q & A
- What are the primary standards that the ADM489ARUZ complies with?
The ADM489ARUZ complies with both EIA RS-485 and RS-422 standards.
- What is the operating voltage range of the ADM489ARUZ?
The ADM489ARUZ operates from a single 5 V ± 10% power supply.
- What is the maximum data rate supported by the ADM489ARUZ?
The ADM489ARUZ supports data rates up to 250 kbps.
- How many transceivers can be connected on the differential bus?
Up to 32 transceivers can be connected on the differential bus due to the 12 kΩ input impedance.
- What kind of protection does the ADM489ARUZ offer against interference?
The ADM489ARUZ offers high EM immunity, 2 kV EFT protection, and reduced slew rate for low EM interference.
- Does the ADM489ARUZ have any fail-safe features?
Yes, the receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
- What is the purpose of the thermal shutdown circuit in the ADM489ARUZ?
The thermal shutdown circuit prevents excessive power dissipation by forcing the driver output into a high impedance state if a significant temperature increase is detected during fault conditions.
- What is the typical application scenario for the ADM489ARUZ?
A typical application is a full-duplex link where data is transferred at rates of up to 250 kbps, often used in multipoint connections.
- What kind of package is the ADM489ARUZ available in?
The ADM489ARUZ is available in a 14-SOIC (Surface Mount) package.
- Is the ADM489ARUZ suitable for use in electrically harsh environments?
Yes, the ADM489ARUZ is designed to operate in electrically harsh environments and is immune to high RF field strengths without special shielding precautions.
