Overview
The ADM489ARZ 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 contains a single differential line driver and a single differential line receiver, enabling full-duplex data transfer. Additionally, the ADM489 includes an extra receiver and driver enable control, enhancing its functionality. It operates from a single 5 V ± 10% power supply and features a thermal shutdown circuit to prevent excessive power dissipation during fault conditions.
Key Specifications
| Parameter | Value |
|---|---|
| Data Rate | Up to 250 kbps |
| Supply Voltage | Single 5 V ± 10% |
| Bus Common-Mode Range | −7 V to +12 V |
| Input Impedance | 12 kΩ |
| EFT Protection | 2 kV, meets IEC1000-4-4 |
| EM Immunity | Meets IEC1000-4-3 |
| Supply Current | 30 μA |
| Package Type | 14-Lead SOIC, PDIP, TSSOP |
| Operating Temperature Range | −40°C to +85°C |
Key Features
- Compliance with EIA RS-485 and RS-422 standards
- Full-duplex data transfer capability
- Slew rate limited drivers for low electromagnetic interference
- High EM immunity and reduced EFT protection
- Short-circuit protection and thermal shutdown circuit
- Fail-safe feature resulting in a logic high output state if inputs are unconnected (floating)
- Low power consumption with 30 μA supply current
- Support for up to 32 transceivers on the differential bus
Applications
- Low power RS-485 and RS-422 systems
- DTE-DCE interface
- Packet switching
- Local area networks
- Data concentration and data multiplexers
- Integrated services digital network (ISDN)
Q & A
- What are the primary standards that the ADM489ARZ complies with?
The ADM489ARZ complies with both EIA RS-485 and RS-422 standards. - What is the maximum data rate supported by the ADM489ARZ?
The ADM489ARZ supports data rates up to 250 kbps. - What is the supply voltage range for the ADM489ARZ?
The supply voltage range is a single 5 V ± 10%. - What is the bus common-mode range of the ADM489ARZ?
The bus common-mode range is −7 V to +12 V. - 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 protection features does the ADM489ARZ have?
The ADM489ARZ features short-circuit protection, thermal shutdown circuit, and 2 kV EFT protection meeting IEC1000-4-4. - What is the operating temperature range of the ADM489ARZ?
The operating temperature range is −40°C to +85°C. - What is the significance of the slew rate limited drivers in the ADM489ARZ?
The slew rate limited drivers reduce electromagnetic interference. - Does the ADM489ARZ 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 types of packages are available for the ADM489ARZ?
The ADM489ARZ is available in 14-Lead SOIC, PDIP, and TSSOP packages.
