Overview
The ADM485JNZ, produced by Analog Devices Inc., is a differential line transceiver designed for high-speed bidirectional data communication on multipoint bus transmission lines. It complies with the EIA RS-485 and RS-422 standards, making it suitable for a variety of applications requiring reliable and fast data transmission. The device operates from a single 5 V power supply and features a high-speed, low-power BiCMOS design, which combines the benefits of low power CMOS with the fast switching capabilities of bipolar technology.
Key Specifications
| Parameter | Specification |
|---|---|
| Data Rate | Up to 5 Mbps |
| Power Supply | Single 5 V |
| Bus Common-Mode Range | –7 V to +12 V |
| Driver Propagation Delay | 10 ns typical |
| Receiver Propagation Delay | 15 ns typical |
| Thermal Shutdown | Yes, prevents excessive power dissipation |
| Short-Circuit Protection | Yes |
| Package Options | 8-lead PDIP, 8-lead SOIC, 8-lead MSOP |
| Temperature Range | Commercial and industrial temperature range |
Key Features
- Meets EIA RS-485 and RS-422 standards
- High-speed, low-power BiCMOS design
- Single 5 V power supply
- –7 V to +12 V bus common-mode range
- Thermal shutdown protection and short-circuit protection
- High-Z outputs when power is off or driver is disabled
- Fail-safe receiver feature for unconnected inputs
- ESD protection on all inputs and outputs
- High source and sink current capability on driver outputs
Applications
- Low power RS-485 systems
- DTE/DCE interface
- Packet switching
- Local area networks (LANs)
- Data concentration
- Data multiplexers
- Integrated services digital network (ISDN)
Q & A
- What is the data rate of the ADM485JNZ?
The ADM485JNZ supports data rates up to 5 Mbps. - What is the power supply requirement for the ADM485JNZ?
The ADM485JNZ operates from a single 5 V power supply. - What is the bus common-mode range of the ADM485JNZ?
The bus common-mode range is –7 V to +12 V. - Does the ADM485JNZ have thermal shutdown protection?
Yes, the ADM485JNZ features thermal shutdown protection to prevent excessive power dissipation. - What types of packages are available for the ADM485JNZ?
The ADM485JNZ is available in 8-lead PDIP, 8-lead SOIC, and 8-lead MSOP packages. - What is the temperature range for the ADM485JNZ?
The ADM485JNZ is fully specified over the commercial and industrial temperature range. - Does the ADM485JNZ have ESD protection?
Yes, the ADM485JNZ has ESD protection on all inputs and outputs. - How many transceivers can be connected on a bus?
Up to 32 transceivers can be connected simultaneously on a bus, but only one driver should be enabled at any time. - What happens to the receiver output if the inputs are unconnected?
The receiver output will be in a logic high state if the inputs are unconnected (floating). - What technology is used in the fabrication of the ADM485JNZ?
The ADM485JNZ is fabricated using BiCMOS technology, combining low power CMOS with fast switching bipolar technology.
