Overview
The ADM485ARMZ, 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 EIA standards RS-485 and RS-422, making it suitable for balanced data transmission. The transceiver features a differential line driver and a differential line receiver, both of which can be enabled independently. When disabled, the outputs are three-stated. Fabricated on BiCMOS technology, it combines low power CMOS with fast switching bipolar technology, ensuring high performance and reliability.
Key Specifications
| Specification | Value |
|---|---|
| Data Rate | Up to 5 Mbps |
| Supply Voltage | Single 5 V |
| Bus Common-Mode Range | −7 V to +12 V |
| Driver Propagation Delay | 10 ns typical |
| Receiver Propagation Delay | 15 ns typical |
| Operating Temperature Range | −40°C to +85°C |
| Package Types | 8-lead PDIP, 8-lead SOIC, 8-lead MSOP |
| Number of Transceivers on Bus | Up to 32 |
| Thermal Shutdown Protection | Yes |
| Short-Circuit Protection | Yes |
| ESD Protection | Yes |
Key Features
- High-speed bidirectional data communication up to 5 Mbps
- Compliance with EIA standards RS-485 and RS-422
- Independent enable/disable for driver and receiver
- Three-stated outputs when disabled
- BiCMOS technology for low power and fast switching
- Thermal shutdown protection to prevent excessive power dissipation
- Short-circuit protection
- High-Z outputs with power off
- Fail-safe feature in the receiver resulting in a logic high output state if inputs are unconnected
- Protection against ESD and latch-up
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 ADM485ARMZ?
The ADM485ARMZ supports data rates up to 5 Mbps.
- What is the supply voltage for the ADM485ARMZ?
The ADM485ARMZ operates from a single 5 V power supply.
- What is the bus common-mode range of the ADM485ARMZ?
The bus common-mode range is −7 V to +12 V.
- How many transceivers can be connected on a bus simultaneously?
Up to 32 transceivers can be connected simultaneously on a bus.
- What is the operating temperature range of the ADM485ARMZ?
The operating temperature range is −40°C to +85°C.
- Does the ADM485ARMZ have thermal shutdown protection?
Yes, the ADM485ARMZ features thermal shutdown protection to prevent excessive power dissipation.
- What type of packages is the ADM485ARMZ available in?
The ADM485ARMZ is available in 8-lead PDIP, 8-lead SOIC, and 8-lead MSOP packages.
- Does the ADM485ARMZ have ESD protection?
Yes, the ADM485ARMZ has protection against ESD.
- What happens to the receiver output if the inputs are unconnected?
The receiver output goes to a logic high state if the inputs are unconnected (floating).
- Can multiple drivers be enabled at the same time on the bus?
No, only one driver should be enabled at any time to avoid loading the bus.
