Overview
The ADM485AR, 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 device operates from a single 5 V power supply and features low power consumption, high speed, and thermal shutdown protection. It is fabricated using BiCMOS technology, combining the benefits of low power CMOS and fast switching bipolar technology.
Key Specifications
| Parameter | Value |
|---|---|
| Package/Case | 8-SOIC (0.154", 3.90mm Width) |
| Number of Drivers/Receivers | 1/1 |
| Data Rate | 5 Mbps |
| Supply Voltage | 4.75 V to 5.25 V |
| Operating Temperature | -40°C to +85°C |
| Mounting Type | Surface Mount |
| Receiver Hysteresis | 70 mV |
| Driver Propagation Delay | 10 ns typical |
| Receiver Propagation Delay | 15 ns typical |
| Output Type | 3-State |
| Operating Supply Current | 2.2 mA |
Key Features
- Meets EIA RS-485 and RS-422 standards
- High speed data rate of 5 Mbps
- Single 5 V power supply
- Low power consumption
- Thermal shutdown protection and short-circuit protection
- High-Z outputs when power is off or driver is disabled
- Fail-safe receiver feature ensuring a logic high output state if inputs are unconnected
- ESD protection on all inputs and outputs
- BiCMOS technology for fast switching and low power
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 ADM485AR used for?
The ADM485AR is used for high-speed bidirectional data communication on multipoint bus transmission lines, complying with EIA standards RS-485 and RS-422.
- What is the operating voltage of the ADM485AR?
The ADM485AR operates from a single 5 V power supply, with a voltage range of 4.75 V to 5.25 V.
- What is the maximum data rate of the ADM485AR?
The maximum data rate of the ADM485AR is 5 Mbps.
- What kind of protection does the ADM485AR have?
The ADM485AR features thermal shutdown protection, short-circuit protection, and 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 is the receiver hysteresis of the ADM485AR?
The receiver hysteresis of the ADM485AR is 70 mV.
- What is the propagation delay of the driver and receiver?
The driver propagation delay is 10 ns typical, and the receiver propagation delay is 15 ns typical.
- Does the ADM485AR have fail-safe features?
Yes, the ADM485AR has a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
- What is the operating temperature range of the ADM485AR?
The operating temperature range of the ADM485AR is -40°C to +85°C.
- What is the package type of the ADM485AR?
The ADM485AR comes in an 8-SOIC package.
