Overview
The ADM488AR, produced by Analog Devices Inc., is a low power, full-duplex differential line 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 features a single differential line driver and a single differential line receiver, enabling full-duplex data transfer. It operates from a single 5 V ± 10% power supply and is fabricated using BiCMOS technology, combining the benefits of low power CMOS with fast switching bipolar technology.
Key Specifications
| Parameter | Value |
|---|---|
| Data Rate | Up to 250 kbps |
| Supply Voltage | 5 V ± 10% |
| Operating Temperature Range | -40°C to +85°C |
| Input Impedance | 12 kΩ |
| Bus Common-Mode Range | -7 V to +12 V |
| Supply Current | 30 μA |
| Protection Features | 2 kV EFT protection, thermal shutdown, short-circuit protection |
| Package Types | PDIP, SOIC, TSSOP |
Key Features
- Compliance with EIA RS-485 and RS-422 standards
- Full-duplex operation with a single differential line driver and receiver
- Low power consumption with a supply current of 30 μA
- High electromagnetic immunity and reduced EM interference due to slew rate limited drivers
- Fail-safe feature that results in a logic high output state if inputs are unconnected (floating)
- Thermal shutdown circuit to prevent excessive power dissipation during fault conditions
- Short-circuit protection and 2 kV EFT protection
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)
Q & A
- What are the main standards that the ADM488AR complies with?
The ADM488AR complies with both EIA RS-485 and RS-422 standards.
- What is the maximum data rate supported by the ADM488AR?
The ADM488AR supports data rates up to 250 kbps.
- What is the operating temperature range of the ADM488AR?
The operating temperature range is -40°C to +85°C.
- What type of protection features does the ADM488AR have?
The ADM488AR features 2 kV EFT protection, thermal shutdown, and short-circuit protection.
- What is the input impedance of the ADM488AR?
The input impedance is 12 kΩ, allowing up to 32 transceivers on the differential bus.
- What is the supply voltage and current of the ADM488AR?
The supply voltage is 5 V ± 10%, and the supply current is 30 μA.
- What are the package types available for the ADM488AR?
The ADM488AR is available in PDIP, SOIC, and TSSOP packages.
- Does the ADM488AR 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 significance of the slew rate limited drivers in the ADM488AR?
The slew rate limited drivers reduce electromagnetic emissions, minimizing both conducted and radiated interference.
- What are some typical applications of the ADM488AR?
Typical applications include low power RS-485 and RS-422 systems, DTE-DCE interfaces, packet switching, local area networks, data concentration, data multiplexers, and ISDN.
