Overview
The ADM3491AR, produced by Analog Devices Inc., is a low-power differential line transceiver designed to operate using a single +3.3 V power supply. This component is ideal for power-sensitive applications due to its low power consumption and shutdown mode. It is compliant with both EIA RS-485 and RS-422 standards, making it suitable for balanced data transmission on multipoint bus transmission lines. The ADM3491AR is fabricated using BiCMOS technology, combining the benefits of low-power CMOS and fast-switching bipolar technology.
Key Specifications
| Specification | Value |
|---|---|
| Power Supply | 3.3 V ± 0.3 V |
| Data Rate | Up to 20 Mbps |
| Supply Current | 840 μA |
| Shutdown Current | 2 nA |
| Input Impedance | 19 kΩ |
| Number of Transceivers on Bus | Up to 50 |
| Short-Circuit Protection | Yes |
| Thermal Shutdown | Yes |
| Package Types | PDIP, SOIC, TSSOP |
| ESD Protection | Meets IEC1000-4-4 (>1 kV) |
Key Features
- Operates with a single 3.3 V power supply
- EIA RS-422 and RS-485 compliant over full common-mode range
- Low power consumption with a shutdown mode
- Up to 20 Mbps data rate
- Short-circuit protection and thermal shutdown
- Fail-safe receiver output in case of unconnected inputs
- Available in PDIP, SOIC, and TSSOP packages
Applications
- Telecommunications: DTE–DCE interface, packet switching
- Local area networks
- Data concentration and data multiplexers
- Integrated services digital network (ISDN)
- AppleTalk
- Industrial controls
Q & A
- What is the power supply voltage for the ADM3491AR?
The ADM3491AR operates with a single 3.3 V power supply. - What are the data rates supported by the ADM3491AR?
The ADM3491AR supports data rates up to 20 Mbps. - How many transceivers can be connected on the bus?
Up to 50 transceivers can be connected on the bus. - Does the ADM3491AR have short-circuit protection?
Yes, the ADM3491AR has short-circuit protection. - What is the input impedance of the ADM3491AR?
The input impedance is 19 kΩ. - What are the package types available for the ADM3491AR?
The ADM3491AR is available in PDIP, SOIC, and TSSOP packages. - Does the ADM3491AR have thermal shutdown?
Yes, the ADM3491AR has thermal shutdown. - What is the shutdown current of the ADM3491AR?
The shutdown current is 2 nA. - Is the ADM3491AR compliant with EIA RS-485 and RS-422 standards?
Yes, the ADM3491AR is compliant with both EIA RS-485 and RS-422 standards. - What are some typical applications of the ADM3491AR?
The ADM3491AR is used in telecommunications, local area networks, data concentration, ISDN, AppleTalk, and industrial controls.
