ADM1491E
PRODUCTION5 V, 16 Mbps, ESD Protected, Full-Duplex RS-485 Transceiver (with Driver/Receiver Enable)
- Part Models
- 4
- 1ku List Price
- Starting From $1.75
Overview
- RS-485/RS-422 full duplex transceiver, for high speed motor control applications
- 16 Mbps data rate
- ±8 kV ESD protection on RS-485 input/output pins
- Open circuit fail-safe
- Suitable for 5 V power supply applications
- 32 nodes on the bus (1 unit load)
- See datasheet for additional features
The ADM1490E / ADM1491E are RS-485 transceivers with ±8 kV ESD protection and is suitable for high speed, full-duplex communication on multipoint transmission lines. In particular, the ADM1491E is designed for use in motor control applications requiring communications at data rates up to 16 Mbps.
The ADM1491E is designed for balanced transmission lines and complies with TIA/EIA-485-A-98. The device has a 12 kΩ receiver input impedance for unit load RS-485 operation allowing up to 32 nodes on the bus.
The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model (HBM).
The ADM1491E operates from a single 5 V power supply. Excessive power dissipation caused by bus contention or output shorting is prevented by short-circuit protection and thermal circuitry.
Short-circuit protection circuits limit the maximum output current to ±250 mA during fault conditions. A thermal shutdown circuit senses if the die temperature rises above 150°C and forces the driver outputs into a high impedance state under this condition.
The receiver of the ADM1491E contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
The ADM1491E features extremely fast and closely matched switching times. Minimal driver propagation delays permit transmission at data rates up to 16 Mbps while low skew minimizes EMI interference.
The ADM1491E is fully specified over the commercial and industrial temperature ranges and is available in two packages: a narrow-body 14-lead SOIC and a 10-lead MSOP.
APPLICATIONS
- RS-485/RS-422 interfaces
- Industrial field networks
- High data rate motor control
- Multipoint data transmission systems
- Single-ended to differential signal conversion
Documentation
Data Sheet 1
Application Note 2
Video 1
Webcast 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| ADM1491EBRMZ | 10-Lead MSOP | ||
| ADM1491EBRMZ-REEL7 | 10-Lead MSOP | ||
| ADM1491EBRZ | 14-Lead SOIC | ||
| ADM1491EBRZ-REEL7 | 14-Lead SOIC |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 30, 2017 - 15_0176 Assembly Transfer of Select 8/10L MSOP Products to Amkor Philippines |
||
| ADM1491EBRMZ | PRODUCTION | |
| ADM1491EBRMZ-REEL7 | PRODUCTION | |
|
May 15, 2012 - 10_0006 Halogen Free Material Change for mini SOIC Products |
||
| ADM1491EBRMZ | PRODUCTION | |
| ADM1491EBRMZ-REEL7 | PRODUCTION | |
|
Jul 1, 2025 - 25_0162 Gold to Copper Wire Conversion |
||
| ADM1491EBRZ | PRODUCTION | |
| ADM1491EBRZ-REEL7 | PRODUCTION | |
|
Mar 25, 2021 - 21_0080 Amkor Philippines as an Alternate Site for SOICN |
||
| ADM1491EBRZ | PRODUCTION | |
| ADM1491EBRZ-REEL7 | PRODUCTION | |
|
Oct 5, 2010 - 10_0146 Halogen Free Material Change for 14/16L SOIC_N Products |
||
| ADM1491EBRZ | PRODUCTION | |
| ADM1491EBRZ-REEL7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Evaluation Kits
Standard RS-485 Full-Duplex (14-lead SOIC) Evaluation Board, EVAL-RS485FDEBZ