The ADM1490E/ADM1491E are RS-485/RS-422 transceivers with ±8 kV ESD protection and are suitable for high speed, full-duplex communication on multipoint transmission lines. In particular, the ADM1490E/ADM1491E are designed for use in motor control applications requiring communications at data rates up to 16 Mbps. Applications
The ADM1490E/ADM1491E are designed for balanced transmission lines and comply with TIA/EIA-485-A-98. The devices each have 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 ADM1490E/ADM1491E operate 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 ADM1490E/ADM1491E contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating). The ADM1490E/ADM1491E feature extremely fast and closely matched switching times. Minimal driver propagation delays permit transmission at data rates up to 16 Mbps, and low skew minimizes EMI interference.
The ADM1490E/ADM1491E are fully specified over the commercial and industrial temperature ranges. The ADM1490E is available in two packages: a narrow body, 8-lead SOIC and an 8-lead MSOP. The ADM1491E is also available in two packages: a narrow body, 14-lead SOIC and a 10-lead MSOP.
Features and Benefits
| Interface & Isolation |
| Document | note |
| ADM1490E/ADM1491E: 16 Mbps, ESD Protected, Full-Duplex RS-485 Transceivers Data Sheet (Rev. D) | PDF 335 kB |
| Document | note |
| AN-1176: Component Footprints and Symbols in the Binary .Bxl File Format (Rev. 0) | PDF 671 kB |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| ADM1490EBRMZ Production | 8 ld MSOP | OTH 50 | -40 to 85C | 1.41 | 1.2 | Y |
| ADM1490EBRMZ-REEL7 Production | 8 ld MSOP | REEL 1000 | -40 to 85C | 0 | 1.2 | Y |
| ADM1490EBRZ Production | 8 ld SOIC | OTH 98 | -40 to 85C | 1.35 | 1.15 | Y |
| ADM1490EBRZ-REEL7 Production | 8 ld SOIC | REEL 1000 | -40 to 85C | 0 | 1.15 | Y |
| Part Number | Description | Price | RoHS |
|---|---|---|---|
| EVAL-RS485FD8EBZ | Evaluation Board | 30 | Y |
