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 ADM1490EBRZ-REEL7 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.
Applications- RS-485/RS-422 interfaces
- Industrial field networks
- High data rate motor control
- Multipoint data transmission systems
- Single-ended-to-differential signal conversion
Feature
- 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
- Complies with ANSI/TIA/EIA-485-A-1998
- Open circuit fail-safe
- Suitable for 5 V power supply applications
- 32 nodes on the bus (1 unit load)
- Thermal shutdown protection
- Operating temperature range: −40°C to +85°C
- ADM1490E packagesNarrow body, 8-lead SOIC8-lead MSOP
- ADM1491E packagesNarrow-body, 14-lead SOIC10-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
(Picture: Pinout)
