Half-Duplex iCoupler Isolated RS-485 Transceiver ADM24

The ADM2481 differential bus transceiver is a comprehensive, electrically isolated component designed for data bidirectional balanced, multipoint bus transmission line communications. It complies with ANSI and ISO 8482 EIA/TIA-485-A 1987(e). Utilizing ADI's iCoupler® technology, the company's ADM2481 combines a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package. The device is powered with either a 5 V or 3 V supply on the logic side, and the bus side uses a 5 V supply only.

The slew rate limited control data rate is 500 kbps. The input impedance of the device is 96kΩ, allowing up to 256 bus transceivers. Its drivers have an active high enable function. The driver differential outputs and receiver differential inputs are internally connected to form a differential I/O port. When the driver is disabled or when VDD1 or VDD2 = 0 V, this provides a minimum load on the bus. The active high receive disable function, which causes the receiver outputs to enter a high impedance state, provides a good.

The receiver inputs feature a true fail-safe feature that ensures a logic high receiver output level when the inputs are open or shorted. This ensures that the receiver outputs are in a known state before communication begins and at the communication point when it ends.

Current limit and thermal shutdown protect against output short circuits and bus contention situations that could cause excessive power dissipation. The device is fully specified over the -40°C to +85°C industrial temperature range and is available in a 16-lead wide-body SOIC package.

application

Low power consumption RS-485/RS-422 network

Isolation interface

Control network construction

Multi-point data transmission system

characteristic

RS-485 transmit and receive data isolation circuit

Compliant with ANSI and ISO 8482 TIA/EIA-485-A:1987(Eastern)

500 kbps data rate

Slew rate limited driver output

Low power operation: 2.5 mA maximum

Suitable for 5 V or 3.3 V operation (VDD1)

High common mode transient immunity: > 25 kV/µs

See datasheet for additional features