ADM2483BRW

The ADM2483 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on balanced, multipoint bus transmission lines. It complies with ANSI EIA/TIA-485-A and ISO 8482: 1987(E). Using Analog Devices' i Coupler technology, the ADM2483 combines a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package. The logic side of the device is powered with either a 5 V or 3 V supply, and the bus side uses a 5 V supply only.

The ADM2483 is slew-limited to reduce reflections with improperly terminated transmission lines. The controlled slew rate limits the data rate to 500 kbps. The device's input impedance is 96 kΩ, allowing up to 256 transceivers on the bus. Its driver has an active-high enable feature. The driver differential outputs

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RS-485 transceiver with electrical data isolation

Complies with ANSI TIA/EIA RS-485-A and ISO 8482: 1987(E) 500 kbps data rate Slew rate-limited driver outputs Low power operation: 2.5 mA max Suitable for 5 V or 3 V operations (VDD1) High common-mode transient immunity: >25 kV/μs True fail-safe receiver inputs Chatter-free power-up/power-down protection 256 nodes on bus Thermal shutdown protection Safety and regulatory approvals UL recognition: 2500 Vrms for 1 minute per UL 1577 CSA Component Acceptance Notice #5A VDE Certificate of Conformity DIN EN 60747-5-2 (VDE 0884 Rev. 2): 2003-01 DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000 VIORM = 560 V peak

Operating temperature range: -40°C to +85°C

Low power RS-485/RS-422 networks Isolated interfaces Building control networks

Multipoint data transmission systems

04736-002

Figure 2. Pin Configuration

Table 8. Pin Function Descriptions

TA = 25°C, unless otherwise noted. All voltages are relative to their respective ground.

The ADM2483 contains thermal shutdown circuitry that protects the part from excessive power dissipation during fault conditions. Shorting the driver outputs to a low impedance source can result in high driver currents. The thermal sensing circuitry detects the increase in die temperature under this condition and disables the driver outputs. This circuitry is designed to disable the driver outputs when a die temperature of 150°C is reached. As the device cools, the drivers are re-enabled at a temperature of 140°C.