ADM2483 Reference Design Circuit | Differential Bus Transceiver Application Circuit

The ADM2483 differential bus transceiver is an integrated galvanic isolation device for bidirectional data communication on multipoint bus transmission lines. This article mainly introduces the ADM2483 features, application range, reference design circuit and circuit analysis to help you shorten the design time.

ADM2483 features: RS-485 transceiver with integrated electrical data isolation; high common mode transient immunity: >25kV/μs; thermal shutdown protection; low power operation: 2.5mA maximum

Typical application range of ADM2483: isolated interface; building control network; multi-point data transmission system

ADM2483 reference design application circuit:

Figure 1ADM2483 internal structure diagram

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.

Figure 2ADM2483 reference design

The ADM2483 requires isolated power capable of 5 V at 100 mA to be supplied between the VDD2 and GND2 pins. If no suitable integrated power supply is available, a discrete circuit, such as the one in Figure 30, can be used. A center-tapped Transformer provides electrical isolation.

ADM2483 Chinese Data Sheet: Click to download

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