**Features of ADM2483:**
The ADM2483 is an isolated RS-485 transceiver from Analog Devices that integrates the company’s patented iCoupler isolation technology. This technology effectively replaces three single-channel optocouplers and a standard RS-485 transceiver operating at 500 kbps, all within a compact SOW-16 package. It offers several advantages and important considerations in practical applications.
One key advantage is its small size. Previously, we used three 6N137 optocouplers, one MAX485 transceiver, and a DC-DC isolated power supply module to achieve RS-485 isolation. Now, with just one ADM2483 and a DC-DC isolated power supply, the design becomes much simpler. The magnetic isolation technology used in the ADM2483 is voltage-based, eliminating the need for external current-limiting resistors. Additionally, it supports both 3.3V and 5V power supplies on the front end, which significantly reduces circuit complexity and improves overall performance.
*Transmission waveform diagram when the transceiver is high or low.*
Another notable feature is its built-in power monitoring function. The ADM2483 includes a PV pin for power supply monitoring. When the supply voltage drops below 2.0V, this pin goes low, preventing the device from operating. Once the voltage rises above 2.0V, the pin automatically goes high, allowing the ADM2483 to function normally. In practice, this pin is often left floating or pulled up with a 10kΩ resistor to avoid excessive current and potential damage. Here's an example of the actual circuit:
*Power monitoring circuit for ADM2483.*
The ADM2483 also features integrated A and B bus terminals with internal RS-485 transceivers, thermal shutdown protection, and input failure protection. However, it does not include ESD protection (up to 4,000V human body model). Therefore, it is recommended to add a TVS diode on the bus side. Based on testing, adding a 6.7V TVS can provide protection up to ±8kV contact discharge, which is sufficient for many basic applications.
In terms of cost, the ADM2483 is currently priced around $3.00 in the US, but in some local markets, it may cost more than 10 yuan, making it approximately 16 units per piece.
**ADM2483 Application Circuit**
The ADM2483 differential bus transceiver is a fully integrated galvanic isolation solution for bidirectional data communication over multipoint bus transmission lines. It is designed for balanced transmission lines and complies with ANSI TIA/EIA RS-485-A and ISO 8482:1987(E) standards. The device uses iCoupler technology to integrate three-channel isolators, tri-state differential line drivers, and differential input receivers into a single package. The logic side can be powered by either 5V or 3V, while the bus terminal operates at 5V.
Here is a typical application circuit:
**Key Features of ADM2483:**
- Integrated RS-485 transceiver with electrical isolation
- High common-mode transient immunity (over 25 kV/μs)
- Thermal shutdown protection
- Low power consumption (max 2.5 mA)
**Typical Application Areas:**
- Isolated interfaces
- Building control networks
- Multi-point data transmission systems
For reference, here is a sample reference design application circuit:
Brake Disc For NISSAN
Nissan Brake Disc,Nissan Auto Brake Disc,Nissan Car Brake Disc,Nissan Automobile Brake Disc
Zhoushan Shenying Filter Manufacture Co., Ltd. , https://www.renkenfilter.com