**Features of ADM2483:**
The ADM2483 is an isolated RS-485 transceiver from Analog Devices (ADI) 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 in a compact SOW-16 package. The device offers several advantages and key considerations during application:
1. **Compact Design:** Previously, we used three 6N137 optocouplers, one MAX485 transceiver, and a DC-DC isolated power supply module to achieve RS-485 isolation. Now, with the ADM2483, only one chip and a DC-DC isolated power supply are needed. Since the magnetic isolation is voltage-based, there's no need for an external current-limiting resistor. Additionally, the front end supports both 3.3V and 5V power supplies, which significantly simplifies the circuit design and improves overall performance.
*Illustration: Transmission waveform diagram when the transceiver is high and low.*
2. **Power Monitoring Function:** The ADM2483 includes a dedicated power monitoring pin labeled PV. This pin monitors the power supply voltage. If it drops below 2.0V, the pin goes low, disabling the device. When the voltage rises above 2.0V, the pin automatically goes high, enabling the transceiver. In most applications, this pin is either connected high or left floating. However, if you choose to set it high, it's recommended to use a 10kΩ pull-up resistor to prevent excessive current and potential damage. Here’s a sample circuit:
*Graphic: ADM2483 practical application circuit diagram (for reference only).*
3. **A/B Bus Terminal Protection:** Although the ADM2483 integrates an internal RS-485 transceiver with features like thermal shutdown and input failure protection, it lacks ESD protection (up to 4000V human body model). Therefore, it’s essential to add protection at the bus terminals. Based on testing, using a 6.7V TVS diode can provide ±8kV contact discharge protection, making it suitable for many basic applications.
4. **Cost Consideration:** The current USD price for the ADM2483 is around $3.00, but in local markets, it typically costs more than 10 yuan, roughly equivalent to 16 units depending on exchange rates.
**ADM2483 Application Circuit**
The ADM2483 is a differential bus transceiver designed for bidirectional data communication over multipoint bus transmission lines. It complies with ANSI TIA/EIA RS-485-A and ISO 8482:1987(E) standards. Using ADI’s iCoupler technology, the device integrates 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 requires a 5V supply.
**Typical Circuit:**
**ADM2483 Features:**
- Integrated RS-485 transceiver with electrical data isolation
- High common-mode transient immunity (>25 kV/μs)
- Thermal shutdown protection
- Low power operation (max 2.5 mA)
**Typical Application Range:**
- Isolated interface
- Building control networks
- Multi-point data transmission systems
**ADM2483 Reference Design Application Circuit:**
In summary, the ADM2483 offers a compact, reliable, and efficient solution for isolated RS-485 communication, especially in industrial and automation environments where space and performance are critical.
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