The ADUM-1201 is a digital isolator designed to provide galvanic isolation between two circuits. It ensures safe data transmission by electrically isolating the input and output sides, preventing high voltages or noise from affecting sensitive low-voltage circuits. This component is based on Analog Devices' iCoupler® technology, which uses micro-transformers to achieve high-speed, reliable isolation.
Parameter | Value |
---|---|
Isolation Voltage | 2.5 kV RMS |
Data Rate | Up to 25 Mbps |
Supply Voltage (VDD1/VDD2) | 2.7 V to 5.5 V |
Propagation Delay | 50 ns (typical) |
Common-Mode Transient | >25 kV/µs |
Operating Temperature | -40°C to +125°C |
Channels | 2 (unidirectional or bidirectional) |
Package | 8-lead SOIC (Small Outline Integrated Circuit) |
The ADUM-1201 is available in an 8-lead SOIC package. Below is the pinout and description:
Pin Number | Pin Name | Description |
---|---|---|
1 | VDD1 | Power supply for side 1 (input side) |
2 | GND1 | Ground for side 1 |
3 | A1 | Input signal for channel 1 |
4 | A2 | Input signal for channel 2 |
5 | B2 | Output signal for channel 2 |
6 | B1 | Output signal for channel 1 |
7 | GND2 | Ground for side 2 |
8 | VDD2 | Power supply for side 2 (output side) |
The ADUM-1201 can be used to isolate communication signals between an Arduino UNO and another device. Below is an example of isolating a digital signal:
// Example code to send a digital signal through the ADUM-1201 isolator
const int outputPin = 2; // Arduino pin connected to A1 on ADUM-1201
void setup() {
pinMode(outputPin, OUTPUT); // Set the pin as an output
}
void loop() {
digitalWrite(outputPin, HIGH); // Send a HIGH signal
delay(1000); // Wait for 1 second
digitalWrite(outputPin, LOW); // Send a LOW signal
delay(1000); // Wait for 1 second
}
No Output Signal on B1/B2:
Signal Distortion or Noise:
Component Overheating:
Loss of Isolation:
Q: Can the ADUM-1201 be used for bidirectional communication?
A: No, the ADUM-1201 is designed for unidirectional communication. For bidirectional communication, consider using other models in the ADuM series that support bidirectional channels.
Q: What happens if the data rate exceeds 25 Mbps?
A: Exceeding the maximum data rate may result in signal distortion, increased propagation delay, or data loss.
Q: Can I use a single power supply for both sides?
A: No, separate power supplies are required for VDD1 and VDD2 to maintain galvanic isolation.
Q: How do I ensure long-term reliability of the isolation barrier?
A: Operate the component within its specified voltage, temperature, and environmental limits. Avoid exposure to high humidity or contaminants.