5/10pcs ADUM1201 Magnetic Isolator Board Module Replace …, Mandai

ADUM1201 dual-channel digital magnetic isolator replaces optocoupler


Because it is based on iCoupler technology, ADUM1201 has many advantages over optocouplers:


Higher speed, the rate can reach 125Mbps.


Lower power consumption, the power consumption is less than 1/10 of the traditional optocoupler at the same data transmission rate, and the minimum operating current is 0.8mA.


Higher performance, timing accuracy, transient common mode suppression, and channel matching are better than traditional optocouplers.


Smaller size and higher integration, the printed circuit board (PCB) area is 40% of the traditional optocoupler.


More flexible application. Unlike traditional optocouplers, multi-channel iCoupler digital isolators can provide forward and reverse communication channels in the same chip.


The two ends isolated by ADUM1201 have their own power supply and reference ground, and the power supply voltage range is between 2.7V and 5.5V, which can achieve low-voltage power supply, thereby further reducing system power consumption. A 0.01μF to 0.1μF capacitor needs to be connected between the power supply and the reference ground to filter out high-frequency interference. The distance between the capacitor and the power supply should be within 20mm, so that a better filtering effect can be achieved. Since the two isolation channels are highly matched, the crosstalk between the channels is very small, and the two-channel input and output reverse design is adopted, which is very suitable for the bidirectional transmission and reception characteristics of the RS232 bus, greatly simplifying the hardware connection between the isolator and the isolated ends. It should be noted that GND1 and GND2 are two different reference grounds, otherwise the isolation effect will not be achieved.


It should also be noted that when ADUM1201 is working normally, the power supplies at both ends need to be powered on at the same time to ensure that both channels of ADUM1201 can work normally. If one is not powered on, the entire chip will not work properly.