ISO7721FDR Isolators

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Digital isolators provide a way of safety to electronic systems that transfer data bidirectionally across the isolation barrier. In this article, the focus will be on one digital isolator, the ISO7721FDR, and its application field and working principle.

The ISO7721FDR digital isolator utilizes transmitter and receiver integrated circuits that allow digital signals to be transferred between two isolated circuits at data rates up to 500 kbps. This isolator is also used for wide-range temperature operation so it can be used for industrial and automotive applications needing reliable data transmission.

The primary purpose of the ISO7721FDR isolator is to ensure that data is not corrupted by EMI/RFI interference or by voltage transients on the input side of the isolator. It provides galvanic isolation between two systems or between two nodes in a network. It also reduces extraneous electrical noise, electrostatic discharge (ESD), electrical transients, and ground loop noise.

The application field of the ISO7721FDR includes the process control, telecom, automotive, medical and instrumentation industries. In the process control industry, the use of the isolator helps to protect the system from transients, grounding, and magnetic disturbances. The telecom industry uses the isolator for powerline communications and telephony. In the automotive industry, the isolator is used for safety critical applications such as brake control systems. It is also used in medical devices for safety and in instrumentation systems for data logging and telemetry.

The ISO7721FDR digital isolator works on the principle of capacitive coupling between its transmitter IC and receiver IC. The transmission and reception of signals is done by an alternating current-modulated digital signal waveform. The isolation barrier is formed by the coupling capacitor, which is an electrostatic barrier that isolates the signal from electromagnetic interference.

The internal capacitance of the input side of the isolator creates the high voltage isolation between the input and output side of the isolator. This capacitance is created by the electrostatic field generated by the AC modulated signal. The receiver IC is also insulated from the transmission IC by an on-chip capacitor and decoupling capacitors.

The high voltage isolated output of the ISO7721FDR is also galvanically isolated from the input side of the isolator. This means that the output of the isolator is immune to EMI/RFI disturbances and voltage transients. The signal on the output side of the isolator is clean and free from noise and distortion.

In conclusion, the ISO7721FDR is a digital isolator that utilises capacitive coupling and on-chip capacitors to provide high voltage isolation between two circuits or nodes in a network. It is used to protect against EMI/RFI interference and voltage transients and is suitable for use in a range of industries including process control, telecom, automotive, medical, and instrumentation.

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