ISO721MDRG4

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Digital isolators are electronic devices used to transfer digital or analog signals between two remote circuits. They provide galvanic isolation by creating a barrier between the transmitting and receiving circuits. They are also used to reduce high voltage levels, isolate circuits from electromagnetic interference (EMI), and minimize ground potential differences.

The ISO721MDRG4 is one type of digital isolator. An on-chip transformer is used to provide a complete isolation solution that eliminates the need for external components such as isolation capacitors, transformers, or optocouplers. It is compliant with the USB-IF standard for Hi-Speed data isolation and meets the IEC 61147 requirements for insulation rating and creepage/clearance.

The ISO721MDRG4 features an 8-bit logic interface with data rate up to 4Mbps and a 3.3V CMOS compatibility. The signal transmission occurs through differential across the transformer, providing a high degree of noise immunity and high common-mode transient immunity. The device also includes a power-on reset circuit for the power supply. This ensures that all digital isolators maintain their same off-state and on-state signal levels when powered on.

The ISO721MDRG4 is designed for many applications, including motor drives, industrial automation, USB-IF data applications, and communication systems. It is also suitable for automotive and medical systems with the excellent noise immunity and multiple EMC standards. In motor drives, it is useful to isolate the low-voltage and safety logic signals from the high-voltage and possibly hazardous power control signals. In industrial automation, the device can be used to isolate fieldbus signals from a control network. It is also capable of isolating USB-IF data signals from a digital data bus, allowing for a simpler, more reliable, and more secure data communication.

In terms of working principle, the ISO721MDRG4 uses transformer coupled digital isolation to create an electrical barrier between two isolated circuitry domains. It receives the input data signal as a differential voltage swing at the primary side winding, and uses an on-chip transformer to transfer the input data to the secondary side of the device. After the signal is amplified by an internal amplifier, it is converted into digital logic levels and then transmitted through an output buffer to the secondary side circuitry.

The ISO721MDRG4 is a highly versatile device that is used in a variety of applications. It is designed to provide a complete digital isolation solution with a high degree of noise immunity and excellent EMC conformance. It is well suited for applications requiring tight isolation performance and cost-effectiveness.

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