MAX14932CASE+T

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Digital isolators provide a secure method of electrical isolation between two or more electrical circuits while allowing them to communicate with each other. The MAX14932CASE+T application is an example of a digital isolator that uses capacitive coupling to transfer a digital signal across an isolation barrier. This application provides a robust, low-cost solution for isolating DC power, digital signals, and BLE communication between two ends of a system.

The MAX14932CASE+T Application uses a number of different components in order to comply with both AC and DC requirements. It includes a dual-channel, digital isolator, which is powered by a 50 V AC or +24 V DC input. This digital isolator has an isolation voltage of 2500 VRMS and provides differential data transmission over a 6.25 Mbps cable. The digital isolator is also capable of providing coupling and transient protection up to 16 kV/μs. In addition to the digital isolator, the MAX14932CASE+T Application also includes an optional bridge rectifier, two transformers, and two optocouplers.

The bridge rectifier is used to convert the AC signal coming in to a DC signal. The two transformers are used to provide galvanic isolation to the input and output, respectively. Both of these components are rated to withstand a maximum peak current of 1.2 A. The optocouplers are used to provide level shifting between the input and output. The first optocoupler is used to convert the digital input signal from TTL/LVTTL/CMOS levels to the CMOS levels the digital isolator requires. The second optocoupler is used to convert the output signal from the digital isolator back to the TTL/LVTTL/CMOS levels.

The MAX14932CASE+T application also includes a DC-DC converter to power the digital isolator. This DC-DC converter provides up to 5 V and 200 mA of output current to the digital isolator. Additionally, it includes a bias input (Vbias) and a power enable signal (EN). These two signals can be used to enable/disable the power supply for the digital isolator as needed.

The MAX14932CASE+T application provides a robust isolation solution for a wide range of applications. It is particularly well suited for isolating DC power, digital signals, and BLE connectivity across two ends of a system in medical, industrial, and other high-reliability applications. Its use of capacitive coupling provides a secure isolation barrier, while its optocouplers enable low-power, level-shifting between the input and output. Furthermore, the inclusion of two optocouplers and a bridge rectifier make it a low-cost solution for digital isolation.

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