CNX39UW

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Optoisolators are used in many applications to provide electrical isolation between two circuits. The CNX39UW is a particularly versatile optoisolator featuring a transistor, photovoltaic output. This article provides an overview of this device’s application field and working principle.

Application Field

The CNX39UW is used in isolation applications that require switching to take place in response to either a low or high logic level input. This optoisolator is specifically designed for use in analog to digital converter (ADC) circuits, where it is used to switch between two different input voltages. It is also frequently used in digital signal processors (DSPs) and in high speed logic circuits. This optoisolator can be used to improve signal isolation and minimize the potential for ground noise to cause errors.

Working Principle

The heart of the CNX39UW is a pair of matched photodiodes, each connected to a common photovoltaic collector. When the optoisolator is subjected to forward bias, a flow of photocurrent is created between the photodiodes and the collector. The collector then acts as an output source, powering a corresponding load circuit. This load circuit typically consists of a transistor that acts as a switchable load, switching from low-voltage to high-voltage output for a given input signal.

The photodiodes of the CNX39UW provide an extremely sensitive response to input light, allowing it to easily detect even low-voltage signals. This makes the device an ideal choice for applications such as data acquisition systems and precision analog-to-digital conversion. Additionally, the low level of leakage current and low voltage drop provided by this optoisolator make it well suited for applications that require a high degree of accuracy.

A further advantage of the CNX39UW is its ability to operate at higher voltages than normal optoisolators. The device can operate at up to 40V, which makes it well suited for applications that require higher voltages or power levels.

The CNX39UW is also notable for the low power consumption that it requires. The device will typically consume less than 180mW, making it highly efficient for applications where power consumption must be kept to a minimum.

Conclusion

The CNX39UW provides a highly versatile optoisolator featuring a transistor and photovoltaic output. It is ideal for applications that require switching between two different input voltages, such as data acquisition systems and precision analog-to-digital conversion. Further advantages of this device include a high level of signal sensitivity, low leakage current, low voltage drop, and the ability to operate at higher voltages and consume less power.

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