ACPL-5700L

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Optoisolators - Transistor, Photovoltaic Output, are devices that provide electrical isolation between two circuits. The ACPL-5700L is a highly integrated optoisolator for digital signal interconnect applications. To break the electrical connection between systems, it incorporates two galvanic isolators, a galvanic insulation resistor, and a power circuit. It is designed to provide very low power consumption, high and fast switching speed, and excellent linearity. In this article, we will discuss the ACPL-5700L\'s application field and its working principles.

The ACPL-5700L is used in various digital circuit applications, including digital signal processing (DSP), measurement, and communication. It is also applicable in medical and industrial instrumentation, as well as in automotive and data communication electronics. This optoisolator caters to a wide range of signal widths, up to a maximum of 32 bits. The short propagation delays and increased speed of switching make the device suitable for a variety of high-speed applications.

How does the ACPL-5700L work? The device consists of a photoreceiver IC and two optically isolated optical receivers and a power circuit. The optically isolated optical receivers are composed of an infrared LED, a photodiode, and a current-mode modulator. The LED emits light of a certain wavelength, which is then detected by the photodiode and converted into current. This current is then modulated by the current-mode modulator and finally transmitted through the power circuit. The power circuit consists of a power transistor, a resistor, and a capacitor. The transistor allows the current to flow, and the capacitor driving the resistor maintains the current at a constant level. This in turn results in a consistent output.

Next, the modulated current is transmitted to the photoreceiver IC, which consists of two stages. In the first stage, the modulated current is amplified and converted into a voltage signal. In the second stage, the voltage signal is further amplified and digitally conditioned according to the application. The optocoupler then converts the output voltage into a logic level signal, and the final digital output is obtained. The differentiating feature of the ACPL-5700L is its ability to convert digital signals up to 32 bits. This makes it suitable for a variety of signal conditioning applications such as data transmission, communication, and measurement.

The ACPL-5700L optoisolator is designed to provide electrical isolation between two systems. By breaking the electrical connection, it prevents the transmission of common mode noise and static electricity, which can cause interference in sensitive electrical devices. Additionally, it provides a high-speed switching response and superior linearity while consuming very low power. Owing to its high performance and versatility, the ACPL-5700L has found applications in numerous digital circuits and signal conditioning systems.

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