QS4A105QG8

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The QS4A105QG8 is an integrated circuit used in the field of Interface – Analog Switches, Multiplexers and Demultiplexers. It is designed with advanced BiMOS architecture and is in compliance with the CECC 70000 standard. This device has high OFF-leakage current, fast propagation delay and high CMOS output drive capability. It is available in the SOIC-16 and 0.5mm Pitch VPG package.

The QS4A105QG8 is an extremely versatile analog switch capable of being used as an analog mux, an analog demux or both. It performs two roles, firstly switching two or more analog signals and secondly, as an analog multiplexer or demultiplexer. It consists of four independently selectable SPST or two-channel K22A single-ended switches, with a total of four digital control inputs. The digital control inputs determine the analog switch settings, with one control input for each analog signal.

The QS4A105QG8 has a wide range of applications, including analog signal routing, signal isolation, signal conditioning and data acquisition systems. This IC works with source voltages of +-50V and is designed to withstand high load conditions. It can also be used in automotive and audio applications.

The working principle of the QS4A105QG8 is based on two stages: the analog mux and the analog demux. In order to understand its working principle, let us consider an example of a 2-channel K22A single-ended switching application. In this example, two digital control inputs (CI1 and CI2) are used to control the analog switch state of the circuit. The CI1 input can be applied to either of the two inputs, depending on the polarity of the digital control input. Depending on the logic state of the digital control inputs, the analog switch can either connect the two inputs or disconnect them.

In addition, the QS4A105QG8 also provides a logic output which is used to indicate the state of the analog switch. When the analog switch is in its normal state, the logic output is high; when the analog switch is in its fault state, the logic output is low. This makes the QS4A105QG8 an ideal device for protecting sensitive analog circuits from extreme temperature and voltage conditions, which would otherwise damage the circuit.

In conclusion, the QS4A105QG8 is an ideal device for analog signal routing and switching applications, providing a high level of flexibility and performance. Its versatile design allows it to be used as an analog mux, an analog demux and/or for signal isolation. Its logic output allows for the assessment of fault conditions, adding safety to the overall circuit design. All in all, this device is an invaluable asset for analog switching projects.

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