ADA4411-3ARQZ-RL

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ADA4411-3ARQZ-RL Application Field and Working Principle

The ADA4411-3ARQZ-RL is a wideband, video amplifier module designed for use in broadcast video applications and professional video systems. This video amplifier can be used for video signal amplification from a wide temperature and supply voltage range, as well as a very low overall power dissipation. The ADA4411-3ARQZ-RL is suitable for use in applications such as LCD displays and digital set-top boxes.

The ADA4411-3ARQZ-RL employs three general-purpose differential input stages, each with a PowerFET input protection. This protection helps reduce the risk of overloading the active device with a large, sustained output signal. Each input stage is followed by a fixed, feedback-compensated transconductance stage featuring an output current monitor. Such compensation ensures wide-bandwidth performance.

The ADA4411-3ARQZ-RL employs a fixed gain of 8 dB, and includes a voltage-controlled gain adjustment input (VCTL) to permit gain control. The output enables disabling of the output current when the VCTL is set to a negative voltage, and the protection features of the PowerFETs guarded against excessive output current.

The PowerFET inputs minimizes the risk of overloading the active device with a large, sustained output signal and reduces power dissipation, making the ADA4411-3ARQZ-RL suitable for professional video applications, as well as for use in LCD displays and digital set-top boxes.

The working principle of ADA4411-3ARQZ-RL can be summarized as follows. The device operates some up to a supply voltage of 5.5V and has an overall power dissipation of 0.5 W during operation. The ADA4411-3ARQZ-RL is suitable for professional video signals where three main stagescan be identified. These are the differential input stage, the feedback-compensated transconductance (FCT) stage and the output stage. The differential input stage offers input protection by way of PowerFETs, and the output stage can be disabled with a negative voltage on the VCTL input.

The FCT stage is an integrated circuit that works on the principle of transconductance. Transconductance is determined by the amount of current flowing from the input to the output of an amplifier. The FCT stage provides a fixed, feedback-compensated transconductance which ensures a wide-bandwidth performance. When combined with the output stage, the ADA4411-3ARQZ-RL provides amplification for video signals up to 8 dB of gain.

The ADA4411-3ARQZ-RL module is a wideband, video amplifier designed for use in broadcast video applications and professional video systems. With its wide temperature and supply voltage range, as well as very low overall power dissipation, the ADA4411-3ARQZ-RL is the perfect choice in applications such as LCD displays and digital set-top boxes. The low dissipation of this amplifier module helps to reduce the risk of overloading the active device with large, sustained output signals, and the fixed, feedback-compensated transconductance stage provides wide-bandwidth performance. Additionally, the ADA4411-3ARQZ-RL is capable of providing up to 8 dB of amplification for video signals.

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