QPA6489A

Series:	--
Part Status:	Discontinued at Digi-Key
Applications:	General Purpose
Output Type:	--
Number of Circuits:	1
Slew Rate:	--
Current - Supply:	75mA
Voltage - Supply, Single/Dual (±):	4.7 V ~ 5.5 V
Mounting Type:	Surface Mount
Package / Case:	TO-243AA
Supplier Device Package:	SOT-89

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QPA6489A Application Field and Working Principle

Introduction

The QPA6489A is a linear amplifier designed for use in video applications. It offers a baseband voltage gain range of 40dB to 80dB, with a maximum output current of 1.2A. The QPA6489A features a wide bandwidth of 810 MHz, making it suitable for applications requiring high-frequency operation. In addition, it has low distortion and high dynamic range, making it well-suited for applications such as video encoding and cable or satellite video transmission.

Application Field

The QPA6489A is a linear amplifier, so it is well-suited for applications requiring linear amplification of video signals. Video-based applications typically require amplifiers with low distortion and high dynamic range, and the QPA6489A is designed to meet these requirements. The QPA6489A can be used in a variety of video applications, such as video encoding and cable or satellite video transmission. It is also suitable for applications such as video-game consoles and video equipment. It is well-suited to these applications as it is capable of operating at high frequencies and provides excellent linearity. The QPA6489A can also be used in military and aerospace applications, where its excellent linearity and wide bandwidth make it ideal for use in radio and radar systems. It is also suitable for use in high-reliability environments, such as automobile and aircraft systems, where high linearity and low distortion are essential.

Working Principle

The QPA6489A is an integrated circuit (IC) consisting of two stages - an input stage and an output stage. The input stage is an inverting transimpedance amplifier (TIA) and is responsible for converting the input voltage into an equivalent current. The output stage is a voltage-controlled current source (VCCS).The input stage amplifies the input voltage by a factor of 1-2x and provides a phase shift of 180 degrees. This phase shift is necessary to ensure that the output stage of the amplifier is in phase with the input signal. The output stage then amplifies the input current by a factor of 40-80dB depending on the desired gain, and provides a constant current output. The current output of the output stage is then used to drive the load. The voltage gain of the amplifier is determined by the ratio of the output current to the input current. The gain of the amplifier can be adjusted by varying the output current using the VCCS. The QPA6489A is designed to provide low distortion and a high dynamic range. It also features a wide bandwidth of 810 MHz and low noise, making it well-suited for applications requiring high-frequency operation.

Conclusion

The QPA6489A is a linear amplifier designed for use in video applications. It features low distortion, high dynamic range, wide bandwidth, and low noise, making it suitable for use in a variety of applications. It is particularly well-suited for applications such as video encoding and cable or satellite video transmission. The QPA6489A consists of an input stage and an output stage, and the gain of the amplifier can be adjusted by varying the output current using a voltage-controlled current source.

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