AD812ANZ

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AD812ANZ Application Field and Working Principle

The AD812ANZ is a high-speed, voltage feedback amplifier designed specifically for applications requiring low noise performance, wide bandwidth and excellent differential linearity. It is optimized for use in video applications, such as video line amplifiers and drivers, where picture sharpness and distortion reduction is critical. The wide bandwidth, flat gain and high slew rate (200V/?s typical) capabilities of the AD812ANZ make it an ideal amplifier for high performance imaging systems. It is particularly suited to wide bandwidth images and line amplifiers.

Application Field

The AD812ANZ is primarily used as a video line amplifier for imaging systems. It features excellent common-mode and gain linearity, very low distortion, wide bandwidth, and fast settling time. It is ideal for all video applications that require high performance, such as switched and adaptive matrix systems, post-processing of digital video, and new image and video encoding applications. Other possible applications include active filters, audio processing, high speed servo and control loops, and high frequency sample-and-hold circuits.

Working Principle

The AD812ANZ is a two-stage, differential line driver amplifier. The amplifier’s differential input section provides input isolation and common-mode rejection. The amplifier is configured with a low output impedance, which reduces the effects of crosstalk between outputs. The negative feedback employed in the second stage reduces distortion and improves linearity at low levels. The amplifier also has an internal output gain element, which provides very flat gain over a wide bandwidth. This element is also used to adjust the voltage gain, which is adjustable to the user’s desired setting. The output stage features an additional gain element, which is used to improve power supply rejection ratio (PSRR) and to reduce output noise. The fast settling time of the amplifier makes it suitable for high speed imaging applications, as well as for high frequency sample-and-hold circuits.

In summary, the AD812ANZ is a high-speed, voltage feedback amplifier designed for video line driver applications. It provides excellent common-mode and gain linearity, low distortion, wide bandwidth, and fast settling time, making it an ideal amplifier for imaging systems, switched and adaptive matrix systems, digital video post-processing, and new image and video encoding applications.

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