Update: 30 September, 2023
ZXFV4089 is a low-distortion video amplifier and DC restoration circuit. It is specially designed to provide brightness level stability as a 'black-level clamp' in video systems with very low distortion and low power consumption. A high fidelity video amplifier is combined with a sample-hold switch circuit using an external coupling capacitor to provide level-shifting of the video output such that a time-gated sample of the waveform is set to be equal to an external reference voltage (usually zero voltage). A buffered TTL/CMOS logic input signal controls the switch. The gain is set externally by two resistors. In a typical application, the sample-hold circuit is gated on during part of the back-porch interval of an analog video waveform. Then the video waveform is stabilised for the remainder of the line-scan interval.
File format: PDF
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MD5 Checksum: 9F638D1EAD327192CAE30AAC647DD206
Publication date: 11 April, 2012
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PDF Link: ZETEX ZXFV4089 Manual PDF