CXD2018AQ

The CXD2018AQ is a vertical deflection processing IC compatible with multi-standard TV systems.The CXD2018AQ is a vertical deflection processing IC compatible with multi-standard TV systems.This device basically consists of two different functional sections: countdown processor (CDP) and digital signal processor (DSP), which are respectively controlled through software.The CDP, by performing complex processing under the control of software, yields excellent synchronized stability performance to signals that contain a great deal of noise or that are missing a synchronizing component.

The CXD2018AQ has the following features include:(1)excellent synchronized stability performance and high precision deflection compensation are possible through software control;(2)non-interlace, double-speed deflection, wide-aspect processing and HDTV.Synchronization tracking performance during CHNIDEO switching, system switching, and special playback operations for VCR is also outstanding in comparison with earlier systems. In addition, by performing high-level operation processing for various parameters set via the 12C bus system, the DSP permits high precision deflection compensation, making it possible to display images on large screens with little distortion.Furthermore, this IC is compatible with non-interlace, double-speed deflection, wide-aspect processing and HDTV.

The absolute maximum ratings of the CXD2018AQ are:(1)storage temperature:-55 to +150°C;(2)operating temperature:-20 to +75°C;(3)supply voltage:Vss-0.5 to +7.0V;(4)output voltage:Vss-0.5 to Vdd+0.5V;(5)output voltage:Vss-0.5 to Vdd+0.5V.When the V-sync signal is present and the relationships in standard mode have been fulfilled, the signal is identified as a non-standard signal and processing is performed in this mode.The feature of this mode is to use a "variable window" in order to perform stable synchronizing tracking to noise, missing V-sync signals or frequency fluctuation.In addition to normal interlace processing, the CXD2018AQ is also capable of non-interlace processing,making it suitable for use with teletext broadcasts. In the normal interlace method, the relationship between the vertical deflection sawtooth wave and the video signal is as shown in the figure below; the same information as in field 1 comes in field 2 in a position with a 0.5 H difference. In non-interlace processing,the information CXD2018AQ in fields 1 and 2 must be in the same position.