ML6431CH

December 1998 PRELIMINARY ML6430/ML6431* Genlocking Sync Generator with Digital Audio Clock for NTSC, PAL & VGA GENERAL DESCRIPTION The ML6430/ML6431 are multi-standard single-chip BiCMOS video Genlock ICs for NTSC, PAL and VGA. They are designed to provide a stable clock from an analog video signal, and to provide timing pulses for clamping, decoding, blanking and processing video signals. The ML6430/ML6431 handle VCR glitches and variations created by head switching, tape dropouts, missing sync pulses, freeze frames, high speed playback and camcorder gyro errors. The ML6430/ML6431 are designed for high noise immunity, insensitivity to varying signal amplitudes, overmodulated color carriers, and sync glitches. Advanced analog and digital clock synthesis techniques provide multi-standard and non-standard operation from a single crystal or external asynchronous clock source. Pin selectable preset modes allow operation for most video standards in simple stand-alone mode without the necessity of using the serial bus. For more demanding applications, a two wire serial control bus is available for full control of all of the ML6430/ML6431 features. The ML6430/ML6431 are ideal for clock generation in MPEG encoders, high performance display timing, and video editing. FEATURES s s s s s s s s s s s s Line locked scalable horizontal pixel clock for an arbitrary number of pixels per line Standard frequencies of 12.27, 13.5, 14.75MHz, or 4Fsc 4´/2´ or 2´/1´ clock outputs (54 and 27MHz, or 27 and 13.5MHz) and VGA clocks Audio clocks: 32, 44.1, or 48kHz, locked to video On-chip sync separator, VCO and pulse generator Low clock jitter: Short Term: