MK1573-02

GenClock ™ MK1573-02 HSYNC to Video Clock Description The MK1573 GenClock™ provides genlock timing for video overlay systems. The device accepts the horizontal sync (HSYNC) signal as the input reference clock, and generates a frequencylocked high speed output. Stored in the device are the multipliers for 16 combinations of popular frequencies for analog and digital TV and set-top box systems. Frequency-locked outputs include 1X, 4X, and 8X the subcarrier frequencies of NTSC and PAL systems, and 27MHz plus 13.5MHz for digital video systems. In most selections, the chip recovers the HSYNC clock by outputting a low jitter 50% duty cycle version of HSYNC. Also available is an inverted recovered HSYNC clock, and a double speed recovered HSYNC clock. MicroClock can customize this device for any other different frequencies. Features Packaged in 16 pin narrow (150 mil) SOIC The -02 version has one frequency changed (32MHz was added), and tracks the HSYNC better than the -01 version. Exact ratios stored in the device eliminate the need for external dividers Accepts HSYNC of 15.625kHz or 15.73426kHz Highly accurate frequency generation within 1 ppm Generates NTSC/PAL subcarrier frequencies, and 4X and 8X of those frequencies Generates 27MHz and 13.5MHz 2X HSYNC clock available Recovered HSYNC clock available Inverted HSYNC clock available 4.5V to 5.5V operation Block Diagram VDD GND 2 FS0-3 4 2 Clock Synthesis and Control Circuitry Output Buffer Output Buffe...