LM1880

LM1880 No-Holds Vertical Horizontal June 1987 LM1880 No-Holds Vertical Horizontal General Description The LM1880 uses compatible Linear I2L technology to produce the first T V horizontal and vertical processing system which completely eliminates the hold controls The heart of the system is a precision 32 times horizontal frequency VCO which is designed to use a low-cost ceramic resonator as a tuning element The VCO signal is divided down in the horizontal section to produce a pre-driver output which is locked to negative sync by means of an on-chip phase detector The vertical output ramp is injection-locked by vertical sync subject to a sync window derived from the vertical countdown section A gate pulse centered on the chroma burst is also provided Features Y No frequency set-up required for horizontal or vertical Y Ceramic resonator frequency reference Y Accurate horizontal pre-driver duty cycle Y Vertical sync window referenced to horizontal Y Precise interlaced vertical output Y APC loop parameters completely adjustable Y Vertical retrace time adjustable Y Chroma burst gate output Y Internal voltage regulator Y Improved vertical lock time Block Diagram C1995 National Semiconductor Corporation TL H 7915 TL H 7915 – 1 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Current (Pin 9) 40 mA Output V...