CD22402

Features:

• Interlaced Composite Sync Output
• Automatic Genlock Capability
• Crystal Oscillator Operation
• 525 or 625 Line Operation
• Vertical Reset Option
• Wide Power Supply Operating Voltage . . . . . 4V to 15V


Application

• Cameras
• Monitors and Displays
• CATV
• Teletext
• Video Games
• Sync Restorer
• Video Service Instruments


Pinout




Specifications

DC Supply Voltage (Referenced to VSS Terminal) . . . . . . . . . . . 15V
Input Voltage Range, All Inputs (Notes 2, 3) . . . . . . V_SS  VI V_DD
DC Input Current, Any One Input (Note 2) . . . . . . . . . . .. . . ±10mA


Description

The Harris CD22402 (Note) is a CMOS LSI sync generator that produces all the timing signals required to drive a fully 2-to-1 interlaced 525-line 30-frame/second, or 625-line 25-frame/second TV camera or video processing system. A complete sync waveform is produced which begins each field with six serrated vertical sync pulses, preceded and followed by six half-width double frequency equalizing pulses. The sync output is gated by the master clock to preserve horizontal phase continuity during the vertical interval.

The CD22402 can be operated either in "genlock" mode, in which it is synchronized with a reference sync pulse train from another TV camera, or in "stand-alone" mode, in which it is synchronized with a local on-chip crystal oscillator (the crystal and two passive components are off chip). Also, the circuit can sense the presence or absence of a reference sync pulse train and automatically select the "genlock" or "stand-alone" mode.

A frame sync pulse CD22402 is produced at the beginning of every odd field. The vertical counter can be reset to either the first equalizing pulse or the first vertical sync pulse of the vertical interval. The interlaced sync provided by the CD22402 differs from RS-170 by having slightly narrower sync and equalizing pulses. The clock frequency of 32 times horizontal rate allows for approximately 4ms horizontal pulse widths and 2ms equalizing pulses. Otherwise operation can be phase locked to a color sub-carrier for a full interlaced operating system.

The CD22402 is operable with a single supply over a voltage range of 4V to 15V.