Overview: VP5313/VP5513
NTSC/PAL Digital Video Encoder
Supersedes DS4509 1.9 September 1997 edition DS4509 - 2.2 October 1998 The VP5313/VP5513 converts digital Y Cr Cb data into analog PAL or NTSC posite video, and also provides simultaneous RGB outputs. These additional converters can optionally provide separate luma and chroma outputs plus a further posite video channel. All outputs are capable of 34 driving doubly terminated 75Ω loads with standard video levels. All D/A converters are to 9 bit accuracy, and are provided with 27MHz oversampled data. The latter simplifies the requirement for external analog anti-aliasing filters, and reduces the sinx/x distortion inherent in D/A converters. Separate digital scaling is applied to the chroma data path in order to make the most efficient use of the 9 bit dynamic range. 44 The device accepts data inputs plying with CCIR remendation 656. In this format 4:2:2 video is multiplexed onto an 8 bit bus using a 27MHz clock. Active video markers are embedded into the data stream and extracted by the VP5313/VP5513. Optionally the user can supply separate horizontal and vertical syncs, and colour can be genlocked to an external subcarrier if necessary. PIN In an alternative operating mode the VP5313/VP5513 can 1 be configured as the source of sync for the rest of the system. 2 In this master mode the horizontal and vertical sync pins bee outputs, and any control codes in the CCIR656 bit 3 stream are ignored. .. 4 The VP5313/VP5513 supports the insertion of teletext 5 data through a serial interface. An internal filter shapes the 6 data edges.
