PDF SAA1101 Data sheet ( Hoja de datos )

Número de pieza	SAA1101
Descripción	Universal sync generator USG
Fabricantes	Philips
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No Preview Available ! INTEGRATED CIRCUITS DATA SHEET SAA1101 Universal sync generator (USG) Product speciﬁcation File under Integrated Circuits, IC02 January 1990 1 page Philips Semiconductors Universal sync generator (USG) Product speciﬁcation SAA1101 Lock modes The USG offers four lock modes: • Lock from the subcarrier • Slow sync. lock, external Href • Slow sync. lock, internal Href • Fast sync. lock, internal Href LOCK FROM SUBCARRIER Lock from subcarrier to the line frequency for the above mentioned TV systems is given below; the horizontal frequency (fH) = 15.625 kHz for 625 line systems and 15.734264 kHz for 525 line systems. subcarrier input is, in this case, used as an external input for the horizontal reference, see Fig.3(d). SELECTION OF LOCK MODE Lock mode is selected using the inputs LM0 and LM1 as illustrated in the Table below. LM0 0 0 1 1 LM1 0 1 0 1 SELECTION lock to subcarrier slow sync. lock external Href slow sync. lock internal Href fast sync. lock internal Href SECAM (1 and 2) PALN NTSC (1 and 2) PALM PAL B/G 282fH 229.2516fH 227.5fH 227.25fH 283.7516fH These relationships are obtained by the use of a phase locked loop and the internal programmed divider chain, see Fig.3(a). LOCK TO AN EXTERNAL SIGNAL SOURCE The following methods can be used to lock to an external signal source: 1. Sync. lock slow; the line frequency is locked to an external signal. The line and frame information are extracted from the external sync. signal and used separately in the lock system. The line information is used in a phase-locked loop where external and internal line frequencies are compared by the same phase detector as is used for the subcarrier lock. The external frame information is compared with the internal frame in a slow lock system; mismatch of internal and external frames will result in the addition or suppression of one line depending on the direction of the fault. The maximum lock time for frame lock is 6.25 s, see Fig.3(b). 2. Sync. lock fast. A fast lock of frames is possible with a frame reset which is extracted out of the incoming external sync. signal, see Fig.3(c). 3. Sync. lock with external reference. Lock of an external sync. signal to the line frequency with an external line reference to make possible a shifted lock. The January 1990 5 5 Page CS 1st half picture CS 2nd half picture NTSC 1 (2) CB 1st half picture 2nd half CB picture VD NTSC 1 + 2 (2) BK 1st half picture BK 2nd half picture BK 1st half picture PAL−M BK 2nd half picture BK 3rd half picture BK 4th half picture NTSC 2 (2) CB 1st half picture CB 2nd half picture start half picture tWCB 6H 9H 11H(1) 21H + tWCB 19H + tWCB MGH197 (1) H = 1 horizontal scan. (2) NTSC mode reset; the fourth half picture is identical to the second half picture for NTSC. Fig.6 Typical output waveforms for NTSC and PAL-M. In the 524-line mode the output waveforms are identical to the first half picture of NTSC and are not interlaced. 11 Page

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