AD9929BBCZ datasheet(51/64 Pages) AD

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AD9929

Rev. A | Page 51 of 64

MSHUT High Precision Operation

The MSHUTPOS_HP register allows fine precision control of

the MSHUT position within a line. Under normal MSHUT

operation when MSHUTPOS_HP = 0, the MSHUT polarity

changes from high to low on the negative edge of the HD pulse,

as shown in Figure 53. By using the MSHUTPOS_HP register,

the rising and falling edges of MSHUT can be delayed by

multiples of the OL counter length that has been set in the

OLEN register. For example, if MSHUTPOS_HP = 3, the

MSHUT rising and falling edges are delayed by three OL

counter cycles after the falling edge of HD, as shown in

Figure 56.

Figure 56 provides an example of high precision MSHUT and

SUBCK timing. In this example, the length of the OL counter is

shorter. This provides finer precision control of the placement

of the MSHUT pulse within a line.

XSUBCK

tEXP

XVSG1-

XVSG2

MSHUTPOS = 3

MSHUTPAT = 0, MSHUTLEN = 5

MSHUT

COUNTER

Figure 59. Example of MSHUT High Precision Timing MSHUTEN = 1 and MSHUTPOS_HP = 3

XSUBCK

tEXP

XVSG1-

XVSG2

MSHUTPOS = 3

MSHUTPAT = 0, MSHUTLEN = 5

MSHUT¹

DELAY = 3 OL

COUNTER LENGTHS

MSHUT²

NOTES

1MSHUT OUTPUT IN NORMAL OPERATION WITH MSHUTPOS_HP = 0

2MSHUT OUTPUT IN HIGH PRECISION OPERATION WITH MSHUTPOS_HP = 3

123

Figure 60. Example of MSHUT High Precision Timing MSHUTEN = 1, MSHUTPOS_HP = 3, with XSUBCKMODE_HP = 1, XSUBCKNUM_HP = 3

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