AD9929BBCZ datasheet(33/64 Pages) AD

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AD9929

Rev. A | Page 33 of 64

VGATE MASKING OF XV1 TO XV4 AND CLPOB OUTPUTS

During slave mode operation, the SYNC/VGATE Pin 45 is

configured as an input for an external VGATE signal. While

operating in this mode, the external VGATE signal can be used

to mask the XV1 to XV4 and CLPOB outputs. There are two

options available for masking the XV1 to XV4 and CLPOB

outputs. These options are determined by the setting of the

MSHUT/VGATE_EN register located at Control Address 0x01.

Examples of these two options are shown in Figure 30 and

Figure 31. Figure 30 shows MSHUT/VGATE_EN = 0. In this

example, the VGATE signal is internally latched on the falling

edge of HD, resulting with the XV1 to XV4 and CLPOB outputs

being masked when the internally latched VGATE signal is

high.

Figure 31 shows MSHUT/VGATE_EN = 1. In this example, the

preprogrammed MSHUT signal blocks the VGATE input from

masking XV1 to XV4 and CLPOB outputs while MSHUT is low.

The internally latched VGATE signal only masks XV1 to XV4

and CLPOB when MSHUT is high, while operating in this

mode.

VGATE

(INTERNAL)

(PIN #45)

XV1–XV4

CLPOB

XV1–XV4 AND CLPOB MASKED

Figure 30. Example of VGATE Input Masking V1 to V4 and CLPOB Outputs with MSHUT/VGATE_EN = 0

VGATE

(PIN #45)

XV1–XV4

(INTERNAL)

CLPOB

MSHUT

XV1–XV4 AND CLPOB MASKED

Figure 31. Example of VGATE Input Masking V1to V4 and CLPOB Outputs with MSHUT/VGATE_EN = 1

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