AD9898 datasheet(29/52 Pages) AD

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REV. 0

AD9898

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VGATE MASKING OF V1–V4 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 V1–V4 and CLPOB outputs. There are two options

available for masking the V1–V4 and CLPOB outputs. The

selection is made by setting the MSHUT/VGATE_EN register

located at Control Addr 0x01. Examples of these two options

are shown in Figures 26 and 27.

Figure 26 shows an example of MSHUT/VGATE_EN = 0. In

this example, the VGATE signal is internally latched on the

falling edge of HD, resulting in the V1–V4 and CLPOB outputs

being masked when the internally latched VGATE signal is High.

Figure 27 shows an example when MSHUT/VGATE_EN = 1.

In this example, the preprogrammed MSHUT signal blocks the

VGATE input from masking V1–V4 and CLPOB outputs while

MSHUT is Low. The internally latched VGATE signal will

only mask V1–V4 and CLPOB when MSHUT is High while

operating in this mode.

V1–V4 AND CLPOB MASKED

VGATE

(PIN 45)

VGATE

(INTERNAL)

V1–V4

CLPOB

V1–V4 AND CLPOB MASKED

Figure 26. Example of VGATE Input Masking V1–V4 and CLPOB Outputs with MSHUT/VGATE_EN = 0

V1–V4 AND CLPOB MASKED

VGATE

(PIN 45)

VGATE

(INTERNAL)

V1–V4

CLPOB

MSHUT

Figure 27. Example of VGATE Input Masking V1–V4 and CLPOB Outputs with MSHUT/VGATE_EN = 1

AD9898 Datasheet(PDF) 29 Page - Analog Devices