AD9925BBCZ datasheet(39/96 Pages) AD

39 / 96 page

AD9925

Rev. A | Page 39 of 96

SUBCK

VSUB OPERATION:

1. ACTIVE POLARITY IS POLARITY (ABOVE EXAMPLE IS VSUB ACTIVE HIGH).

2. ON-POSITION IS PROGRAMMABLE, MODE 0 TURNS ON AT THE START OF EXPOSURE, MODE 1 TURNS ON AT THE START OF READOUT.

3. OFF-POSITION OCCURS AT END OF READOUT.

4. OPTIONAL VSUB KEEP-ON MODE WILL LEAVE THE VSUB ACTIVE AT THE END OF READOUT.

XSG

VSUB

MODE 0

MODE 1

TRIGGER

VSUB

tEXP

READOUT

Figure 48. VSUB Programmability

SUBCK

MSHUT PROGRAMMABLE SETTINGS:

1. ACTIVE POLARITY.

2. ON-POSITION IS VD UPDATED AND MAY BE SWITCHED ON AT ANY TIME.

3. OFF-POSITION CAN BE PROGRAMMED ANYWHERE FROM THE FIELD OF LAST SUBCK UNTIL THE FIELD BEFORE READOUT.

XSG

MSHUT

TRIGGER

EXPOSURE

AND MSHUT

tEXP

Figure 49. MSHUT Output Programmability

TRIGGER Register Limitations

Although the TRIGGER register can be used to perform a com-

plete exposure and readout operation, there are limitations on

its use.

Once an exposure-plus readout operation has been triggered,

another exposure/readout operation cannot be triggered right

away. There must be at least one idle field (VD intervals) before

the next exposure/readout can be triggered. The same limita-

tion applies to the triggering of the MSHUT signal. There

must be at least one idle field after the completion of the

MSHUT OFF operation before another MSHUT OFF opera-

tion can be programmed.

The VSUB trigger requires two idle fields between expo-

sure/readout operations in order to ensure proper VSUB on/off

triggering. If the VSUB signal is not required to be turned on

and off in between each successive exposure/readout operation,

then this limitation can be ignored. Using the VSUB keep-on

mode is useful when successive exposure/readout operations

are required.

AD9925BBCZ Datasheet(PDF) 39 Page - Analog Devices

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