AD9991 datasheet(29/60 Pages) AD

29 / 60 page

AD9991

–29–

off positions. STROBON_FD is the ﬁeld in which the STROBE

is turned on, measured from the ﬁeld containing the last SUBCK

before exposure begins. The STROBON_ LN PX register gives

the line and pixel positions with respect to STROBON_FD. The

STROBE off position is programmable to any ﬁeld, line, and

pixel location with respect to the ﬁeld of the last SUBCK.

TRIGGER Register Limitations

While the TRIGGER register can be used to perform a complete

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 limitation 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

operation may be programmed.

The VSUB trigger requires two idle ﬁelds between exposure/

readout operations in order to ensure proper VSUB on/off trig-

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

off in between each successive exposure/readout operation, this

limitation can be ignored. The VSUB Keep-On mode is useful

when successive exposure/readout operations are required.

SUBCK

STROBE PROGRAMMABLE SETTINGS:

1. ACTIVE POLARITY.

2. ON POSITION IS PROGRAMMABLE IN ANY FIELD DURING THE EXPOSURE TIME (WITH RESPECT TO THE FIELD CONTAINING THE LAST SUBCK).

3. OFF POSITION IS PROGRAMMABLE IN ANY FIELD DURING THE EXPOSURE TIME.

EXP

VSG

STROBE

TRIGGER

EXPOSURE

AND STROBE

Figure 31. STROBE Output Programmability

Table XII. VSUB, MSHUT, and STROBE Register Parameters

Length

Range

Description

VSUBMODE[0]

High/Low

VSUB Mode (0 = Mode 0, 1 = Mode 1) (See Figure 29).

VSUBMODE[1]

High/Low

VSUB Keep-On Mode. VSUB will stay active after readout

when set high.

VSUBON[11:0]

12b

0–4095 Line Location

VSUB On Position. Active starting in any line of ﬁeld.

VSUBON[12]

High/Low

VSUB Active Polarity.

MSHUTPOL[0]

High/Low

MSHUT Active Polarity.

MSHUTPOL[1]

On/Off

MSHUT Manual Enable (1 = Active or Open).

MSHUTON

24b

0–4095 Line/Pix Location

MSHUT On Position Line [11:0] and Pixel [23:12] Location.

MSHUTOFF_FD

12b

0–4095 Field Location

Field Location to Switch Off MSHUT (Inactive or Closed).

MSHUTOFF_LNPX

24b

0–4095 Line/Pix Location

Line/Pixel Position to Switch Off MSHUT (Inactive or Closed).

STROBPOL

High/Low

STROBE Active Polarity.

STROBON_FD

12b

0–4095 Field Location

STROBE ON Field Location, with Respect to Last SUBCK Field.

STROBON_LNPX

24b

0–4095 Line/Pix Location

STROBE ON Line/Pixel Position.

STROBOFF_FD

12b

0–4095 Field Location

STROBE OFF Field Location, with Respect to Last SUBCK Field.

STROBOFF_LNPX

24b

0–4095 Line/Pix Location

STROBE OFF Line/Pixel Position.

REV. 0

AD9991 Datasheet(PDF) 29 Page - Analog Devices

AD9991 Datasheet(HTML) 29 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Datasheet Download

Link URL