AD9992BBCZ datasheet(48/92 Pages) AD

48 / 92 page

AD9992

Rev. C | Page 48 of 92

Read After Exposure

To read the CCD data after exposure, the SG should resume

normal activity while the SUBCK remains null. By default,

the AD9992 generates the VSG pulses in every field. When only

a single exposure and a single frame read are desired, such as is

the case in the preview mode, the VSG and SUBCK pulses can

operate in every field.

Other applications require that more frames are read, in which

case SUBCK must be masked until the readout is finished.

The SUBCKMASK_NUM register specifies the total number of

fields (exposure and read) to mask SUBCK. A 2-field CCD

frame read mode typically requires two additional fields of

SUBCK masking (SUBCKMASK_NUM = 2). A 3-field, 6-phase

CCD requires three additional fields of SUBCK masking after

the read begins (SUBCKMASK_NUM = 3).

Note that the SUBCKMASK_SKIP1 register setting allows

SUBCK pulses at the beginning of the field of exposure.

Table 21. SUBCK and Exposure/Read Register Parameters

Length

Range

Description

SGMASK_NUM

13b

0 to 8191 fields

Exposure duration (number of fields to suppress VSG) for LS operation.

SUBCKMASK_NUM

13b

0 to 8191 fields

Exposure plus readout duration (number of fields to suppress SUBCK) for LS.

SUBCKMASK_SKIP1

On/off

Suppress SG/SUBCK masks for one field (default = 0). Typically set to 1.

SUBCKSTARTLINE1

13b

0, 2 to 8191 line locations

Line location to start the SUBCK pulses, relative to SGLINE location.

A value of 1 is invalid. See the SUBCK Start Line section.

SUBCKNUM1

13b

1 to 8191 pulses

Total number of SUBCKs per field, at 1 pulse per line. Must be <VDLEN.

SG_SUPPRESS1

On/off

Suppress the SG and allow SUBCK to finish at SUBCKNUM.

SUBCK_TOG1

13b

0 to 8191 pixel locations

SUBCK Toggle Position 1.

SUBCK_TOG2

13b

0 to 8191 pixel locations

SUBCK Toggle Position 2.

SUBCK_POL

Low/high

SUBCK start polarity.

SUBCKHP_TOG1

13b

0 to 8191 pixel locations

High precision SUBCK Toggle Position 1. Selectable as SG or VD updated.

SUBCKHP_TOG2

13b

0 to 8191 pixel locations

High precision SUBCK Toggle Position 2. Selectable as SG or VD updated.

1 Register is not VD updated but is updated at the start of the line after the sensor gate line.

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