AD9923ABBCZ datasheet(49/88 Pages) AD

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AD9923A

Rev. 0 | Page 49 of 88

Table 38. SUBCK and TRIGGER Register Parameters

Length

(Bits)

Range

Description

TRIGGER

On/off for eight signals

0: triggers SHUT0 signal.

1: triggers SHUT1 signal.

2: triggers SHUT2 signal.

3: triggers SHUT3 signal.

4: triggers VSUB0 signal.

5: triggers VSUB1 signal.

6: triggers EXPOSURE operation.

7: triggers READOUT operation.

READOUTNUM

0 to 7 fields

Number of fields to suppress SUBCK after exposure.

EXPOSURENUM

0 to 4095 fields

Number of fields to suppress to SUBCK and VSG during exposure time (low

speed shutter).

VDHDOFF

On/off

Disable VD/HD output during exposure.

1 = disable VD.

0 = enable VD.

SUBCKPOL1

High/low

SUBCK start polarity for SUBCK1 and SUBCK2.

SUBCK1TOG11

0 to 4095 pixel locations

First toggle positions for first SUBCK pulse (normal shutter).

SUBCK1TOG21

0 to 4095 pixel locations

Second toggle positions for first SUBCK pulse (normal shutter).

SUBCK2TOG11

0 to 4095 pixel locations

First toggle positions for second SUBCK pulse in last line (high precision).

SUBCK2TOG21

0 to 4095 pixel locations

Second toggle positions for second SUBCK pulse in last line (high precision).

SUBCKNUM1

1 to 4095 pulses

Total number of SUBCKs per field, at one pulse per line.

SUBCKSUPPRESS1

0 to 4095 pulses

Number of pulses, after the VSG line, to suppress SUBCK.

SUBCKMASK1

0 to 3 masking mode

Additional masking of SUBCK output.

0 = no additional mask.

1 = start mask at VD edge.

2 = use internal SHUT3 signal to mask.

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

Shutter Outputs

The AD9923A contains three shutter output pins: VSUB,

MSHUT, and STROBE. Internally, there are six possible shutter

signals available: VSUB0, VSUB1, SHUT0, SHUT1, SHUT2,

and SHUT3. Any of these signals, and the following combinations:

SHUT0 ^ VSUB0, SHUT0 ^ VSUB1, SHUT0 ^ SHUT1,

SHUT0 ^ SHUT2, can be mapped to any of the output pins

using the VSUB_CTRL, MSHUT_CTRL, and STROBE_CTRL

registers.

The VSUB signals behave differently than the SHUT signals,

and are generally used for the VSUB output pin. If a more generic

approach is desired for the shutter signals, the SHUT signals can

be used for the VSUB output pin.

It is also possible to configure the SYNC pin as an output and

send one of the internal shutter signals, or the combinations listed

above, to the SYNC pin using the TESTO_CTRL register

function. This provides the flexibility of outputting up to four

shutter outputs if the external SYNC input function is not needed.

VSUB Signal Operation

The CCD readout bias (VSUB) can be programmed to accom-

modate different CCDs. Figure 67 shows two available modes.

In Mode 0, VSUB goes active when the exposure begins during

the field of the last SUBCK. The on position (rising edge in

Figure 67) is programmable to any line within the field. VSUB

remains active until the end of the image readout. In Mode 1,

the VSUB is not activated until the start of the readout.

A function called VSUB_KEEPON is also available. When the

appropriate VSUB_KEEPON bit is set high, the VSUB output

remains active, even after the readout has finished. To disable

the VSUB at a later time, return this bit to low.

The AD9923A contains two programmable VSUB signals,

VSUB0 and VSUB1. Either of these signals can be mapped to

the VSUB output pin, the MSHUT pin, or the STROBE pin.

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