AD9929BBCZ datasheet(39/64 Pages) AD

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AD9929

Rev. A | Page 39 of 64

SPECIAL VERTICAL SWEEP MODE OPERATION

The AD9929 contains a special mode of vertical timing oper-

ation called sweep mode. This mode is used to generate a

continuous number of repetitive vertical pulses that span

multiple HD lines. One example of where this mode may be

needed is at the start of the CCD readout operation. At the end

of the image exposure, but before the image is transferred by the

sensor gate pulses, the vertical interline CCD registers should be

clean of all charge. This can be accomplished by quickly shifting

out any charge with a long series of pulses on the V1 to V4

outputs. This operation spans multiple HD line lengths.

Normally the sequences are contained within one HD line

length but with the sweep mode enabled, the HD boundaries

will be ignored until the region is finished.

The special vertical sweep mode operation is only output in

CCD Region 0 and CCD Region 3 (see Figure 34), as shown in

Figure 37 and Figure 38. The SVREP_MODE register located at

Control Address 0x0A is used to enable and configure the

special sweep mode operation, as described in Table 25.

The maximum number of repeats in each region is 2048 while

operating in this mode using the SVREP0 and SVREP3

Mode_Reg(4) registers.

Table 25. Description of SVREP_MODE Register

SVREP_MODE

Description of Sweep Mode Operation

Normal Vertical Timing Operation in

all CCD Regions

Special Vertical Sweep Mode Timing

Output in CCD Region 0 Only

Special Vertical Sweep Mode Timing

Output in CCD Region 3 Only

Special Vertical Sweep Mode Timing

Output in CCD Region0 and CCD

Region 3

XV1–XV4

Figure 35. Nonoverlapping Example while Operating in Normal Vertical Timing Operation SVREP_MODE = 0 and VTPREPx = 4

XV1–XV4

NOT OUTPUT BECAUSE THE 8TH

REPETITION OVERLAPS WITH HD

Figure 36. Overlapping Example while Operating in Normal Vertical Timing Operation SVREP_MODE = 0 and VTPREPx = 8

XV1–XV4

CCD REGION 0

SCP0

SCP1 = 3

Figure 37. Sweep Mode Timing Example with SVREP_MODE = 1 and SVREP0 = 28

XV1–XV4

SCP3

SCP4 = 3

CCD REGION 3

Figure 38. Sweep Mode Timing Example with SVREP_MODE = 2 and SVREP3 = 28

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