AD9942 datasheet(22/36 Pages) AD

Part #	AD9942

Description	Dual-Channel, 14-Bit CCD Signal Processor with Precision Timing??Core

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AD9942

Rev. A | Page 22 of 36

CHANNEL A AND CHANNEL B HORIZONTAL CLAMPING AND BLANKING

The AD9942 horizontal clamping and blanking pulses are fully

programmable to suit a variety of applications. Individual

sequences are defined for each signal, which are then organized

into multiple regions during image readout. This allows the

dark pixel clamping and blanking patterns to be changed at

each stage of the readout to accommodate different image

transfer timing and high speed line shifts.

INDIVIDUAL CLPOB AND PBLK SEQUENCES

The AFE horizontal timing consists of CLPOB and PBLK, as

shown in Figure 21. These two signals are independently

programmed using the parameters shown in Table 19. The start

polarity, first toggle position, and second toggle position are

fully programmable for each signal. The CLPOB and PBLK

signals are active low and should be programmed accordingly.

Up to four individual sequences can be created for each signal.

INDIVIDUAL HBLK SEQUENCES

The HBLK programmable timing, shown in Figure 22, is similar

to CLPOB and PBLK. However, there is no start polarity

control. Only the toggle positions are used to designate the start

and stop positions of the blanking period. Additionally, there is

a polarity control, HBLKMASK, which designates the polarity

of the horizontal clock signal H1 during the blanking period.

Setting HBLKMASK high sets H1 low and H2 high during the

blanking, as shown in Figure 23. Up to four individual

sequences are available for HBLK.

Table 19. Channel A and Channel B CLPOB and PBLK Individual Sequence Parameters

Parameter

Length

(Bit)

Range

Description

Polarity

1

High/low

Starting polarity of CLPOB and PBLK pulses for Sequences 0 to 3.

Toggle Position 1

12

0 to 4095 pixel locations

First toggle position within the line for Sequences 0 to 3.

Toggle Position 2

12

0 to 4095 pixel locations

Second toggle position within the line for Sequences 0 to 3.

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