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AD9942 Datasheet(PDF) 22 Page - Analog Devices |
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AD9942 Datasheet(HTML) 22 Page - Analog Devices |
22 / 36 page 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. |
Similar Part No. - AD9942_15 |
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Similar Description - AD9942_15 |
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