AD9848 Datasheet, PDF (23/36 Pages) Analog Devices – CCD Signal Processors with Integrated Timing Driver

AD9848/AD9849
Horizontal Sequence Control
The AD9848/AD9849 uses Sequence Change Positions (SCP)
and Sequence Pointers (SPTR) to organize the individual horizon-
tal sequences. Up to four SCPs are available to divide the
readout into four separate regions, as shown in Figure 12.
The SCP 0 is always hard-coded to line 0, and SCP1–3 are regis-
ter programmable. During each region bounded by the SCP, the
SPTR registers designate which sequence is used by each signal.
CLPOB, CLPDM, PBLK, and HBLK each have a separate
set of SCP. For example, CLPOBSCP1 will define Region 0
for CLPOB, and in that region any of the four individual
CLPOB sequences may be selected with the CLPOBSPTR
registers. The next SCP defines a new region, and in that
region each signal can be assigned to a different individual
sequence. The Sequence Control Registers are summarized
in Table VI.
...
HD
...
HBLK
H1/H3
H1/H3
H2/H4
THE POLARITY OF H1 DURING BLANKING IS PROGRAMMABLE (H2 IS OPPOSITE POLARITY OF H1)
...
...
Figure 11. HBLK Masking Control
SEQUENCE CHANGE OF POSITION #0
(V-COUNTER = 0)
SEQUENCE CHANGE OF POSITION #1
SEQUENCE CHANGE OF POSITION #2
SINGLE FIELD (1 VD INTERVAL)
CLAMP AND PBLK SEQUENCE REGION 0
CLAMP AND PBLK SEQUENCE REGION 1
CLAMP AND PBLK SEQUENCE REGION 2
SEQUENCE CHANGE OF POSITION #3
CLAMP AND PBLK SEQUENCE REGION 3
NOTE
UP TO FOUR INDIVIDUAL HORIZONTAL CLAMP AND BLANKING REGIONS MAY BE
PROGRAMMED WITHIN A SINGLE FIELD, USING THE SEQUENCE CHANGE POSITIONS.
Figure 12. Clamp and Blanking Sequence Flexibility
Table VI. Horizontal Sequence Control Parameters for CLPOB, CLPDM, PBLK, and HBLK
Register Name Length Range
Description
SCP1–SCP3
12b
SPTR0–SPTR3 2b
0–4095 Line Number CLAMP/BLANK SCP to Define Horizontal Regions 0–3
0–3 Sequence Number Sequence Pointer for Horizontal Regions 0–3
REV. 0
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