AD9847 datasheet(19/28 Pages) AD

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REV. A

AD9847

–19–

HBLK

H1/H3

H2/H4

. . .

THE POLARITY OF H1 DURING BLANKING IS PROGRAMMABLE (H2 IS OPPOSITE POLARITY OF H1)

Figure 11. HBLK Masking Control

Horizontal Sequence Control

The AD9847 uses sequence change positions (SCP) and sequence

pointers (SPTR) to organize the individual horizontal 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 register 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.

UP TO FOUR INDIVIDUAL HORIZONTAL CLAMP AND BLANKING REGIONS MAY BE

PROGRAMMED WITHIN A SINGLE FIELD, USING THE SEQUENCE CHANGE POSITIONS.

SEQUENCE CHANGE OF POSITION #1

SEQUENCE CHANGE OF POSITION #2

SEQUENCE CHANGE OF POSITION #3

SINGLE FIELD (1 VD INTERVAL)

CLAMP AND PBLK SEQUENCE REGION 0

SEQUENCE CHANGE OF POSITION #0

(V-COUNTER = 0)

CLAMP AND PBLK SEQUENCE REGION 3

CLAMP AND PBLK SEQUENCE REGION 2

CLAMP AND PBLK SEQUENCE REGION 1

Figure 12. Clamp and Blanking Sequence Flexibility

Table VI. Horizontal Sequence Control Parameters for CLPOB, CLPDM, PBLK, and HBLK

Length

Range

Description

SCP1–SCP3

12b

0–4095 Line Number

CLAMP/BLANK SCP to Define Horizontal Regions 0–3

SPTR0–SPTR3

0–3 Sequence Number

Sequence Pointer for Horizontal Regions 0–3

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