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AD9920A

Rev. B | Page 43 of 112

Special Pattern Insertion

Additional flexibility is available using the SPC_PAT_EN

pattern to be inserted into a series of Group A repetitions. This

feature is useful when a different pattern is needed at the start,

middle, or end of a sequence.

Figure 54 shows an example of a sweep region using VPATA

with multiple repetitions where a single repetition of VPATB

has been added into the middle of the sequence. Figure 55

shows more detail on how to set the registers to achieve the

desired timing.

Note that VREPB is used to specify which repetition number

has the special pattern inserted instead of VPATA. VPATB

always has priority over VPATC or VPATD if more than one

SPC_PAT_EN bit is enabled (that is, SPC_PAT_EN, Bit 0 has

priority over SPC_PAT_EN, Bit 1 and Bit 2).

XV1 TO XVx

REGION 1: SWEEP REGION

LINE 0

LINE 1

REGION 0

REGION 2

LINE 24

LINE 25

LINE 2

SCP1

SCP2

PATTERN B INSERTED DURING PATTERN A REPETITIONS

Figure 54. Special Pattern Insertion Example

XV1

V-PATTERN A

V-PATTERN B

V-PATTERN A

REP 1

REP 2

REP N

REP 5

REP 4

REP 3

DESCRIPTION:

SPC_PAT_EN[0] = 1

V-PATTERN B IS USED AS SPECIAL PATTERN

VREPA = N

TOTAL NUMBER OF REPS USED FOR SEQUENCE (N REPS)

VREPB = 4

REP 4 USES V-PATTERN B INSTEAD OF V-PATTERN A

NOTES

1. VSTARTB MUST BE SET EQUAL TO VSTARTA.

Figure 55. Special Pattern Insertion Registers

AD9920ABBCZ Datasheet(PDF) 43 Page - Analog Devices

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