AD9937 datasheet(32/44 Pages) AD

32 / 44 page

REV. 0

–32–

AD9937

12-BIT

HD COUNTER

LMSTART0

LMLENx1

LMSTART1

8-BIT

LM COUNTER

LMx1

PROGRAMMABLE CLOCK POSITIONS

1. LM_INVERT (PROGRAMMABLE AT CONTROL 0x04)

2. LMTOG1_x (PROGRAMMABLE AT HLM_REG(8))

3. LMTOG2_x (PROGRAMMABLE AT HLM_REG(8))

LMREPn2 = 3

LM PULSE SET 1

LM PULSE SET 2

NOTES

1x = 0, 1 (TWO UNIQUE SETS OF LM OUTPUTS CAN BE PROGRAMMED)

2n = 0, 1, 2, 3, 4 (INDIVIDUAL REPETITION CONTROL FOR EACH CCD REGION)

Figure 26. Example of LM Pulse with LMSTART1 < HDLEN

12-BIT

HD COUNTER

LMSTART0

LMLENx

8-BIT

LM COUNTER

LMx

LMREPn = 3

LM PULSE SET 1

Figure 27. Example of LM Pulse with LMSTART1 > HDLEN

SPECIAL HORIZONTAL PATTERN TIMING

The AD9937 provides the ability to interrupt the normal hori-

zontal H1(A–D) and H2(A, B) clocking in order to apply a

special pattern on these outputs. This special horizontal pattern

timing occurs during the period when the LM outputs are active.

Table XVI lists the registers used to program the special H

patterns. Figure 28 provides an example of a special H pattern

being applied to the H1A output.

The timing diagram shown in Figure 28 identifies the registers

associated with outputting the special H patterns. Although only

the H1A output is shown, the same special H timing can be

independently configured on the remaining horizontal outputs

by using the registers described in Table XVI. As shown in

Figure 28, the special H1A output begins when SPHSTARTx

is reached. It is important to note that there are two SPHSTART

registers. If SPHPATSEL = 0, the SPHSTART0 register will

be used, whereas if SPHPATSEL = 1, the SPHSTART1 regis-

ter will be used. The special H patterns can be enabled and

disabled for each of the five CCD regions by using the SPHENx

(x = 0, 1, 2, 3, 4).

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