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參數(shù)資料
| 型號(hào)： | AD9937 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CCD Signal Processor with Precision Timing⑩ Generator |
| 中文描述： | CCD信號(hào)處理器精確定時(shí)⑩發(fā)生器 |
| 文件頁(yè)數(shù)： | 32/44頁(yè) |
| 文件大小： | 410K |
| 代理商： | AD9937 |
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REV. 0
–32–
AD9937
12-BIT
HD COUNTER
LMSTART0
LMLENx
1
LMSTART1
8-BIT
LM COUNTER
LMx
1
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))
LMREPn
2
= 3
LM PULSE SET 1
1
2
LM PULSE SET 2
NOTES
1
x = 0, 1 (TWO UNIQUE SETS OF LM OUTPUTS CAN BE PROGRAMMED)
2
n = 0, 1, 2, 3, 4 (INDIVIDUAL REPETITION CONTROL FOR EACH CCD REGION)
3
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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