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參數資料
| 型號： | AD9898 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CCD Signal Processor with Precision Timing⑩ Generator |
| 中文描述： | CCD信號處理器精確定時⑩發(fā)生器 |
| 文件頁數： | 44/52頁 |
| 文件大小： | 557K |
| 代理商： | AD9898 |
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REV. 0
–44–
AD9898
STROBE Control
The AD9898 provides a STROBE output pulse that can be used
to trigger the camera flash circuit. STROBE operation is set by
only one register, as described in Table XXV. The STROBE
output is held Low when STROBE_EN (Addr 0x0B) is set to
0 and enabled when set to 1. Providing STROBE_EN = 1, the
STROBE output pulse will be asserted High on the rising edge of
the last SUBCK pulse in the field, as shown in Figure 48.
Figure 48 also shows the STROBE pulse asserted Low again on
the rising edge of VSG.
SLAVE AND MASTER MODE OPERATION
The AD9898 can be operated in either slave mode or master
mode. It defaults to the slave mode operation at power-up. The
1
2
1. STROBE OUTPUT ASSERTED HIGH ON RISING EDGE OF LAST SUBCK PULSE.
2. STROBE OUTPUT ASSERTED LOW ON NEGATIVE EDGE OF VSG PULSE.
SUBCK
STROBE
VSG1–
VSG2
VD
t
EXP
SET STROBE_EN (ADDR 0x0B) = 1
Figure 48. STROBE Output Timing
INTERNAL 12-BIT H-GRAY CODE COUNTER IS RESET 7 CLOCK CYCLES AFTER THE HD FALLING EDGE.
VD
HD
CLI
H-GRAY CODE
COUNTER
(PIXEL COUNTER)
X
X
X
X
X
X
X
X
X
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0
1
2
3
4
H-COUNTER
RESET
H-COUNTER
RESET
3ns MIN
Figure 49. External VD/HD and Internal 12-Bit H-Gray Code Counter Synchronization, SLAVE Mode
SLAVE_MODE register (Addr 0xD6) can be used to configure
the AD9898 into master mode by setting SLAVE_MODE = 0.
Slave Mode Operation
While operating in slave mode, VD, HD, and VGATE are pro-
vided externally from the image processor. VGATE is input
active high on Pin 45. Unlike master mode operation, there is a
7 CLI clock cycle delay from the falling edge of HD to when the
12-bit gray code H counter is reset to zero (see Figure 49).
Master Mode Operation
While operating in master mode, VD and HD are outputs and
the SYNC/VGATE pin is configured as an external SYNC input.
Master mode is selected by setting register SLAVE_MODE
(Addr 0xD6) = 0.
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