參數(shù)資料
型號: AD9898KCP-20
廠商: ANALOG DEVICES INC
元件分類: 消費(fèi)家電
英文描述: CCD Signal Processor with Precision Timing⑩ Generator
中文描述: SPECIALTY CONSUMER CIRCUIT, QCC48
封裝: MO-220-VKKD-2, LFCSP-48
文件頁數(shù): 23/52頁
文件大?。?/td> 557K
代理商: AD9898KCP-20
REV. 0
AD9898
–23–
EXTERNAL SYNCHRONIZATION (MASTER MODE)
External synchronization can be used to synchronize the VD
and HD signal by applying an external pulse on the SYNC/
VGATE pin (Pin 45) for master mode operation. The SYNC/
VGATE pin is configured as an external SYNC input for mas-
ter mode operation by setting the SLAVE_MODE register
(Addr 0xD6) = 0. (The AD9898 defaults to slave mode at
power-up.)
SYNCCNT (Addr 0x0A) and SYNCPOL (Addr 0x01) are the
only two registers used for configuring the AD9898 for external
synchronization. The SYNCPOL is a 1-bit register used for
configuring the SYNC input as either active low or active high.
The AD9898 defaults to active low at power-up. The function
of the SYNCCNT register is described in Table X. Figures 16
and 17 provide two examples of external synchronization with
SYNCPOL = 0.
Table X. External Synchronization (Master Mode)
SYNCCNT
External Synchronization Options
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Disable External Synchronization
VD Sync at every SYNC Pulse
VD Sync after Second Applied SYNC Pulse
VD Sync after Third Applied SYNC Pulse
VD Sync after Fourth Applied SYNC Pulse
VD Sync after Fifth Applied SYNC Pulse
VD Sync after Sixth Applied SYNC Pulse
VD Sync after Seventh Applied SYNC Pulse
VD Sync after Eighth Applied SYNC Pulse
VD Sync after Ninth Applied SYNC Pulse
VD Sync after Tenth Applied SYNC Pulse
VD Sync after Eleventh Applied SYNC Pulse
VD Sync after Twelfth Applied SYNC Pulse
VD Sync after Thirteenth Applied SYNC Pulse
VD Sync after Fourteenth Applied SYNC Pulse
VD Sync after First Applied SYNC Pulse Only
2 CLI
MIN
MODE A
MODE B
SERIAL
WRITES
OPERATION
MODE
VD
4 CLI
4 CLI
4 CLI
CHANGE TO MODE B
SYNC
Figure 16. Example of Synchronization with SYNCPOL = 0 and SYNCCNT = 1
4 CLI
4 CLI
4 CLI
2 CLI
MIN
VD
SYNC
Figure 17. Example of Synchronization with SYNCPOL = 0 and SYNCCNT = 3
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