参数资料
型号: AD9981KSTZ-80
厂商: Analog Devices Inc
文件页数: 10/44页
文件大小: 0K
描述: IC INTERFACE 10BIT ANALOG 80LQFP
标准包装: 90
应用: 视频
接口: 模拟
电源电压: 3.13 V ~ 3.47 V
封装/外壳: 80-LQFP
供应商设备封装: 80-LQFP(14x14)
包装: 管件
安装类型: 表面贴装
AD9981
Preliminary Technical Data
Rev. 0 | Page 18 of 44
HSYNCOUT
VSYNC
FILTER
WINDOW
EXPECTED
EDGE
FILTER
WINDOW
EQUALIZATION
PULSES
HSYNCIN
04739-016
Figure 10. Sync Processing Filter
Vsync Filter and Odd/Even Fields
The Vsync filter is used to eliminate spurious Vsyncs, maintain
a stable timing relationship between the Vsync and Hsync
output signals, and generate the odd/even field output.
The filter works by examining the placement of Vsync with
respect to Hsync and if necessary shifting it in time slightly.
The goal is to keep the Vsync and Hsync leading edges from
switching at the same time, thus eliminating confusion as to
when the first line of a frame occurs. Register 0x14, Bit 2
enables the Vsync filter. Use of the Vsync filter is recommended
for all cases, including interlaced video, and is required when
using the Hsyncs per Vsync counter. Figure 12 illustrates
even/odd field determination in two situations.
FIELD 1
FIELD 0
SYNC SEPARATOR THRESHOLD
FIELD 1
FIELD 0
23
2
1
44
31
HSYNCIN
VSYNCIN
VSYNCOUT
O/E FIELD
ODD FIELD
QUADRANT
04739-017
Figure 11.
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