参数资料
型号: AD9887AKSZ-140
厂商: Analog Devices Inc
文件页数: 15/52页
文件大小: 0K
描述: IC INTRFACE ANALOG/DVI 160-MQFP
标准包装: 24
应用: 图形卡,VGA 接口
接口: 模拟和数字
电源电压: 3.15 V ~ 3.45 V
封装/外壳: 160-BQFP
供应商设备封装: 160-MQFP(28x28)
包装: 托盘
安装类型: 表面贴装
产品目录页面: 788 (CN2011-ZH PDF)
AD9887A
Rev. B | Page 22 of 52
ALTERNATE PIXEL SAMPLING MODE
Logic 1 input on CKINV (Pin 94) inverts the nominal ADC
clock. CKINV can be switched between frames to implement
the alternate pixel sampling mode. This allows higher effective
image resolution to be achieved at lower pixel rates, but with
lower frame rates.
On one frame, even pixels are digitized. On the subsequent
frame, odd pixels are sampled. By reconstructing the entire
frame in the graphics controller, a complete image can be
reconstructed. This is very similar to the interlacing process
used in broadcast television systems, but the interlacing is vertical
instead of horizontal. The frame data is presented to the display
at the full desired refresh rate (usually 60 Hz) so that no flicker
artifacts are added.
02838-014
OEOEOE OEOEOE
Figure 12. Odd and Even Pixels in a Frame
02838-015
O1
Figure 13. Odd Pixels from Frame 1
02838-016
E2
Figure 14. Even Pixels from Frame 2
02838-017
O1 E2 O1 E2 O1 E2 O1 E2 O1 E2 O1 E2
Figure 15. Combined Frame Output from Graphics Controller
02838-018
O3 E2 O3 E2 O3 E2 O3 E2 O3 E2 O3 E2
Figure 16. Subsequent Frame from Controller
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