參數(shù)資料
型號: BT261KPJ
元件分類: TVS-瞬態(tài)抑制二極管
英文描述: Transient Voltage Suppressor Diodes
中文描述: 視頻信號發(fā)生器
文件頁數(shù): 14/56頁
文件大?。?/td> 387K
代理商: BT261KPJ
Bt261
30 MHz Pixel Clock Monolithic CMOS HSYNC Line Lock Controller
Brooktree
8
C
IRCUIT
D
ESCRIPTION
CLAMP and ZERO Outputs
L261_H
CLAMP and ZERO Outputs
The CLAMP and ZERO outputs are provided to control the clamping and zero tim-
ing of the A/D converter or Image Digitizer. The start and stop timing is program-
mable by the MPU (in pixel clock cycles). ZERO is used to autocalibrate the
comparators of the A/D converter or Image Digitizer. CLAMP is used to DC-re-
store the video signal. Both CLAMP and ZERO may be programmed to be either
active high or active low.
Capture Output
The Bt261 outputs a CAPTURE signal, which is a command register bit (CR05)
synchronized to the vertical sync or FIELD signals.
To capture a single frame of video in an interlaced system, the MPU resets the
capture bit (CR5) low, then sets it high before the next rising edge of field. At the
rising edge of FIELD, the CAPTURE output will be set to a logical zero until the
next rising edge of FIELD (one frame time), when the CAPTURE output is set
high.
In a non-interlaced system, the MPU resets the capture bit (CR5) low, then sets
it high before the falling edge of VSYNC*. When the falling edge of VSYNC* oc-
curs, the capture output will be set high until the next falling edge of VSYNC*.
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