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): 45/56頁
文件大?。?/td> 387K
代理商: BT261KPJ
Brooktree
39
A
PPLICATION
I
NFORMATION
Interfacing to the Bt254
L261_H
Bt261
30MHz Pixel Clock Monolithic CMOS HSYNC Line Lock Controller
Interfacing to the Bt254
Figure 13 illustrates the interface of the Bt261 to the Bt254 Image Digitizer. The
VIDEO input of the Bt261 connects directly to the CSYNC* output of the Bt254.
As CSYNC* is a TTL-compatible output, the highest sync slicing level should be
selected on the Bt261.
The Bt261 provides the ZERO and CLAMP signals required by the Bt254, in
addition to the (R,G,B) CLOCK inputs of the Bt254.
The HSYNC, VSYNC*, FIELD, and CAPTURE signals of the Bt261 interface to
the video timing controller and video DRAM controller.
ESD and Latchup Considerations
Correct ESD-sensitive handling procedures are required to prevent device damage,
which can produce symptoms of catastrophic failure or erratic device behavior
with somewhat "leaky" inputs.
Latchup can be prevented by ensuring that all VCC pins are at the same poten-
tial and that the VCC supply voltage is applied before the signal pin voltages. The
correct power-up sequence ensures that any signal pin voltage will never exceed
the power supply voltage by more than +0.5 V.
Figure 13. Interfacing to the Bt254
VIDEO ZERO CLAMP CLOCK
CSYNC* ZERO CLAMP RCLOCK GCLOCK BCLOCK
Bt254
Bt261
HSYNC
VSYNC*
FIELD
CAPTURE
To Video Timing
Controller And
DRAM Controller
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