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參數(shù)資料
| 型號(hào)： | CH7002D-V |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Scalable VGA to NTSC/PAL Encoder |
| 中文描述： | 可擴(kuò)展顯卡至NTSC / PAL編碼器 |
| 文件頁(yè)數(shù)： | 32/36頁(yè) |
| 文件大?。?/td> | 199K |
| 代理商： | CH7002D-V |
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CHRONTEL
CH7002D
32 201-0000-029 Rev6.1, 8/2/99
Power Supply Sequencing
It is important to ensure that the three separate power supply rails of theCH7002 (VDD, AVDD, and DVDD) are
applied simultaneously during the power-up process. Failure to do so may, in rare instances, put the CH7002 into a
non-functional “l(fā)atchup” condition, which can possibly destroy the device.When the power rails are derived from a
single 5 volt source as shown in Figure 27, sequencing is not an issue and the latchup problem will not occur. In
some designs, however, the analog (AVDD, VDD) and digital (DVDD) supplies may be derived from separate
sources such as the separate outputs of a multi-output switching power supply. In this case, significant delays may
be created between application of the analog and digital voltages, creating the potential latchup condition.
Whenever the possibility of power sequencing delays exist, the design should include back-to-back connected
diodes coupling the analog and digital supply rails, as shown in Figure 27.
Using this arrangement, the first supply to come up will “pull” the other supply rail along with it, eliminating the
latchup potential. Use of rectifier-type diodes with at least 400mA forward current ratings is suggested. It is
suggested that the diodes be connected on the power-supply side of any ferrite beads or other isolation networks
Figure 26: Power Sequencing
CH7002B
1N4001
25 37 7, 40, 44
8, 14, 33
POWER SUPPLY
OUTPUT
#1
POWER SUPPLY
OUTPUT
#2
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