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參數(shù)資料
| 型號(hào)： | BT457KPJ80 |
| 英文描述： | Video DAC with Color Palette (RAMDAC) |
| 中文描述： | 視頻DAC的調(diào)色板（的RAMDAC） |
| 文件頁數(shù)： | 31/60頁 |
| 文件大?。?/td> | 647K |
| 代理商： | BT457KPJ80 |
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Bt457/Bt458
3.0 PC Board Layout Considerations
125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette RAMDAC
3.7 Analog Signal Interconnect
L45801 Rev. N
Conexant
3-7
3.7 Analog Signal Interconnect
The Bt457 and Bt458 should be located as close as possible to the output
connectors. This minimizes noise pickup and reflections caused by impedance
mismatch.
Analog outputs are susceptible to crosstalk from digital lines; digital traces
must not be routed under or adjacent to the analog output traces.
To maximize the high-frequency power supply rejection, the video output
signals should not overlay the analog power plane.
For maximum performance, the analog video output impedance, cable
impedance, and load impedance should be the same.
Analog output video edges exceeding the CRT monitor bandwidth can be
reflected, producing cable-length dependent ghosts. Simple pulse filters can
reduce high-frequency energy, reducing EMI and noise. The filter impedance
must match the line impedance.
3.8 Analog Output Protection
The Bt457 and Bt458 analog outputs should be protected against high-energy
discharges, such as those from monitor arc-over or from
“
hot-switching
”
AC-coupled monitors.
The diode protection circuit illustrated in
Figure 3-2
can prevent latchup under
severe discharge conditions without adversely degrading analog transition times.
The 1N4148/9 are low-capacitance, fast-switching diodes, which are available in
multiple-device packages (FSA250X or FSA270X) or surface-mountable pairs
(BAV99 or MMBD7001).
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相關(guān)代理商/技術(shù)參數(shù) |
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| BT458LG165 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC) |
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