參數(shù)資料
型號(hào)： BT457KG125
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(yè)數(shù)： 27/60頁(yè)
文件大小： 647K
代理商： BT457KG125
Bt457/Bt458
3.0 PC Board Layout Considerations
125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette RAMDAC
3.3 Device Decoupling
L45801 Rev. N
Conexant
3-3
3.3 Device Decoupling
For optimum performance, all capacitors should be located as close as possible to
the device, using the shortest possible leads (consistent with reliable operation) to
reduce the lead inductance. Chip capacitors are recommended for minimum lead
inductance. Radial lead ceramic capacitors can be substituted for chip capacitors
and are better than axial lead capacitors for self-resonance. Values chosen have
self-resonance above the pixel clock.
3.4 Power Supply Decoupling
The best power supply decoupling performance is obtained by providing a 0.1 μF
ceramic capacitor in parallel with a 0.01 μF chip capacitor to decouple each group
of VAA pins to GND. The capacitors should be placed as close as possible to the
device VAA and GND pins.
The 10 μF capacitor illustrated in
Figure 3-2
is for low-frequency power
supply ripple; the 0.1 μF and 0.01 μF capacitors are for high-frequency power
supply noise rejection. The decoupling capacitors should be connected at the
VAA and GND pins, using short, wide traces.
When using a linear regulator, the power-up sequence must be verified to
prevent latchup. A linear regulator is recommended to filter the analog power
supply if the power supply noise is greater than 200 mV This is especially
important when using a switching power supply and the switching frequency is
close to the raster scan frequency.
NOTE:
About 10 percent of power supply hum and ripple noise less than 1 MHz
will couple onto the analog outputs.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BT457KG80 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)
BT457KPJ110 制造商:BROOKTREE 功能描述:
BT457KPJ125 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)
BT457KPJ135 制造商:BROOKTREE 功能描述: 制造商:Brooktree 功能描述:Digital Analog Converter, Single, 8 Bit, 84 Pin, PLCC 制造商:Brooktree (BT) 功能描述:Digital Analog Converter, Single, 8 Bit, 84 Pin, PLCC 制造商:BT 功能描述:Digital Analog Converter, Single, 8 Bit, 84 Pin, PLCC
BT457KPJ80 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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