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參數(shù)資料
| 型號： | 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)： | 37/60頁 |
| 文件大小： | 647K |
| 代理商： | BT457KPJ80 |
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Bt457/Bt458
4.0 Application Information
125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette RAMDAC
4.2 Using Multiple Devices
L45801 Rev. N
Conexant
4-5
4.2 Using Multiple Devices
When multiple RAMDACs are used, each RAMDAC should have its own power
plane ferrite bead. In addition, a single voltage reference can drive multiple
devices; however, isolation resistors are recommended to reduce color channel
crosstalk.
Higher performance can be obtained if each RAMDAC has its own voltage
reference. This can further reduce the amount of color channel crosstalk and color
palette interaction.
Each RAMDAC must still have its own RSET resistor, analog output
termination resistors, power supply bypass capacitors, COMP capacitor, and
VREF capacitor.
4.3 Bt457 Nonvideo Applications
The Bt457 can be used in nonvideo applications by disabling the video-specific
control signals. SYNC* should be a logical 0, and BLANK* should be a logical 1.
The relationship between RSET and the full-scale output current (Iout) in this
configuration is as follows:
RSET (
) = 7,457 * VREF (V) / Iout (mA)
With the DAC data inputs at $00, there is a DC offset current (Imin) defined
as follows:
Imin (mA) = 610 * VREF (V) / RSET (
)
Therefore, the total full-scale output current is Iout + Imin.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BT458KG110 | 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) |
| BT458KG125 | 制造商: 功能描述: 制造商:undefined 功能描述: 制造商:BROOKTREE 功能描述: |
| BT458KG135 | 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) |
| BT458KG80 | 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) |
| 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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