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參數(shù)資料
| 型號： | VPX3214 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Video Pixel Decoders |
| 中文描述： | 視頻解碼器像素 |
| 文件頁數(shù)： | 7/80頁 |
| 文件大?。?/td> | 752K |
| 代理商： | VPX3214 |
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VPX 3220 A, VPX 3216 B, VPX 3214 C
PRELIMINARY DATA SHEET
MICRONAS INTERMETALL
7
2.1.4. Digitally Controlled Clock Oscillator
The clock generation is also a part of the analog front-
end. The crystal oscillator is controlled digitally by the
control processor; the clock frequency can be adjusted
within
±
150 ppm if the recommended crystal is used.
2.1.5. Analog-to-Digital Converters
Two ADCs are provided to digitize the input signals.
Each converter runs with 20.25 MHz and has 8-bit reso-
lution. An integrated bandgap circuit generates the re-
quired reference voltages for the converters. The two
ADCs are of a 2-stage subranging type.
2.2. Color Decoder
In this block, the entire luma/chroma separation and
multistandard color demodulation is carried out. The col-
or demodulation uses an asynchronous clock, thus al-
lowing a unified architecture for all color standards.
Both luma and chroma are processed to an orthogonal
sampling raster. Luma and chroma delays are matched.
The total delay of the decoder is adjustable by a FIFO
memory. Therefore, even when the display processing
delay is included, a processing delay of exactly 64
μ
sec
can be achieved.
The color decoder output is YC
r
C
b
in a 4:2:2 format.
2.2.1. IF-Compensation
With off-air or mistuned reception, any attenuation at
higher frequencies or asymmetry around the color sub-
carrier is compensated. Three different settings of the
IF-compensation are possible:
– flat (no compensation)
– 6 dB/octave
– 12 dB/octave
Fig. 2–3:
Frequency response of chroma IF-com-
pensation
2.2.2. Demodulator
The entire signal (which might still contain luma) is now
quadrature-mixed to the baseband. The mixing frequen-
cy is equal to the subcarrier for PAL and NTSC, thus
achieving the chroma demodulation. For SECAM, the
mixing frequency is 4.286 MHz giving the quadrature
baseband components of the FM modulated chroma.
After the mixer, a lowpass filter selects the chroma com-
ponents; a downsampling stage converts the color dif-
ference signals to a multiplexed half-rate data stream.
The subcarrier frequency in the demodulator is gener-
ated by direct digital synthesis; therefore, substandards
such as PAL 3.58 or NTSC 4.43 can also be demodu-
lated.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VPX3214C | Video Pixel Decoders |
| VPX3224D | Video Pixel Decoders |
| VPX3224E | Video Pixel Decoders |
| VPX322XE | Video Pixel Decoders |
| VQ1000J | N-Channel Enhancement-Mode MOSFET Transistor(最小漏源擊穿電壓60V,夾斷電流0.225A的N溝道增強型MOSFET晶體管) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VPX3214C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video Pixel Decoders |
| VPX3214C(PLCC44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
| VPX3214C(QFP44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
| VPX3216B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video Pixel Decoders |
| VPX3216B(PLCC44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
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