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Número de pieza | VPX3224E | |
Descripción | Video Pixel Decoders | |
Fabricantes | ETC | |
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No Preview Available ! MICRONAS
INTERMETALL
ADVANCE INFORMATION
VPX 3226E,
VPX 3225E,
VPX 3224E
Video Pixel Decoders
Edition Oct. 13, 1999
6251-483-1AI
1 page ADVANCE INFORMATION
Contents, continued
Page
Section Title
87 7.
Application Notes
87 7.1. Differences between VPX 322xE and VPX 322xD-C3
87 7.2. Differences between VPX 322xE and VPX 3220A
88 7.3. Control Interface
88
7.3.1.
Symbols
88
7.3.2.
Write Data into I2C Register
88
7.3.3.
Read Data from I2C Register
88
7.3.4.
Write Data into FP Register
88
7.3.5.
Read Data from FP Register
88
7.3.6.
Sample Control Code
89 7.4. Xtal Supplier
90 7.5. Typical Application
92 8.
Data Sheet History
VPX 322xE
MICRONAS INTERMETALL
5
5 Page ADVANCE INFORMATION
VPX 322xE
2.3. Color Decoder
In this block, the standard luma/chroma separation and
multi-standard color demodulation is carried out. The
color demodulation uses an asynchronous clock, thus
allowing a unified architecture for all color standards.
A block diagram of the color decoder is shown in Fig.
2–5. The luma, as well as the chroma processing, is
shown here. The color decoder also provides several
special modes; for example, wide band chroma format
which is intended for S-VHS wide bandwidth chroma.
The output of the color decoder is YCrCb in a 4:2:2 for-
mat.
2.3.1. IF-Compensation
With off-air or mistuned reception, any attenuation at
higher frequencies or asymmetry around the color sub-
carrier is compensated. Four different settings of the IF-
compensation are possible:
– flat (no compensation)
– 6 dB /octave
– 12 dB /octave
– 10 dB/MHz
The last setting gives a very large boost to high frequen-
cies. It is provided for SECAM signals that are decoded
using a SAW filter specified originally for the PAL stan-
dard.
dB
10
5
0
–5
–10
–15
–20
3.5
3.75
4
4.25
4.5 4.75
5 MHz
Fig. 2–4: Freq. response of chroma IF-compensation
2.3.2. 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.
Luma / CVBS
1 H Delay
Notch
Filter
Cross-
Switch
Luma
Chroma
Chroma
Fig. 2–5: Color decoder
MICRONAS INTERMETALL
IF Compensation
DC-Reject
MIXER
Lowpass Filter
Phase/Freq.
Demodulator
ACC
Color-PLL / Color-ACC
11
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet VPX3224E.PDF ] |
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VPX3224E | Video Pixel Decoders | ETC |
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