參數(shù)資料
型號(hào)： S5D0127X01-Q0R0
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： MULTISTANDARD VIDEO DECODER/SCALER
中文描述： 多標(biāo)準(zhǔn)視頻解碼器/倍線器
文件頁(yè)數(shù)： 8/96頁(yè)
文件大?。?/td> 1509K
代理商： S5D0127X01-Q0R0
ELECTRONICS
S5D0127X01 Data Sheet
MULTIMEDIA VIDEO
PAGE 8 OF 96
Modified on May/04/2000
1. FUNCTIONAL DESCRIPTION
1.1. VIDEO INPUT
The S5D0127X01 supports complete video decoding of many analog video standards. In addition, the chip can
support direct 8-bit YCbCr input for high quality video scaling and other processing.
1.1.1. Analog Video Input
Figure 1 shows the detailed block diagram of the analog front end. Up to six composite video sources, three
S-video sources, one 3-wire YCbCr component video source, or any combination can be selected. The allowed
inputs are selected using the
INSEL[3:0]
bits in the
CMDB
register. Table 1 lists all possible input selections. The
front end has two paths each containing an analog gain control, a clamping control, and an 8-bit ADC. Composite
video input uses only the luma path. S-video and analog component YCbCr inputs utilize both the luma and
chroma paths. The ADC digital data is used to calculate the correct gain and clamp values. The data is feedback to
the analog clamping and gain control. This architecture eliminates any offset and gain mismatch in the analog front
end.
Figure 1. Analog Front End
The analog inputs must be AC coupled through an external 0.1
μ
F capacitor clamp. Due to the high sampling rate
of the ADC’s inside the S5D0127X01, most video sources will not require a low-pass filter for alias reduction. For
those video sources with harmonics above 13 MHz, a simple single order pole at 6 MHz will provide sufficient high
frequency signal reduction. This can be implemented with a 400 pF capacitor in parallel with the 75
load.
Figure 2. Typical Analog Video Input
8 Bit ADC
AGC
LPF
M
AY0
AY1
AY2
M
AC0
AC1
AC2
AGC
8 Bit ADC
LPF
OFFSET
GAIN
OFFSET
VRT
VRB
COMP1
To Chroma Processing
To Luma Processing
To Timing Generation
8-bit
Digital
Input
75
0.1
μ
F
Analog
Video
S5D0127X01
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