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參數(shù)資料
| 型號： | SAF7113 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 9-bit video input processor |
| 中文描述： | 9位視頻輸入處理器 |
| 文件頁數(shù)： | 9/80頁 |
| 文件大?。?/td> | 281K |
| 代理商： | SAF7113 |
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2000 May 08
9
Philips Semiconductors
Product specification
9-bit video input processor
SAF7113H
8
FUNCTIONAL DESCRIPTION
8.1
Analog input processing
The SAF7113H offers four analog signal inputs, two
analog main channels with source switch, clamp circuit,
analog amplifier, anti-alias filter and video 9-bit CMOS
ADC; see Fig.6.
8.2
Analog control circuits
The anti-alias filters are adapted to the line-locked clock
frequency via a filter control circuit. The characteristics are
shown in Fig.3. During the vertical blanking period, gain
and clamping control are frozen.
6
V
(dB)
42
0
2
4
6
8
10
12
14
f (MHz)
MGD138
6
12
18
24
30
36
0
Fig.3 Anti-alias filter.
8.2.1
C
LAMPING
The clamp control circuit controls the correct clamping of
the analog input signals. The coupling capacitor is also
used to store and filter the clamping voltage. An internal
digital clamp comparator generates the information with
respect to clamp-up or clamp-down. The clamping levels
for the two ADC channels are fixed for luminance (120)
and chrominance (256). Clamping time in normal use is
set with the HCL pulse at the back porch of the video
signal.
8.2.2
G
AIN CONTROL
The gain control circuit receives (via the I
2
C-bus) the static
gain levels for the two analog amplifiers or controls one of
these amplifiers automatically via a built-in Automatic Gain
Control (AGC) as part of the Analog Input Control (AICO).
The AGC (automatic gain control for luminance) is used to
amplify a CVBS or Y signal to the required signal
amplitude, matched to the ADCs input voltage range.
The AGC active time is the sync bottom of the video signal.
Signal (white) peak control limits the gain at signal
overshoots. The flow charts (see Figs 7 and 8) show more
details of the AGC. The influence of supply voltage
variation within the specified range is automatically
eliminated by clamp and automatic gain control.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SAF7113H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:9-bit video input processor |
| SAF7113H/V1,518 | 功能描述:視頻 IC VIDEO INPUT PROCESSR RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| SAF7113H/V1,557 | 功能描述:視頻 IC 9-BIT VIDEO INPUT PROCESSOR RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| SAF7115 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard video decoder with super-adaptive comb filter, |
| SAF7115ET | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard video decoder with super-adaptive comb filter, |
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