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參數(shù)資料
| 型號： | SAA7111AHZ |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | GT 13C 13#16 SKT PLUG |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 X 1.40 MM, PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 10/72頁 |
| 文件大小： | 441K |
| 代理商： | SAA7111AHZ |
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1998 May 15
10
Philips Semiconductors
Product specification
Enhanced Video Input Processor (EVIP)
SAA7111A
8
FUNCTIONAL DESCRIPTION
8.1
Analog input processing
The SAA7111A offers four analog signal inputs, two
analog main channels with source switch, clamp circuit,
analog amplifier, anti-alias filter and video CMOS ADC
(see Fig.5).
8.2
Analog control circuits
The anti-alias filters are adapted to the line-locked clock
frequency via a filter control circuit. During the vertical
blanking time, gain and clamping control are frozen.
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 (60) and
chrominance (128). 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
Signal (white) peak control limits the gain at signal
overshoots. The flow charts (see Figs 13 and 14) 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.
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).
Fig.3
Analog line with clamp (HCL) and gain
range (HSY).
handbook, halfpage
HCL
MGL065
HSY
analog line blanking
TV line
1
60
255
GAIN
CLAMP
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.
8.3
Chrominance processing
The 8-bit chrominance signal is fed to the multiplication
inputs of a quadrature demodulator, where two subcarrier
signals from the local oscillator DTO1 are applied
(0 and 90
°
phase relationship to the demodulator axis).
The frequency is dependent on the present colour
standard. The output signals of the multipliers are
low-pass filtered (four programmable characteristics) to
achieve the desired bandwidth for the colour difference
signals (PAL and NTSC) or the 0 and 90
°
FM-signals
(SECAM).
The colour difference signals are fed to the
Brightness/Contrast/Saturation block (BCS), which
includes the following five functions:
AGC (Automatic Gain Control for chrominance
PAL and NTSC)
Chrominance amplitude matching (different gain factors
for R
Y and B
Y to achieve CCIR-601 levels
Cr and Cb for all standards)
Chrominance saturation control
Luminance contrast and brightness
Limiting YUV to the values 1 (min.) and 254 (max.) to
fulfil CCIR-601 requirements.
Fig.4 Automatic gain range.
handbook, halfpage
analog input level
controlled
ADC input level
maximum
minimum
range tbf
0 dB
0 dB
MGG063
+
4.5 dB
7.5 dB
(1 V(p-p) 27/47
)
相關PDF資料 |
PDF描述 |
|---|---|
| SAA7112 | Decoder With High-Performance Scaler(HPS) for Image Port (PELICAN)(運用在影像端口中的帶有高性能定標器的譯碼器) |
| SAA7113H | 9-bit Video Input Processor(9位視頻輸入處理器) |
| SAA7113 | GT 14C 14#16 PIN PLUG |
| SAA7114H | PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC comb filter, VBI data slicer and high performance scaler |
| SAA7114E | PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC comb filter, VBI data slicer and high performance scaler |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7111AHZ/V4,557 | 功能描述:視頻 IC ENHANCED 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 |
| SAA7111H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Video Input Processor VIP |
| SAA7111H/01 | 制造商:NXP Semiconductors 功能描述:VIDEO INPUT PROCESSOR (VIP), PQFP64 |
| SAA7111HBG | 制造商:NXP Semiconductors 功能描述:VIDEO INPUT PROCESSOR (VIP), PQFP64 |
| SAA7111WP | 制造商:Philips Semiconductor 功能描述: 制造商:NXP Semiconductors 功能描述: 制造商:PHILIPS-SEMI 功能描述: 制造商:Yageo / Phycomp 功能描述:TV/VIDEO SIGNAL PROCESSOR, 68 Pin, Plastic, PLCC |
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