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參數(shù)資料
型號(hào)： LC749870LG
廠商： SANYO SEMICONDUCTOR CO LTD
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PBGA64
封裝： 5 X 5 MM, FLGA-64
文件頁(yè)數(shù)： 25/44頁(yè)
文件大小： 538K
代理商： LC749870LG
LC749870LG
No.A1765-31/44
AGC Mode and Non-AGC Mode
Switch between non-AGC mode and AGC mode using I2C_SCARTON.
Non-AGC mode is used when the amplitude of the video signal is steady in the environment of an strong electric field.
The maximum of the sync tip clamped analog video input amplitude assumes 1.0Vp-p in non-AGC mode. The ADC
full-scale input range is fixed at 1.4Vp-p.
AGC mode is used when the amplitude of the video signal is unsteady in the environment of a weak electric field. The
maximum of the sync tip clamped analog video input amplitude assumes a value no greater than from 0.7Vp-p (-3dB)
to 1.4Vp-p (+3dB) in AGC mode. Because the AFEVRTC is controlled according to the amplitude of SYNC detected
by the decoder, AGC mode is enabled by varying the ADC full-scale input range.
3. Data Interpolator
Data interpolator converts the input video signal sampled at 27MHz into 4fsc data. Supported video systems are shown
in the following table.
Table 2 Supported Video System
Input
Output
Video System
Sampling clock
Data transfer rate
Clock lock method
NTSC
27MHz
14.318180MHz
Burst lock
PAL-B, G, D, K, I
27MHz
17.734476MHz
Burst lock
PAL-M
27MHz
14.302444MHz
Burst lock
PAL-N
27MHz
14.328224MHz
Burst lock
NTSC4.43
27MHz
17.734476MHz
Burst lock
PAL-60
27MHz
17.734476MHz
Burst lock
SECAM
27MHz
13.5MHz
H lock
4. APC (Auto Phase Control)
In order to burst lock input video signals, the APC circuit detects the color burst phase error. The data interpolation
coefficient is calculated using the detected phase error, and is then output to the data interpolator circuit. It is equipped
with a function to turn on the color killer when not burst-locked, and also has an ACC circuit to maintain the amplitude
of the carrier chrominance signal at a constant level.
5. AGC (Auto Gain Control)
The AGC keeps the sync level constant by automatically calculating an appropriate gain value from the input video
signal sync level and amplifying the input video signal. Because the AGC circuit includes a time constant circuit,
following rapid changes in the input video signal can be suppressed.
Fig.2 Waveform Change Before and After AGC
Sync level
Pedestal level
Sync tip level
After AGC
Before AGC
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LC749870W 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Silicon gate NTSC/PAL/SECAM Digital Video Decoder
LC749880T 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Silicon gate Image controller LSI for LCD-TV
LC749880T-E 功能描述:視頻 IC 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
LC74FCT162245T 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
LC74FCT16245T 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Dual 8-bit Bus Transceiver
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