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参数资料
| 型号： | LC749870LG |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA64 |
| 封装： | 5 X 5 MM, FLGA-64 |
| 文件页数： | 26/44页 |
| 文件大小： | 538K |
| 代理商： | LC749870LG |
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LC749870LG
No.A1765-32/44
6. Digital Clamp
The digital clamp circuit detects the pedestal level of the input video signal, and keeps the level constant. Because the
digital clamp includes a time constant circuit, following rapid changes in the input video signal can be suppressed.
Fig.3 Waveform Change Before and After Digital Clamp
7. Sync Separator
The sync separator circuit separates horizontal and vertical sync signals out of the input video signals. Because an LPF
is built in, the sync signal can be separated even in a weak electric field. The weak electric field is detected using the
S/N detection result. Moreover, the stability of the sync signal in the weak electric field is improved by the internal
AFC circuit. Fig. 4 shows the LPF characteristics for the sync separator. “FILSEL = 1’b0” is the characteristic of an
LPF for a weak electric field, and “FILSEL = 1’b1” is the characteristic of an LPF for a strong electric field.
Fig.4 LPF Characteristics for Sync Separator
8. Timing Generator
Using the sync signal separated by the sync separator circuit, the timing generator generates various timing signals to
be used for each module as well as for horizontal and vertical blanking signals. The adjustments of timing signals are
possible by setting the corresponding register (s) as follows:
Positioning of horizontal sync signal: I2A_HSPAD
Positioning of vertical sync signal: I2A_VSTART
Positioning of horizontal blanking signal: I2A_HBSTART, I2A_HBEND
Positioning and width adjustment of vertical blanking signal: I2A_VBSTART, I2A_VBWIDTH
0LSB
Target pedestal level
Input signal
Before clamp
After clamp
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相关代理商/技术参数 |
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| LC749870W | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Silicon gate NTSC/PAL/SECAM Digital Video Decoder |
| LC749880T | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Silicon gate Image controller LSI for LCD-TV |
| LC749880T-E | 功能描述:视频 IC RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
| LC74FCT162245T | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| LC74FCT16245T | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Dual 8-bit Bus Transceiver |
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