| Cadeka CLC3800视频放大方案 |
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| 作者：未知 来源：Cadeka 点击数：139 更新时间：2008-6-26 |
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Cadeka 公司的CLC3800是三路低成本视频放大器,能以2Vpp驱动一个150欧姆或2个75欧姆负载. CLC3800还集成了8MHz 4阶低通滤波器以得到清晰的视频信号. CLC3800的固定增益为6dB, CLC3801的固定增益为9dB,CLC3802的固定增益为12dB.
CLC380x系列广泛应用在有线电视或卫星电视机顶盒(STB),便携式DVD播放器,DVD播放器,带视频输出的手提媒体波澜器(PMP)以及视频点播和视频录像机等.本文介绍了CLC3800的主要性能,方框图,输入和输出配置以及多种典型的应用电路图.
CLC3800 - Triple, Standard Definition Video Amplifier
The CLC3800 (6dB), CLC3801 (9dB), and CLC3802 (12dB) are triple low cost video amplifiers capable of driving 2Vpp into 1 (150Ω) or 2 (75Ω) video loads. The CLC3800, CLC3801, and CLC3802 feature integrated 8MHz, 4th-order low pass filters designed to cleanly pass standard definition video signals while filtering out noise and other unwanted signals , resulting in a crisper, cleaner video signal. The 4th-order filters provide improved image quality when compared to 2nd-order passive filtering solutions.
The CLC3800 video amplifier offers a fixed gain of 6dB. This integrated gain compensates for the voltage drop inherent in properly terminated video loads; ensuring a 1Vpp video signal is present at the load. If additional gain is required, the CLC3801 video amplifier offers a fixed gain of 9dB and the CLC3802 offers 12dB.
All three video amplifiers can be driven by DC-coupled signals. Thier outputs can drive either AC- or DC-coupled loads.
These video amplifiers operate from 3V to 7V supplies and consume 8.8mA of supply current, making them well suited for battery powered devices.
The CLC3800is a triple low cost video amplifier capable of driving 2Vpp into 1 (150Ω) or 2 (75Ω) video loads. The CLC3800 features integrated 8MHz, 4th-order low pass filters designed to cleanly pass standard definition video signals while filtering out noise and other unwanted signals, resulting in a crisper, cleaner video signal. The CLC3800 video amplifier offers a fixed gain of 6dB. If additional gain is required, the CLC3801 video amplifier offers a fixed gain of 9dB and the CLC3802 offers 12dB. The CLC3800 can be driven by DC-coupled signals. Its outputs can drive either AC- or DC-coupled loads.
Features
CLC3800主要特性:
Integrated 4th-order, 8MHz filters
Integrated 6, 9, or 12dB video drivers
8.8mA total supply current
0.05%/0.02˚ differential gain/phase error
DC coupled inputs
AC or DC coupled outputs
DC-coupled outputs remove the need for AC-coupling capacitors
Each channel can drive 2Vpp into 1 or 2 video loads (150Ω or 75Ω)
0.1% THD
Operates from 3V to 7V supplies
Pb-free SOIC-8 or DFN-8 packages
-40°C to +125°C operating temp. range
主要应用:
Cable or satellite set-top-box (STB)
Portable DVD players
DVD players
Portable media players with video out
Video on demand
Personal video recorders
图1. CLC380X方框图
图2. CLC3800典型输入配置
图3. CLC3800典型输出配置
图4.评估板CEB021电路图
图5.用于分量视频(RGB, YPBPR或YUV)时CLC3800的典型配置
图6.用于分量视频(RGB, YPBPR或YUV),额外的分量输出能驱动RF调制器时CLC3800的典型配置
图7.用于分量视频(CVBS)和S视频时CLC3800的典型配置
图8.六路应用时CLC3800的典型配置
详情请见:
http://www.cadeka.com/uploaded_files/CLC3800_CLC3801_CLC3802_DS.pdf[1]
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