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关于TI视频前端 钳位芯片的推荐

请问一下TI有没有类似MAX7450(视频信号调理器, 带有AGC和后肩箝位 )这种能把 视频黑电平钳位至地的芯片?求推荐。我用来做PAL视频前端的处理,是在视频滤波放大器里找吗?为什么没看到能钳位至地的芯片呢?求指点一下!!!