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TDA4881是荷兰飞利浦公司新近推出的一种主要用于彩色监视器视频控制的集成电路。它目前在国外已用于较多的产品中,如美国康柏(Compaq)公司PC机的监视器就使用这种集成电路。 TDA4881采用20脚双列直插式塑料封装,如图1所示。其主要特点有:(1)全直流控制;(2)具有3个独立的视频通道;(3)输入黑电平钳位;(4)只有两个通道有白电平调整;(5)带有准确灰度跟踪的亮度控制;(6)3个通道可同时进行对比度控制;(7)能对内部基准进行阴极反馈,以进行关断控制,适应不稳定的视频供给电压;(8)电流输出作为RGB信号电流;(9)RGB电压可输出到外部峰化电路;(10)具有屏幕保护功能。
TDA4881 is Philips Holland recently introduced a mainly used for color monitor video control integrated circuits. It is currently used abroad in more products, such as the United States PC Compaq PC monitors use this integrated circuit. TDA4881 20-pin dual in-line plastic package, shown in Figure 1. Its main features are: (1) full DC control; (2) has three independent video channels; (3) input black level clamp; (4) only two channels have white level adjustment; (6) Three channels for simultaneous contrast control; (7) Cathode feedback to internal reference for off-control to accommodate unstable video supply voltage; (8) Current Output as RGB signal current; (9) RGB voltage can be output to the external peaking circuit; (10) has a screen saver function.