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2.D/A转化与后台操作电路SAA7158 SAA7158由CMOS双材料工艺制造而成,内置了三路独立的高速数模转换器来进行亮度和色差信号的处理和转换。两路色差信号数模转换器的输出是8位的。对亮度信号在高频的最大6dB增益,以加大亮度通道的分辨率。为了避免因时变的幅度限制而引起的混淆现象,9位输出提供给亮度转换。该电路能从数字Y/U/V总线将8位带宽的亮度信号和色度信号以4∶1∶1方式输入,将其转化为Y/U/V以4∶4∶4排列的过渡形式。表2给出了SAA7158集成块各引出脚功的说明:
2.D / A Conversion and Background Operation Circuit The SAA7158 SAA7158 is manufactured from a CMOS dual-material process and incorporates three independent high-speed digital-to-analog converters for brightness and color difference signal processing and conversion. Two color difference signal digital-to-analog converter output is 8-bit. The maximum brightness of the signal in the high 6dB gain to increase the brightness of the channel resolution. In order to avoid confusion caused by time-varying amplitude limits, 9-bit output is provided for luminance conversion. This circuit can input the luminance and chrominance signals of 8 bits of bandwidth from the digital Y / U / V bus in a 4: 1: 1 manner and convert them into a 4: 4: 4 transitional form of Y / U / V . Table 2 shows the SAA7158 manifold lead pin out of the work of the instructions: