IC手册|STV2248中放,解码,行,场扫描小信号处理

脚号有信号电压/V无信号电压/V黑笔接地/KΩ红笔接地/KΩ引脚功能12.42.412.812.5伴音中频信号输入122.42.412.812.5伴音中频信号输入231.91.910.412.5伴音中频AGC滤波43.23.29.614.8中放电压基准51.91.91012.5图像中频AGC滤波62.42.412.812.5图像中频信号输入172.42.412.812.7图像中频信号输入283.83.89.228高放AGC输出92.12.11115.5中频锁相环滤波100000中放地114.14.110.314AM/FM音频输出125.15.1613.5中放电源133322内部视频输出141.61.61414外接音频输入154.14.16.514中频振荡线圈164.14.16.514中频振荡线圈178.48.40.50.5电源(视频/亮度部分)183.43.41214视频输入1190000地(视频亮度部分)203.23.21214视频2部分212.62.612.213.8黑电平延伸滤波223.23.210.813.8Y/视频3输入230.10.11321C输入(S-V)241.81.81213自动RGB尖峰调整252.42.410.316外接蓝基色/U(B-Y)输入261.61.610.316外接绿基色/Y输入272.42.410.316外接红基色/V(R-Y)输入280000外接消隐输入293.43.411.712.5空脚302.72.711.711.5蓝基色输出312.72.711.711.5绿基色输出322.62.611.711.5红基色输出334.74.7912电流检测输入340.30.31216蓝字符输入350.30.31216绿字符输入360.30.31216红字符输入370010.9字符消隐输入380011.112.5外接微调电容390011.5133.58MHz晶振连接401.21.211.513.54.43MHz晶振连接411.71.71114彩色锁相环滤波423.93.99.516.8XTAL控制/垂直DAC输出/彩色基准信号输出430000地(彩色/扫描部分)444.24.298.6第一视频开关输出458.38.357电源(彩色/扫描部分)466.76.710.217束流控制/安全保护输入474.44.410.218场脉冲输出48227.69.4行脉冲输出490.70.710.59逆程脉冲输入/沙堡脉冲输出504.14.111.313扫描锁相环滤波512.22.26.517.5I²C总线时钟端522.12.1617.5I²C总线数据端535.25.26.211.2电源(数字电路部分)540000地(数字电路部分)554.14.113.514主音频输出561.41.410.223FM解码

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