LM567为锁相环音频译码电路、即只有当输入信号的频率和电路自身的振荡频率相一致时，电路输出低电平，否则输出高电平
LM567为锁相环音频译码电路。它在电路中的功用是作选频用，即只有当输入信号的频率和电路自身的振荡频率相一致时，电路输出低电平，否则输出高电平。它的内部原理框图如图1。
LM567为锁相环音频译码电路
LM567外形为8脚双列直插塑料封装。电路第5、6脚外接电阻R7、电容C9决定了锁相环内部压控振荡器的中心频率：f0=1/1.1R*C。第1、2脚对地所接电容分别为输出滤波网络和锁相环路单极低通滤波网络。第2脚所接电容C11影响锁相环路的捕捉带宽。带宽BW=1070（Vi/foC11）ˉ2（占fo的百分比）。式中：Vi为3脚输入的正弦波电压有效值，单位为mV，C11单位为μF。第1脚所接电容的容量至少是2脚电容容量的两倍。第3脚输入信号要求>25mV。第8却为逻辑输出端，允许大灌电流为100mA。LM567的工作电压为4.75-9V，工作频率为500kHz（高值）。
倍德立（厦门）科技有限公司
销售经理:张卫东 联系电话：13055237500 座机：0592-6085900 QQ:3454941352
销售经理：杨帆 联系电话：13358371730 座机：0592-6085900 QQ: 2921696645
销售经理：叶工 联系电话：15359890861 座机：0592-6087118 QQ: 2650907184
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