LM567為鎖相環音頻譯碼電路、即只有當輸入信號的頻率和電路自身的振蕩頻率相一致時，電路輸出低電平，否則輸出高電平
LM567為鎖相環音頻譯碼電路。它在電路中的功用是作選頻用，即只有當輸入信號的頻率和電路自身的振蕩頻率相一致時，電路輸出低電平，否則輸出高電平。它的內部原理框圖如圖1。
LM567為鎖相環音頻譯碼電路
LM567外形為8腳雙列直插塑料封裝。電路第5、6腳外接電阻R7、電容C9決定了鎖相環內部壓控振蕩器的中心頻率：f0=1/1.1R*C。第1、2腳對地所接電容分別為輸出濾波網絡和鎖相環路單極低通濾波網絡。第2腳所接電容C11影響鎖相環路的捕捉帶寬。帶寬BW=1070（Vi/foC11）ˉ2（佔fo的百分比）。式中：Vi為3腳輸入的正弦波電壓有效值，單位為mV，C11單位為μF。第1腳所接電容的容量至少是2腳電容容量的兩倍。第3腳輸入信號要求>25mV。第8卻為邏輯輸出端，允許大灌電流為100mA。LM567的工作電壓為4.75-9V，工作頻率為500kHz（高值）。
倍德立（廈門）科技有限公司
銷售經理:張衛東 聯係電話：13055237500 座機：0592-6085900 QQ:3454941352
銷售經理：楊帆 聯係電話：13358371730 座機：0592-6085900 QQ: 2921696645
銷售經理：葉工 聯係電話：15359890861 座機：0592-6087118 QQ: 2650907184
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