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你连英文说明都没有看,就一口肯定20脚不是切换AM/FM的。
AM/FM changeover(AM/FM转换)
• AM/FM changeover is made using pin 20 as shown right.(如右图所示,使用20脚进行转换)
• However, the voltage on pin 20 relative to VCC(pin 7) must be withinthe range of +0.1V to – 0.8V.(但是,引脚20上相对于VCC(引脚7)的电压必须在+ 0.1V至– 0.8V的范围内。)
If not within this range, distortion andselectivity will get worse. (如果不在该范围内,则失真和选择性将变差。)
A resistance of 68kΩ at the IFT cold terminal,which is used to prevent the changeover circuit from malfunctioning,must be connected.(必须在IFT{中周}冷端连接一个68kΩ的电阻,以防止转换电路发生故障。) |
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