Dual-channel amplifier circuit composed of LM4912

As shown in the figure, this is the LM4912 dual-channel amplifier circuit. The left and right channel audio signals are input to the 1st and 5th pins of the LM4912 respectively, and are output from the 9th and 7th pins respectively after being amplified by the internal amplifier, and are added to the speakers of each channel through the coupling capacitor Co. The maximum power consumption of the amplifier is PDMAX = VDD2/2π22RL. (Output capacitor coupling mode). The 2nd pin of the LM4912 is externally connected to the shutdown control. When the 2nd pin is connected to VDD, it is allowed to work; when it is connected to a low level, it is prohibited to work, reducing the power consumption of the chip. The 3rd pin of the LM4912 is the mute control. When the 3rd pin is connected to VDD, it is prohibited to work to eliminate the "click-pop" sound caused by the conversion; when it is connected to a low level, it is allowed to work.