These are the logic supply pins for the built-in controlMIC. The VCC1 and VCC2 pins must be externallyconnected on a PCB because they are not internallyconnected. To prevent malfunction induced by supplyripples or other factors, put a 0.01 μF to 0.1 μF ceramiccapacitor, CVCC, near these pins. To prevent damagecaused by surge voltages, put an 18 V to 20 V Zener diode,DZ, between the VCCx and COMx pins.Voltages to be applied between the VCCx and COMxpins should be regulated within the recommendedoperational range of VCC, given in Section 2.