[AK2920] Pin number 1 2 3 4 5 PINB 6 7 8 Note) PWR AI AO Name OUTA NINA PINA VSS NINB OUTB VDD I/O note) AO AI AI PWR AI AI AO PWR Function Amplifier A Output Amplifier A Inverted Input Amplifier A No Inverted Input Power Supply Ground Amplifier B No Inverted Input Amplifier B Inverted Input A.