FWD1LDCTL2TEST3IN14TEST5TEST6IN27VCC8VOL-9VOL+10VO2-11VO2+12VO1-13VO1+14VO4+15VO4-16VO3+17VO3-18GND19BIAS20MUTE21OPOT322OPIN3-23OPIN3+24OPOUT425OPIN4-26OPIN4+27REV28EP29