• although it is possible to connect them together, please note the following points:
      • ・unexpected dc current may flow between unused terminals.
      • ・since the cutoff frequency is determined by the input impedance and the capacitance value of the coupling capacitor, connecting unused terminals together to a single coupling capacitor will increase the cutoff frequency and may reduce the noise rejection effect.
      • ・if noise from unused pins is a problem, increase the capacitance value of the coupling capacitor connected to gnd to reduce the noise from the unused pins.