for analog audio processors,for a product that operates with one or two positive power supplies, can unused input signal terminals be grouped together with a single coupling capacitor?|faq|rohm semiconductor-ag凯发旗舰厅
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for analog audio processors,for a product that operates with one or two positive power supplies, can unused input signal terminals be grouped together with a single coupling capacitor?
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.