TS3A5223: Floating NO1/2 behavior when NC1/2 connected to COM1

Henry Lo

Prodigy 230 points

Part Number: TS3A5223

Hi,

Customer want to use this switch for headphone analog signal switch between two resources.

If mux switch connect NC1/2 to COM1/2 , is there any DC level still exist on NO1 & 2?

Can these un-used two pin be floating or connect to GND if no use it?

Henry Lo

TW CFAE Audio

over 1 year ago

0 Nir Gilgur over 1 year ago

TI__Genius 12545 points

Hello Henry,

Yes, there still will be some amount of voltage on the NO pins but it is very small and shouldn't affect the system. The TS3A5223 has a very low channel-to-channel crosstalk.

This is a low frequency application, so in this case the pins can remain floating without causing any undesired impact on the system.

We have an FAQ about this topic, please feel free to check it out: https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1095179/faq-what-to-do-with-unused-pins-exposed-thermal-pads

Thanks,

Nir

0 Henry Lo over 1 year ago in reply to Nir Gilgur

TI__Prodigy 230 points

Hi Nir,
codec vender concerned that there will be DC existed on NC1/No1 pin,
this might affect audio codec performance.

Will this be major concern for this audio application?

if yes, is there any other part can recommend to customer?

BR
Henry

+1 Nir Gilgur over 1 year ago in reply to Henry Lo

TI__Genius 12545 points

Hello Henry,

This shouldn't be a major concern because this application is in low frequency.

Thanks,

Nir

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TS3A5223: Floating NO1/2 behavior when NC1/2 connected to COM1