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TS5A3159: TS5A3159DCKR

Eric Conner
Prodigy 140 points
Part Number: TS5A3159

We are using this part to switch audio source to drive the input to an amplifier.

In one position is our full scale audio signal and the other is an attenuated version of the same audio signal.

We are seeing that with VCC=3.3V and with the switch positioned to the attenuated signal, there seems to crosstalk coming from the full scale signal at the top portion of the signal.

When VCC of the part is changed to 5V, this crosstalk is not present. A 4Vp-p 1KHz input sine wave was used to demonstrate this issue as shown in attached.

  • 0
    TI__Expert 5265 points

    Hello Eric,

    Can you please explain what each signal is in the scope? 

    Also what is the device connected to? Providing a schematic will be very helpful. 

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 140 points

    Sure, please see attached schematic. Thanks

  • 0 in reply to Eric Conner
    Prodigy 140 points

    Expecting to see about 1.35Vp-p at U8-4 with switch in B0 position. I does seem to be that signal except for the tower added to the positive side of the wave.

  • 0 in reply to Eric Conner
    TI__Expert 5265 points

    Hello Eric,

    Thank you for the additional information.

    The device is being powered by 3.3V and the signal going into pin 1 (B1) is 4V. While that pin is disconnected it might be causing a failure to the device since the signal is exceeding the voltage supply. 

    You mentioned when VCC is 5V you don't see the faulty violet signal, which makes sense since the signal on pin 1 is now below VCC. Also if you keep everything the same and decrease VCC, the violet signal should widen. If this is the case then the issue is most likely caused by the 4V signal going to the unselected pin. 

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 140 points

    I was thinking that could be the case but also thought it would just clip anything above the 3.3V rail. Curious why it would amplify the signal above 1.35V since this is well below the 3.3V?

  • 0 in reply to Eric Conner
    TI__Expert 5265 points

    Hello Eric,

    The device doesn't have beyond the supply operation capabilities, or other protection features Operating it above the recommended voltage might damage the device, or in your case will output a faulty signal. 

    I agree this is interesting regarding the amplified signal, but since the device is operating beyond the recommended range, we can't guarantee nor predict the behavior of the device. 

    Thanks,

    Nir