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TS5A23157 for audio/MIC switch and negative voltage tolerance

Rocson He
Intellectual 1830 points
Part Number: TS5A23157
Other Parts Discussed in Thread: TS5A22362, TS5A22364, TS5A22366

Hi Experts,

 

I have customer using TS5A23157 for years. Now we have one new user case for MIC differential signal switch.

Please see the design sch. as below.

 

Some questions that need your help as below.

Thanks.

 

  1. For TS5A23157, is it good for audio signal application ?

  2. As below spec, the absolute negative voltage tolerance is  -0.5V, while the recommended is 0V. But for the customer application, the MIC input signal has swing amplitude that below 0V, and the peak negative value could be down to -0.47V, see as below or attachment waveform.

    Could you help check if any risk to damage the pin ?

  3. And for the -0.5V limit in spec, is it because of ESD clamp protection? What’s the time level that the PIN could tolerate -0.5V ? like 10ns, 100ns ?

  4. For the application with peak-peak amplitude larger than 1V, that is, negative cycle could be more than 0.5V, should we add one DC bias like 1V or above, to avoid the negative voltage happen at IC pin ?

    Thanks.

     

  • 0
    TI__Intellectual 2165 points

    Hi Roscon,

    The TS5A23157 has low THD feature that allows audio signals to be preserved more clearly as they pass through the device.

    You are correct on the +0.5V limit in absolute maximum table is due to the mux internal ESD diode structure. The timing specification on how long can -0.5V be applied on the input pin is not available.

    The recommended operating conditions is what TI suggests customers to operate the device at for optimal performances as listed in the datasheet. For absolute maximum ratings, there is a footnote (1) at the bottom of the table,please see below highlighted in yellow. 

    Thank you, 

    Helen

  • 0 in reply to Helen Sun
    TI__Intellectual 1830 points

    Helen,

    Thanks for your comments.

    How about this topic/question below ?

    4.For the application with peak-peak amplitude larger than 1V, that is, negative cycle could be more than 0.5V, should we add one DC bias like 1V or above, to avoid the negative voltage happen at IC pin ?

    Or other device rather than TS5A23157 should be used rather ?

    Thanks.

  • 0 in reply to Rocson He
    TI__Intellectual 2165 points

    Hi Rocson,

    We recommend the input pins to be within the recommended operating conditions. So avoiding the input pin to be lower than 0V is suggested. 

    If you want to select a different mux, below is the mux selection website for your reference: 

    http://www.ti.com/switches-multiplexers/analog/products.html

    you can filter based on your Vdd/Vss range and configuration needed. 

     

    thank you,

    Helen

  • 0 in reply to Helen Sun
    TI__Intellectual 1830 points

    Hi Helen,

    Thanks for your reply.

    I understand how to select one other MUX solution with dual power supply.

    But you don't got my key question yet. my questions is still based on TS5A23157, using for audio application.

    For audio application, usually the input signal is sine. Could we add one DC bias as below for TS5A23157 ?

    This should avoid having negative voltage happen at our IC pin. How do you think ?

    Thanks.

  • 0 in reply to Rocson He
    TI__Intellectual 2165 points
    Hi Rocson,
    Thank you for your clarification. With a 1V peak to peak sine wave( min -0.5V) and the DC bias offset, your solution looks fine since the voltage input will be within recommended operating conditions.

    Thank you,
    Helen
  • 0 in reply to Helen Sun
    TI__Mastermind 45340 points

    Helen, 

    There is also a device family TS5A22362, TS5A22364, TS5A22366 that are designed for audio applications and can support negative voltage signals.  

    Thank you, 

    Adam