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TS3A24159: TS3A24159 ripple/noise

Shinu.V.Mathew
Expert 8145 points
Part Number: TS3A24159

Hi Team,

One of our customer is using TS3A24159 and getting ripple/noise at the output. The input for this analog switch is pure DC signal which converted from PWM with 50% duty cycle. Fer testing/observing the behavior we shorted the input and output pins and observed the ripple/noise is completely vanished, the ripple/noise is getting introduced to circuit once the switch is connected, plaese find the attached wave forms and schematic for reference.

TS3A24159.pdf

Can you please help with some thoughts to rectify this issue. Thanks in advance for your help and support.

With Regards,

Shinu Mathew. 

  • 0
    TI__Mastermind 45495 points

    Shinu,

    Is it possible to provide scope shots of pins 1,2,3,4, (Vcc, NO1, COM1,IN1) and 1,3,4,5 (Vcc, COM1, IN1, NC1) when NO and NC are selected.  We would like to confirm that the waveforms from COM to NC and NO are unaltered since the TS3A24159 is a passive FET switch.

    Thank you,

    Adam  

  • 0 in reply to Adam Torma
    TI__Expert 8145 points

    Hi Adam,

    Thanks for the support. 

    Apologies for the delay due to unavailability of samples. Attached is the wave from for your reference.

    TS3A24159 pin wave form .pdf

    Please help with you thoughts to address this issue.

    Regards,

    Shinu Mathew. 

  • 0 in reply to Shinu.V.Mathew
    TI__Expert 8145 points
    Hi Adam,

    Can you please look in to the attached waveform and help with your suggestions.

    Regards,
    Shinu Mathew.
  • 0 in reply to Shinu.V.Mathew
    TI__Mastermind 45495 points

    Shinu,

    It looks like the Vcc pin has some noise on it.  Is that noise similar to the ripple you are seeing?  Do you have a decoupling capacitor on the supply pin to help remove noise on the bus?

    Do we know what the rest of the schematic looks like?

    How pure is this DC signal?  The TS3A24159 is not an ideal switch like a wire and will have a parasitic Resistance and Capacitance due to the solid state signal path.  Do you think this parasitic capacitance could be causing the issue?

    Thank you,

    Adam