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TLV320ADC5140: The application issues of chips

Tonyx.wu
Genius 4525 points

Part Number: TLV320ADC5140

2.docx 

Please help take a look at the attached questions and reply. Thank you!

  • 0
    TI__Guru 50250 points

    Hi,

    I've forwarded this ticket to the right engineer to support you. He will follow up with you within a day.

    Best regards,
    Jeff McPherson

  • 0 in reply to Jeff McPherson
    TI__Expert 8840 points

    Hi,

    The C14 and C15 you have pointed out are input AC-coupling capacitors.

    When the signal is connected to the INxP/M in AC-coupled mode, the device provides a DC bias voltage on the INxP/M pins in order to ensure that the voltage on these pins do not go below 0V due to AC-signal swings. The capacitors ensure:

    a) This DC bias is blocked from reaching the input signal source.

    b) Any unwanted DC voltages/offsets from the signal source don't reach the INxP/M pins.

    As mentioned in the datasheet, the inputs can also be connected to the INxP/M pins in DC-coupled configuration, in which case the C14 and C15 capacitors are not needed.

    However, even in DC-coupled configuration, the voltage on the INxP/M pins with AC-signal swings should be maintained within the recommended operation voltage at any instance, in which case the signal source must include a DC bias in order to ensure this.

    Thanks and regards,

    Lakshmi Narasimhan