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LM4890: LM4890 about the output to be delay

Part Number: LM4890

Hi team,

The customer is using LM4890. After the input signal is input to the LM4890 device, the customer has to wait for 2~3 seconds, then the LM4890 device

can output the signal.  The attach is his schematic and the layout. VDD is 5.2V. The capacitance that is connected to the bypass pin is 22uF/16V.

C48 is 0.1uF. C45 is 22uF/16V. 

Would you provide some solutions?

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments

  • Hi Mickey,

    The Bypass capacitor determines how fast the device turns on. The value is very high according to the datasheet this capacitor should be in the range of 0.1uF to 1uF.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer