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Weird reset state for TLV320ADC3101

Ramnath Chandrachood
Prodigy 245 points
Other Parts Discussed in Thread: TLV320ADC3101

Hi,

I am using TLV320ADC3101 part for my microphone ADC conversion process. I use this chip  in slave mode configuration and I use single ended analog signal microphones as an inputs.

Now I am able to configure the chip correctly using I2C bus and I use internal PLL mode as a clock source to the chip. The IC is running fine in normal cases.

I noticed one thing that as soon as I insert the microphone in the microphone jack, large voltage spike gets generated. It travels across all the board and fortunately it does not hurt any other circuit other than TLV320ADC3101. This spike causes TLV320ADC3101 to go back to reset mode and as a result ADC does not work anymore unless I reprogram it using I2C.FYI this spike usually travels through ground plane and not signal plane and the spike usually has a strength of 30Vpp for duration of 170ns.

Is there any way to prevent this spike on the board or else to make TLV320ADC3101 circuit more robust to withstand such voltage spike?

Thanks in advance.

  • 0
    TI__Mastermind 28585 points

    Perhaps some diode clamps and a resistor network to control the current would help. 30 vpp is going to cause more problems that just a reset. This could quickly limit the life expectancy of the ADC.

  • 0 in reply to Converter Apps
    Prodigy 245 points

    Hi,

    Could you throw some examples of the resistor network circuit or diode clamp circuit design?  I am not very pro in ESD protection device designs.

    Here is what my circuit looks like -

    I do have ESD protection diodes on the signal path but it did not help.

    Actually ESD pulse is generated and traveled through the ground path.

    Can  you give me your suggestions for improvement?