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TLV320AIC3100: Power Supply Recommendations and Layout

Part Number: TLV320AIC3100

Hi,

We received some questions about TLV320AIC3100 from a customer.

Q1. What does it mean 'stabilized' in Power Supply Recommendations of datasheet page 123? Does it mean the power supply is in voltage range of the Recommended Operating Conditions? Is there not only the voltage but also the demand of time?

Q2. Are there time limits between each power sequences? In worst case, it spend 5 seconds to power up by their software.

Q3. Is there a time limit until reset release after all power up?

Q4. Why is DVSS connected to the Analog Ground Plane in Layout Example of datasheet page 124?


Best regards,

Akio Ito

  • Hi, Ito-san,

    Please refer to below comments:

    1- A power supply is considered stable once the ramping process is over and the supply voltage is within the range of recommended operating conditions.

    2-  There should be no issue with the power up sequence as long as the part is held in Reset state. 

    3- There is no time limit for this.

    4- This is done to give DVSS pin a closer path to ground. Analog and digital grounds are connected to each other in one point of the PCB close to the IC so there is no issue in connecting DVSS to analog ground plane. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • Hello, Diego-san,

    I received an additional question from the customer.
    Q5. Though there is a description of 'Power-Supply Sequence' on page 21 to 22 of datasheet, why had 'Power Supply Recommendation' been described again on page 123?

    Best regards,

    Akio Ito
  • Hello, Diego-san,

    I quoted the following sentences from Audio Converters Wiki as a description of 'unexpected conditions and behaviors' in datasheet to our customer.

    'These events may produce digital noise on the analog side. In most extreme events, there could be risk of distortion on the ADC output.'

    Our customer asked again whether these events is temporary or continuous. I think these events are temporary. Is my understanding correct?

    Best regards,

    Akio Ito

  • Ito-san,

    Regarding your question about the datasheet, pages 21 and 22 describe the power supply sequence as part of Feature Description section. Page 123 is part of the Power Supply Recommendations section and it provides more details about this sequence.

    Finally, the events that you mentioned in your last post can be temporary or continuous. These are unexpected conditions and behavior. So, these events are out of the codec normal operation. I strongly suggest to follow all the datasheet recommendations in order to guarantee a correct codec behavior.

    Best regards,
    Luis Fernando Rodríguez S.