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ADRV9002 Power supplies sequencement

Hello,

When looking at the ADRV9002 datasheet i can read : 

The ADRV9002 requires a specific power-up sequence to avoid
undesired power-up currents. The optimal power-on sequence
requires VDD_1P0 to power up first. The VDDA_1P3 and
VDDA_1P8 supplies must then power up after the VDD_1P0 supply.

However, when looking at the evaluation board schematic (page 9), the ADP5056 has no sequencement at all. All 4 channels enable are tied to a single net called ADP5056_EN.

Could you please clarify this point? what should i do?

Thanks.

Cyril.

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  • Hi Cyril,

    As you've stated, the ADRV9002 devices requires a specific power-on sequence to avoid undesired power-up currents and subsequent damage to the part. On the evaluation board, we use the ADP5056 to control our power-up sequence. If you take a look at the datasheet for the ADP5056, available at https://www.analog.com/en/products/adp5056.html, you'll note that we control the power on sequence by determining the correct resistor values to tie to the control pins of the device. This operation is described in detail under the Theory Of Operation - Sequence Mode section of the datasheet.

    I hope this clarifies everything for you! Do follow up if you have any more questions.

    Best Regards,

    Oisín.

Reply
  • Hi Cyril,

    As you've stated, the ADRV9002 devices requires a specific power-on sequence to avoid undesired power-up currents and subsequent damage to the part. On the evaluation board, we use the ADP5056 to control our power-up sequence. If you take a look at the datasheet for the ADP5056, available at https://www.analog.com/en/products/adp5056.html, you'll note that we control the power on sequence by determining the correct resistor values to tie to the control pins of the device. This operation is described in detail under the Theory Of Operation - Sequence Mode section of the datasheet.

    I hope this clarifies everything for you! Do follow up if you have any more questions.

    Best Regards,

    Oisín.

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