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TLA2528: Can it bu used with AVDD > DVDD? datasheet says no, forum question suggests maybe

Prodigy 30 points

Replies: 3

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Part Number: TLA2528

Hello,

I am considering TLA2528 for a new design because it has separate AVDD and DVDD supplies.

On this topic, datasheet says:

AVDD > 2.35V

DVDD > 1.65V

However, later in the doc it is mentioned that input voltage is limited to DVDD (from ESD protection apparently). I found a forum question which suggest using TLA2528 because it would work with AVDD > DVDD.

Could someone confirm if the datasheet is right or if it is an error and it can be used with AVDD=3.6V annd DVDD=1.8V ?

  • After re-reading my post, apart from a couple of typos I am not sure I am really clear. I want to use analog input AIN in the range [0-AVDD] despite having AVDD > DVDD.

  • In reply to Christophe CURIS:

    Hello Christophe,

    Yes, the AIN pins can range from 0V to AVDD, independent of the voltage on DVDD.

    The input pins, AINx/GPIOx, are all referred to the AVDD supply.  Both the ABS MAX table, as well as the specification section, refer these inputs to AVDD.

    Also, I looked through the datasheet, and could not find the error.  Could you point out the specific section where the datasheet refers the inputs to DVDD?

    Thank you,

    Regards,
    Keith Nicholas
    Precision ADC Applications

  • In reply to Keith Nicholas:

    Hello Keith,

    I confirm I see the same thing in the datasheet. I was not able to find in my history the link to the wrong datasheet (I think it was from either from Digikey or Mouser, but the 2nd properly directs to TI.com and the 1st seems to have no link for this ADC). Sorry for the noise.

    Best regards,

    Christophe.

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