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ADS7263: power supply for DVDD 3.3V and AVDD 3.3V or 5V?

Part Number: ADS7263
Other Parts Discussed in Thread: UA78


The datasheet mentions the UA7805 as possible LDO option but it is not available in 3.3V.
It is not 100% sure but the options could be:

DVDD 3.3V and AVDD 5V

The assumption is that the Vin for the LDO would be between 7V and 5V.

-What low cost alternative to UA7805 do you recommend for 3.3V?
Here is a TI.COM comparison table.
What do you recommend from this table?,TLV752,TLV759P,UA78,LM317&cols=o1,p182,p451max,p634min,p634max,p238min,p238max,p1154,p1128,p2954,p236typ,p2277,p1130,p3316,p2739min,p1811,p2192,p1530,p985typ,p1192&lang=en

-SBAS523D page 8 gives 117mW as highest power consumption.
Is it truly the worth case scenario under the condition listed?
Is for example the power up higher than this? What extra power margin would you recommend for the supply?

Thanks in advance!


  • Hello AnBer,

    Thank you for your post.

    The valid supply ranges for AVDD and DVDD vary depending on the clock mode.

    The power consumption listed as the maximum is provided with some amount of margin in mind, so I would not expect to exceed this number under the specified conditions. 

    The UA7805 is quite an old part. Slight smile I'm sure it would work fine, but there are certainly plenty of alternatives. The TLV76x devices are promoted on the UA78 product page, so I would start by looking into those. 100 mA should be plenty of output current for the ADS7263.