DAC7718: Power Supply Rejection Ratio (PSRR)

Chris Lange

Prodigy 70 points

Part Number: DAC7718

In the datasheet it lists:

Power-supply rejection is 0.05 LSB with a condition of AVDD = +33V to +36V.

Can you explain what that specification/condition means?

over 6 years ago

0 Uttam Sahu over 6 years ago

TI__Genius 14220 points

Hi Chris,

Welcome to E2E and thank you for your query. The test condition means that when AVDD is varied from +33V to +36V, the output varies by 0.05 LSB in DC.

Hope that answers your question.

Regards,
Uttam Sahu
Applications Engineer, Precision DACs

0 Chris Lange over 6 years ago in reply to Uttam Sahu

Prodigy 70 points

Hi Uttam

Thanks for your reply. Your response confirms what I assumed - it was just that measurement/test condition seemed a bit unusual.

Do you have any data which might show PSRR vs. frequency? Specifically, ripple due to a switching supply (500kHz-1.5MHz range)?

I'm trying to determine if we need to supply the DAC with a linear regulator or if the output from our SMPS is adequate.

Chris

0 Uttam Sahu over 6 years ago in reply to Chris Lange

TI__Genius 14220 points

Hi Chris,

I understand your requirement. However, we don't have the PSRR vs frequency plot for this part.

Regards,
Uttam

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DAC7718: Power Supply Rejection Ratio (PSRR)