LMX2572: Integrated LDO PSRR

Shuhei Goto

Expert 6590 points

Part Number: LMX2572

Hi team,

What is PSRR of integrated LDO?

Also, What is the VCO output variation relative to the supply voltage variation?

Best regards,

Goto

over 2 years ago

0 vicente flores prado over 2 years ago

TI__Mastermind 32152 points

Hi Goto,
Let me look into this.
I'll update you as soon as I get a response form Design - this is not a metric we seem to have for this device.

Regards,

Vicente

0 vicente flores prado over 2 years ago in reply to vicente flores prado

TI__Mastermind 32152 points

Hi Goto
What is the use case here? What kind of spurs(+offset frequencies) do you have in your supplies ?

Regards,

Vicente

0 Shuhei Goto over 2 years ago in reply to vicente flores prado

TI__Expert 6590 points

Hi Vicente,

Customer has not yet decided on specific power supply.
They will consider it once they know the PSRR of the integrated LDO.

Regards,

Goto

0 Andrea Vallenilla over 2 years ago in reply to Shuhei Goto

TI__Genius 11005 points

Hello Shuhei,

Due to the holidays, please expect a delay in our response.

0 vicente flores prado over 2 years ago in reply to Andrea Vallenilla

TI__Mastermind 32152 points

Hi Shuhei,
Design told me they will get back to me after New Years, thank you for understanding.

Regards,

Vicente

0 vicente flores prado over 2 years ago in reply to vicente flores prado

TI__Mastermind 32152 points

Hi Shuhei,
Here is the PSSR plot for the integrated LDO.

Regards,

Vicente

0 Shuhei Goto over 2 years ago in reply to vicente flores prado

TI__Expert 6590 points

Hi Vicente,

Thank you for sharing!

Regarding this graph, what is the difference between each line?

Also, could you provide me information of Frequency pushing please?

Best regards,

Goto

0 vicente flores prado over 2 years ago in reply to Shuhei Goto

TI__Mastermind 32152 points

Hi Shuhei,
The differences are due to corners - given this was simulated across PVT.
In regards to frequency pushing, our device have internal LDOs thus your output won't vary - the internal LDOs will regulate the supply voltage to ensure it stays constant.

Regards,

Vicente

Clock & timing

Clock & timing forum

LMX2572: Integrated LDO PSRR