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ADS1220: Search for analog power supply ADS1220

Matteo
Prodigy 90 points
Part Number: ADS1220

Tool/software:

Hello,

I am looking for a supply with a Vout of 3.3 V for the AVDD of the ADS1220 ADC. Currently, I have Vin = 24 V, from which I derive the 3.3 V for the entire PCB using a switching converter.
The digital and analog grounds are not separated. For the AVDD of the microcontroller, which is not critical, I use a ferrite bead and the same 3.3 V for the digital part. However, for the external ADC, I  think it would be better to have a cleaner power source, or not?

Thank you,
Matteo

  • 0
    TI__Mastermind 45865 points

    Hi Matteo,

    Yes, a clean and low noise power supply is recommended for the standalone ADC, especially AVDD. The ripple and noise on the AVDD power supply will lead to an error on your measurement.

    BR,

    Dale

  • 0 in reply to Dale Li
    Prodigy 90 points

    Hi Dale,

    Thank you for your reply.

    Can you recommend me an LDO for AVDD (ADS1220)?
    I want to power the analog section with 3.3 V.
    Since I only need to power this ADC, a voltage reference or an ultra low dropout regulator might also be suitable. Could I potentially use the 3.3 V for DVDD as a source for the regulator?

    Best regards,
    Matteo