Use of TL431 for voltage reference of AD7683

Hi,

I am interesting to use TL431 voltage reference to generate 5V to be used in Vref input of AD7683.

This voltage reference has low noise voltage enough for AD7683?

I am asking because many voltage reference devices inform noise voltage parameter, normally in a specific range of frequency and in micro volts.

For example, ADR435 device, from Analog: Low noise (0.1 Hz to 10.0 Hz): 3.5 µV p-p @ 2.5 V output.

Unfortunatelly, this information does not informed in the TL431 datasheet. I tried TI, OnSemi, etc...

Regards,

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  • I would not even consider the TL431 with a 16 bit ADC;  you are just throwing money away.

    The TL431 is a commodity reference, with 50 ppm/C tempco.  So after your temperature

    changes by 10 degrees, you have less than a 14 bit system.   There is a noise curve

    (fig 7) on the TI data sheet.   Integrate over your bandwidth.

    Depending on system cost target, look at the ADR3425 or the ADR4525 and everything

    in between.

    Harry

Reply
  • I would not even consider the TL431 with a 16 bit ADC;  you are just throwing money away.

    The TL431 is a commodity reference, with 50 ppm/C tempco.  So after your temperature

    changes by 10 degrees, you have less than a 14 bit system.   There is a noise curve

    (fig 7) on the TI data sheet.   Integrate over your bandwidth.

    Depending on system cost target, look at the ADR3425 or the ADR4525 and everything

    in between.

    Harry

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