AD566x/4x/2x(R) -  Supply Voltages & On-chip Reference options

The AD5664R has two on-chip reference options available, 1.25V and 2.5V. What is the recommended supply voltage in each case?

  • 1)The on-chip reference is off on power up so a write is needed to enable the internal reference.

    2)There are 2 reference options:

    A) The 1.25V internal reference options have an output voltage range of 0V to 2.5V.

    B) The 2.5V internal referece options hves an output voltage range of 0V to 5V.

    Answer:

    The 1.25V internal reference option will work between a supply of 2.7V to 3.6V

    The 2.5V intefnal reference option will function between a supply of 4.5V to 5.5V.

    Note: If the voltage supplied is less than the expected output voltage, the output voltage is clamped by the supply voltage. For example,The expected output when programming full-scale with VDD=5.5V would be ~5V if you are using the 2.5V reference option. If VDD=4.5V,the output is clamped at 4.5V.

  • Hi Pradaic,

    In AD56x4R datasheet (Rev C.), it is said (External Reference chapter, p20) that "All devices (AD56x4R-3 and the AD56x4R-5) can be operated from a single 2.7 V to 5.5 V supply."

    Above you are stating that "The 1.25V internal reference option will work between a supply of 2.7V to 3.6V".

    Which is right?

    Could AD56x4R-3 uses +5V supply?

    My design uses AD5664R-3 and I connected its supply to +5V.

    Regards,

  • This question has been closed by the EZ team and is assumed answered.