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?

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    •  Analog Employees 
    on Apr 5, 2011 7:50 PM over 9 years ago

    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.

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  • 0
    •  Analog Employees 
    on Apr 5, 2011 7:50 PM over 9 years ago

    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.

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