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.
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.
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.