Is there a benefit of using the external reference on the AD5700? Can you drive the HART_OUT signal at a higher level if you use the external reference? Why would you use the external reference when an external reference is provided?
If your VCC supply is less than 2.7V then the internal 1.5V reference must be used. The external 2.5V reference can only be used if the VCC supply is >= 2.7V.
Apart from the above condition there is no performance benefit between the external and internal references.
The HART_OUT is always 500mVp-p regardless of which reference is used.
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