When using an ADI DAC, is it best to recommend an internal or external reference?
The recommended approach when using either the ADV7123 or ADV7125 is to use an external reference (as per datasheet) e.g. AD1580.
Attached is a reference schematic - also covered in the datasheet.
What is the recommended connection if we want to use the internal reference instead of an external one?
Please refer to the Internal Reference section in the datasheet which states that a 0.1uF capacitor should be connected between the the Vref pin and the analog supply. Also a 0.1uF capacitor should be connected between the the COMP pin and the analog supply.
The external reference provides for better performance at the higher graphics speeds.
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