Also,
Why is a tantalum capacitor recommended for the capacitor between "CAP" and ground? Tantalum's have more ESR than ceramics, and a ceramic is (nowadays anyway) available in 2.2 uF. Is there a minimum amount of ESR that is required to prevent the internal buffer amplifier shown below (from the ADS8509 data sheet) from oscillating? If so, what is that minimum ESR value?
Ken