In a Battery Charging application, i am using ADS8319 ADC from Texas Instruments for digitizing the charging voltage and current signal, and providing it to the Microcontroller via SPI interface. (Battery charging will be done via synchronous Buck converter running at 62.5kHz, and ADC's sampling frequency would be a few Hz considering its a battery charging application). I will be using 2 of these ADCs (one for current and one for voltage measurement) as its a single channel ADC. For reference signal to this ADC i will be using the reference voltage IC REF5050 from TI. Two of these IC's will be used to provide reference to the ADS8319 seperately.
If you see in ADS8319's data sheet at page 21 Figure 59 and at page 22 Figure 60, two different methods of interfacing this REF5050 with the ADS8319 have been used (one is using OPA365 as a buffer i guess, and the other one is interfaced directly with the ADC). However i couldn't find the significance of (using or not using) the OPA365.
So my question is, should i consider using this OPA365 in between the REF and ADC ICs ? Would it (using it or not using it) effect in my case ? Offcourse i'd find it easy NOT to use it (less work @ circuit design + less circuit cost). So i just want to know what effect does it (OPA365) have on the circuit (especially in my case) ?
Your helpful comments and suggestions would be appreciated.