AD2S1210 excitation buffer question

Question

Hello, 
 we are using AD2S1210 eval board for the prototype and it seems to work very well. 
 now, we are looking into making the circuit for our custom board. 
 going through CN0276.pdf, CN-0192.pdf, we noticed that the recommended buffer driver circuit always involve a BJT. 
 on our end, we would like to use FET instead. 
 Can you please point out any particular reason why BJT is used instead of FET? 
 what is the downside of using FET as push-pull circuit? maybe we are missing something. 
 Thanks and Best Regards, 
 Henry

@skowalik · Accepted Answer

Henry, 
 Unfortunately I did not design the output stage on the evaluation board so I don't have intimate knowledge of why the original designer chose to go bipolar instead of using MOS but I fundamentally don't see an issue with using FETs for the output stage. The only thing I can think of is that ultimately BIPOLAR devices may have allowed for a smaller more cost effective design with respect to achieving the desired current drive. I will see if I can track down a more definitive answer for you and respond if I find out anything of interest. 
 Sean)

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AD2S1210 excitation buffer question