About AD9231 Reference

Question

Hi, 
 I would like to use AD9231. But,I have three question. 
 #1 When I use the outside Ref of AD9231with ADI product, What is highly precise, available Ref? 
 #2 ADI product does not have highly precise Ref in 1.0VRef output, 　 in the case of 1.0VRef in using outside Ref , how should I make a circuit? 
 #3 For example, using ADR4520, can you make Ref of AD9231? 
 best regards 
 yuya

ADIApproved · Accepted Answer

Hi Yuya-san, 
 Thank you for your interest in AD9231. 
 The ADR4520 looks to be an excellent reference with a low temperature coefficient and low noise, but unfortunately its output voltage is not 1V. 
 One candidate is the ADR130. Figure 33 in the ADR130 datasheet ( http://www.analog.com/media/en/technical-documentation/data-sheets/ADR130.pdf ) shows how it is configured in 1V output mode. The output of the reference can be directly connected to the VREF pin of AD9231. In this mode the SENSE pin of the AD9231 must be connected to AVDD. 
 I'll check with the Reference Group to respond here if they have any additional suggestions. 
 Thank you. 
 Doug)

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About AD9231 Reference