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AD9742 External voltage reference

Question asked by johnuk on May 31, 2013
Latest reply on May 31, 2013 by johnuk

Am I correct i thinking that I cannot use an external voltage reference with an AD9742ACPZ as the REFLO signal is not available with this LFCSP_WQ package? Whereas the REFLO signal is available with the AD9742ARZ TSSOP package.

 

My reason for wishing to use an external reference is that the intenal voltage reference is specified as 1.14 to 1.26v (i.e. +- 6%), whereas an external reference such as an AD1580A is specified as 1.215 to 1.235 (i.e. +-1%) and the AD1580B is specified as 1.224 to 1.226(i.e 0.1%).

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