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ADAU 1701 CM pin, 47 or 10uf?

Question asked by MCastany on Feb 19, 2014
Latest reply on Feb 19, 2014 by ColemanR

Hi,

 

This question is about the CM pin (40) in the ADAU1701. Reading the datasheet (Page 13), on the CM pin description, they say you have to connect a 47uF decopuling cap:

 

"1.5 V Common-Mode Reference. Connect a 47 μF decoupling capacitor between this pin and ground to reduce crosstalk between the ADCs and DACs. (...)"

 

My surprise came when I saw in the evaluation board schematics (adn the board it self) that connected to CM pin there was a 10uF cap (with a decoupling 0.1uF).

 

Is there any reason for using one cap or another, or it's just an error in the datasheet?

 

Thank you,

 

Marti

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