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Input common-mode voltage range of AD9248

Question asked by ysuzuki on Aug 16, 2015
Latest reply on Aug 25, 2015 by ysuzuki

Hello,

 

I have a question about input common-mode voltage range of AD9248.

 

In the page-5 of CN0320 circuit note, the common-mode voltage between ADRF6510 and AD9248 is 1.5 V and 3 V and 2.25V is recommended.

http://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0320.pdf

 

But the input common-mode voltage range of AD9248 is described in page-17 of the datasheet, and the range is 0.5V to 2.0V (@ vref=1.0V) .

   VCMmin = Vref/2 = 0.5V

   VCMmax = (AVDD+Vref)/2 = 2.0V

 

2.25V is out of common-mode voltage range of AD9248.

 

Could you please teach me why are there mis-match about common-mode voltage range ?

 

 

Best regards,

ysuzuki

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