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Question about AD9229 A/D converter

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A/D converter question

Hi,

I was looking at AD9229 analog to digital converter chip and it says

"The AD9229 has a stable and accurate reference voltage on chip,
which sets the full-scale voltage at the analog input channels."

Does this mean this acts a PGA for the ADC because I could'nt find a gain amplifier. Thanks :!:
 

Re: A/D converter question

"The AD9229 has a stable and accurate reference voltage on chip,
which sets the full-scale voltage at the analog input channels."
this meas that the A/D chip include an accurate bandgap reference.
Generally the A/D converter chip have a PGA internally.
 

Re: A/D converter question

Never confuse the reference of the ADC with its input PGA -- they serve completely different purpose. The PGA can be done in several ways, you may not be able to find it at the input of the ADC since it can also be done digitally as long as the ADC has enough dynamic range.
 

Re: A/D converter question

Full scale means the maximun input the ADC can take from your signal source, which is set by the internal reference voltage.

PGA can be internal or external. It helps to make the signal size to fit the ADC full scale.
 

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