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ADS7950 Vref for Electrical characteristics

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: ADS7950, ADS7230

Hello,

In the datasheet page 5 of ADS7950, Electrical characteristics is defined by "Vref = 2.5 V ± 0.1 V".
 
But ADS7230 is defined by "VREF = 5V"
There is not ± 0.1 V.
 
Why difference between these device of Vref for Electrical Characteristics ?
 
Best Regards,
Ryuji Asaka
  • 0
    Guru 20090 points
    Hello,
     
    Sorry for bothering you.
    But could you please kindly let me know the background about Vref?
     
     
    I think that this Vref reasons are as below.
     
    -Full-scale input span of Range 2 is "2* Vref≤VA"
     VA range is 2.7V to 5.25V.
     So, Vref=2.5V+0.1V
     
    -When Vref<2.4V , noise performance is reduced due to SNR degradation resulting from lowered signal range.
      So, Vref=2.5V-0.1V
     
    As these 2 reasons result , Electrical Characteristics is defined by Vref=2.5V±0.1V.
     
    Is my understanding correct ?
    If no please let me know this background.
     
    Best Regards,
    Ryuji Asaka