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MK64FX512 : VREF_OUT voltage drift

Question asked by koichi sakagami on Dec 4, 2015
Latest reply on Dec 6, 2015 by xiangjun.rong

Dear community,

 

We consider the VREF_OUT voltage drift.

 

In DataSheet Table 36. VREF full-range operating behaviors ,
It is described that VOUT = 1.198 V (max);( Vout Voltage reference output with factory trim at nominal VDDA and temperature= 25 °C ) .

  Vtdrift = 15mV ( max ) ;(Vmax -Vmin across the full temperature range)
  Vvdrift = 2mV ( max );(Vmax -Vmin across the full voltage range)

 

Next,
Table 38. VREF limited-range operating behaviors ,
It is described that VOUT = 1.225 V (max);temperature= 0 ~ 50 °C

 

We calculated a max case value for voltage drift.
1.198 + 0.015 + 0.002 = 1.215

 

[Question]
Why  is the max case value ( we  calculated) smaller than Table 38 value ?
1.215 < 1.225

 

 

 

Best Regards,
Koichi Sakagami

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