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71M6533/G/H and 71M6534/H Data Sheet
FDS_6533_6534_004
Since TC1 and TC2 are given in μV/°C and μV/°C 2 , respectively, the value of the VREF voltage
(1.195V) has to be taken into account when transitioning to PPM/°C and PPM/°C 2 . This means
that PPMC = 26.84*TC1/1.195 and PPMC2 = 1374*TC2/1.195).
Close examination of the electrical specification (see Table 51) for the parts with regular accuracy reveals
that the achievable deviation is not strictly ±40 PPM/°C over the whole temperature range: Only for
temperatures for which T-22 > 40 (i.e. T > 62°C) or for which T-22 < -40 (i.e. T < -18°C), the data sheet
states ±40 PPM/°C. For temperatures between -18°C and +62°C, the error should be considered
constant at ±1,600 PPM, or ±0.16%.
Similar considerations apply to the high-accuracy parts (see Table 52), where the error around the
calibration temperature should be considered constant at ±600 PPM, or ±0.06%.
Parameter
Condition
Min
Typ
VREF(T) deviation from VNOM(T)
VREF ( T ) ? VNOM ( T )
VNOM ( T )
10 6
max( T ? 22 , 40 )
-40
+40
PPM/oC
Table 51: VREF Definition for the Regular Accuracy Parts
Parameter
4 VREF(T) deviation from
VNOM(T)
VNOM ( T )
VREF ( T ) ? VNOM ( T ) 10 6
max( T ? 22 , 40 )
Condition
-15
Min
+15
Typ
PPM/oC
Table 52: VREF Definition for the High-Accuracy Parts
Figure 34 and Figure 35 show this concept graphically. The “box” from -18°C to +62°C reflects the fact
that it is impractical to measure the temperature coefficient of high-quality references at small temperature
excursions. For example, at +25°C, the expected error would be ±3°C * 40 PPM/°C, or just 0.012% for the
regular-accuracy parts..
The maximum deviation of ±2520 PPM (or 0.252%) for the regular-accuracy parts is reached at the
temperature extremes. If the reference voltage is used to measure both voltage and current, the identical
errors of ±0.252% add up to a maximum Wh registration error of ±0.504%.
The maximum deviation of ±945 PPM (or 0.0945%) for the high-accuracy parts is reached at the
temperature extremes. If the reference voltage is used to measure both voltage and current, the identical
errors of ±0.0945% add up to a maximum Wh registration error of ±0.189%.
70
Rev 2
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