71M6534-IGT/F Maxim Integrated Products, 71M6534-IGT/F Datasheet - Page 70

• Manufacturer Part Number: 71M6534-IGT/F
• Description: IC ENERY METER 3PH 128K 120-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of 71M6534-IGT/F

• Mounting Style: SMD/SMT
• Package / Case: LQFP-120
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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%.
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%.
Figure 34
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
70
Parameter
VREF(T) deviation from VNOM(T)
Parameter
4
VREF
VREF
VREF(T) deviation from
VNOM(T)
VNOM
VNOM
Since TC1 and TC2 are given in µV/°C and µV/°C
(1.195V) has to be taken into account when transitioning to PPM/°C and PPM/°C
that PPMC = 26.84*TC1/1.195 and PPMC2 = 1374*TC2/1.195).
(
(
T
T
)
)
and
−
−
VNOM
VNOM
(
(
T
T
Figure 35
)
)
(
(
T
T
)
)
Table 51: VREF Definition for the Regular Accuracy Parts
max(
max(
Table 52: VREF Definition for the High-Accuracy Parts
show this concept graphically. The “box” from -18°C to +62°C reflects the fact
T
T
10
10
−
−
6
6
22
22
,
,
40
40
)
)
Condition
Condition
2
, respectively, the value of the VREF voltage
-40
-15
Min
Min
2
. This means
+40
+15
PPM/ºC
PPM/ºC
Typ
Typ
Rev 2