71M6543F Datasheet, PDF (143/157 Pages) Maxim Integrated Products – Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation

71M6543F/H and 71M6543G/GH Data Sheet
6.4.14 71M6543 VREF
Table 104 shows the performance specifications for the 71M6543 ADC reference voltage (VREF).
Table 104: 71M6543 VREF Performance Specifications
Parameter
Condition
Min Typ Max Unit
VREF output voltage,
VREF(22)
VREF output voltage,
VREF(22)
T_A = 22 ºC
PLL_FAST=0
1.193 1.195 1.197
V
1.195
V
VREF chop step, trimmed
VREF(CHOP=01) −
VREF(CHOP=10)
-10
VREF power supply sensitivity
ΔVREF / ΔV3P3A
V3P3A = 3.0 to 3.6 V
-1.5
VREF input impedance
VREF_DIS = 1,
VREF = 1.3 V to 1.7 V
100
10
mV
1.5 mV/V
kΩ
VREF output impedance
VREF_CAL = 1,
ILOAD = 10 µA, -10 µA
3.2
kΩ
VNOM definition (see note 2) VNOM (T ) = VREF (22) + (T − 22)TC1+ (T − 22) ² TC2
V
If temperature characterization trim information is available (71M6543H and 71M6543GH, 0.1%)
VNOM temperature
coefficients:
TC1 =
35.091+0.01764∙TRIMT+1.587∙(TRIMBGB − TRIMBGD)
µV/°C
TC2 =
−0.557 − 2.8 ∙ 10^−4 ∙ 𝑇𝑅𝐼𝑀𝑇
µV/°C²
VREF(T) deviation from
VNOM(T) (see note 1):
VREF (T ) − VNOM (T ) 10⁶
-10
+10 ppm/°C
VNOM (T )
62
If temperature characterization trim information is not available (71M6543F and 71M6543G , 0.5%)
VNOM temperature
coefficients:
TC1 =
TC2 =
275 − 4.95 ⋅TRIMT
−0.557 + 0.00028 ⋅TRIMT
µV/°C
µV/°C²
VREF(T) deviation from
VNOM(T) (see note 1):
VREF (T ) − VNOM (T ) 10⁶
-40
+40 ppm/°C
VNOM (T )
62
VREF aging
±25
ppm/
year
Notes:
1. Guaranteed by design; not production tested.
2. This relationship describes the nominal behavior of VREF at different temperatures, as
governed by a second order polynomial of 1^st and 2^nd order coefficients TC1 and TC2.
3. For the parameters in this table, unless otherwise specified, VREF_DIS = 0, PLL_FAST=1
v1.2
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