71M6541D Datasheet, PDF (148/166 Pages) Maxim Integrated Products – 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs

71M6541D/F/G and 71M6542F/G Data Sheet
6.4.14 VREF
Table 109 shows the performance specifications for the ADC reference voltage (VREF).
Table 109: VREF Performance Specifications
Parameter
VREF output voltage,
VREF(22)
VREF output voltage,
VREF(22)
VREF output impedance
VREF power supply sensitivity
ΔVREF / ΔV3P3A
VREF input impedance
VREF chop step, trimmed
VNOM definition (see note 2)
Condition
T_A = 22 ºC
Min
1.193
Typ
1.195
Max
1.197
PLL_FAST=0
1.195
VREF_CAL = 1,
ILOAD = 10 µA, -10 µA
3.2
V3P3A = 3.0 to 3.6 V
-1.5
1.5
VREF_DIS = 1,
VREF = 1.3 V to 1.7 V
100
VREF(CHOP=01) −
VREF(CHOP=10)
-10
0
10
VNOM (T ) = VREF(22) + (T − 22)TC1+ (T − 22) ² TC2
Unit
V
V
kΩ
mV/V
kΩ
mV
V
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
VNOM (T )
62
-40
+40 ppm/°C
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.