71M6545 Datasheet, PDF (121/134 Pages) Maxim Integrated Products – Four-Quadrant Metering, Phase Metrology Processors Flash/RAM Size

PDS_6545_009
Data Sheet 71M6545/H
6.4.11 71M6545/H VREF
Table 90 shows the performance specifications for the 71M6545/H ADC reference voltage (VREF).
Table 90: 71M6545/H VREF Performance Specifications
Parameter
Condition
Min Typ Max
VREF output voltage,
VREF(22)
VREF output voltage,
VREF(22)
T_A = 22 ºC
PLL_FAST=0
1.193 1.195 1.197
1.195
VREF chop step, trimmed
VREF(CHOP=01) −
VREF(CHOP=10)
-10
10
VREF power supply sensitivity
ΔVREF / ΔV3P3A
V3P3A = 3.0 to 3.6 V
-1.5
1.5
VREF input impedance
VREF_DIS = 1,
VREF = 1.3 V to 1.7 V
100
VREF output impedance
VREF_CAL = 1,
ILOAD = 10 µA, -10 µA
3.2
VNOM definition (see note 2) VNOM (T ) = VREF (22) + (T − 22)TC1+ (T − 22) ² TC2
If temperature characterization trim information is available (71M6545H, 0.1%)
VNOM temperature
coefficients:
TC1 =
35.091+0.01764∙TRIMT+1.587∙(TRIMBGB − TRIMBGD)
Unit
V
V
mV
mV/V
kΩ
kΩ
V
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
VNOM (T )
62
-10
+10 ppm/°C
If temperature characterization trim information is not available (71M6545H , 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
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
v1.0
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