71M6533/71M6534 Data Sheet
FDS_6533_6534_004
5.4.15 VREF and VBIAS
Table 79 shows the performance specifications for VREF and VBIAS. Unless otherwise specified,
VREF_DIS = 0.
Table 79: VREF Performance Specifications
Parameter
VREF output voltage, VREF(22)
VREF chop step
Condition
Ta = 22ºC
Min
Typ
Max
1.197
40
Unit
V
1.193
1.195
mV
VREF power supply sensitivity
V3P3A = 3.0 to 3.6 V
-1.5
100
1.5
mV/V
ΔVREF / ΔV3P3A
VREF_DIS = 1,
VREF = 1.3 to 1.7 V
VREF input impedance
VREF output impedance
VNOM definitiona
kΩ
CAL =1,
ILOAD = 10 µA, -10 µA
VNOM (T) = VREF(22) + (T − 22)TC1⋅10−6 + (T − 22)2 TC2⋅10−6
2.5
kΩ
V
If TRIMBGA and TRIMBGB are available (71M6533H/71M6534H)
γ = 0.1·TRIMBGB - 0.143·(TRIMM+0.5),
Definitions
TEMP − 500 ⋅TRIMBGA − 370000
22
ξ =
900
,
η = (56.2 – TRIMT)·0.55
VNOM temperature coefficients b
η+ 19γ - 0.065γξ +0.34ξ + 8.0
0.015γ - 0.0013ξ – 0.35
µV/ºC
TC1
TC2
µV/ºC2
VREF(T) deviation from VNOM(T)
VREF(T) −VNOM (T)
VNOM (T)
106
-15
+15
+40
PPM/ºC
max(T − 22 ,40)
If TRIMBGA and TRIMBGB are not available (71M6533/71M6534)
VNOM temperature coefficients:
TC1
TC2
3.18·(52.46-TRIMT)
µV/ºC
-0.444
µV/°C2
VREF(T) deviation from VNOM(T)
VREF(T) −VNOM (T)
VNOM (T)
106
-40
PPM/ºC
max(T − 22 ,40)
PPM/
year
VREF aging
±25
Ta = 25 °C
Ta = -40 °C to 85 °C
(-1%)
(-4%)
1.6
1.6
(+1%)
(+4%)
V
V
VBIAS Voltage
a This relationship describes the nominal behavior of VREF at different temperatures.
b
TEMP22 is the value read from the temperature sensor at 22°C.
108
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