Datasheet

71M6533/G/H and 71M6534/H Data Sheet FDS_6533_6534_004
114 Rev 2
6.4.15 VREF and VBIAS
Table 84 shows the performance specifications for VREF and VBIAS. Unless otherwise specified,
VREF_DIS = 0.
Table 84: VREF Performance Specifications
Parameter
Condition
Min
Typ
Max
Unit
VREF output voltage, VREF(22)
Ta = 22ºC
1.193
1.195
1.197
V
VREF chop step
40
mV
VREF power supply sensitivity
ΔVREF / ΔV3P3A
V3P3A = 3.0 to 3.6 V -1.5 1.5 mV/V
VREF input impedance
VREF_DIS = 1,
VREF = 1.3 to 1.7 V
100 kΩ
VREF output impedance
CAL =1,
ILOAD = 10 µA, -10 µA
2.5 kΩ
VNOM definition
3
626
102)22(101)22()22()(
−−
⋅−+⋅−+= TCTTCTVREFTVNOM
V
If TRIMBGA and TRIMBGB are available (71M6533G/H, 71M6534H)
Definitions
4
γ = 0.1·TRIMBGB - 0.143·(TRIMM+0.5),
900
370000500
22
−⋅−
=
TRIMBGATEMP
ξ
,
η = (56.2 – TRIMT)·0.55
VNOM temperature coefficients
3
TC1
TC2
η+ 19γ - 0.065γξ +0.34ξ + 8.0
0.015γ - 0.0013ξ – 0.35
µV/ºC
µV/ºC
2
VREF(T) deviation from
VNOM(T)
)40,22max(
10
)(
)()(
6
−
−
TTVNOM
TVNOMTVREF
-15
1
+15
1
PPM/ºC
If TRIMBGA and TRIMBGB are not available (71M6533, 71M6534)
VNOM temperature coefficients:
TC1
TC2
3.18·(52.46-TRIMT)
-0.444
µV/ºC
µV/°C
2
VREF(T) deviation from VNOM(T)
)40,22max(
10
)(
)()(
6
−
−
TTVNOM
TVNOMTVREF
-40
1
+40
1
PPM/ºC
VREF aging
±25
PPM/
year
VBIAS Voltage
Ta = 25 °C
Ta = -40 °C to 85 °C
(-1%)
(-4%)
1.6
1.6
(+1%)
(+4%)
V
V
1
Guaranteed by design; not production tested.
2
This specification will be guaranteed and verified in production samples, but will be measured in
production only at DC.
3
This relationship describes the nominal behavior of VREF at different temperatures.
4
TEMP
22
is the value read from the temperature sensor at 22°C.