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71M6545/71M6545H Data Sheet
6.4.11 71M6545/H VREF
Table 90 shows the performance specifications for the 71M6545/H ADC reference voltage (VREF).
Table 90: 7 1M6545/H        VREF Performance Specifications
Parameter
VREF output voltage,
VREF(22)
VREF output voltage,
VREF(22)
VREF chop step, trimmed
VREF power supply sensitivity
ΔVREF / ΔV3P3A
Condition
T A = 22 oC
PLL_FAST =0
VREF(CHOP=01) ?
VREF(CHOP=10)
V3P3A = 3.0 to 3.6 V
Min
1.193
-10
-1.5
Typ
1.195
1.195
Max
1.197
10
1.5
Unit
V
V
mV
mV/V
VREF input impedance
VREF output impedance
VREF_DIS = 1,
VREF = 1.3 V to 1.7 V
VREF_CAL = 1,
I LOAD = 10 μA, -10 μA
100
3.2
kΩ
kΩ
VNOM definition (see note 2)
VNOM ( T ) = VREF ( 22 ) + ( T ? 22 ) TC 1 + ( T ? 22 ) 2 TC 2
V
If temperature characterization trim information is available (71M6545H)
? 0.557 ? 2.8 ? 10 ?4 ? ??????????
VNOM temperature
coefficients:
TC1 =
TC2 =
VREF(T) deviation from
VNOM(T) (see note 1):
VREF ( T ) ? VNOM ( T ) 10 6
VNOM ( T )
62
35.091+0.01764 ?TRIMT +1.587 ? ( TRIMBGB ? TRIMBGD )
-10 +10
μV/°C
μV/°C 2
ppm/°C
If temperature characterization trim information is not available (71M6545H)
VNOM temperature
coefficients:
TC1 =
TC2 =
275 ? 4 . 95 ? TRIMT
? 0 . 557 ? 0 . 00028 ? TRIMT
μV/°C
μV/°C 2
VREF(T) deviation from
VNOM(T) (see note 1):
VREF ( T ) ? VNOM ( T ) 10 6
VNOM ( T )
62
VREF aging
-40
± 25
+40
ppm/°C
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
120
v2
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