Datasheet

FDS_6533_6534_004 71M6533/G/H and 71M6534/H Data Sheet
Rev 2 71
Figure 34: Error Band for VREF over Temperature (Regular-Accuracy Parts)
Figure 35: Error Band for VREF over Temperature (High-Accuracy Parts)
4.1.1 Temperature Compensation for VREF
The bandgap temperature is used to digitally compensate the power outputs for the temperature dependence
of VREF, using the CE register GAIN_ADJ (internal temperature compensation). Since the band gap amplifier
is chopper-stabilized via the CHOP_E[1:0] field, the most significant long-term drift mechanism in the voltage
reference is removed.
In internal temperature compensation mode, the CE applies the following formula to determine the GAIN_ADJ
value. In this formula TEMP_X is the deviation from nominal or calibration temperature expressed in multiples
of 0.1 °C:
23
2
14
2
2
_
2
_
16385_
PPMCXTEMPPPMCXTEMP
ADJGAIN
⋅
+
⋅
+=
-2800
-2400
-2000
-1600
-1200
-800
-400
0
400
800
1200
1600
2000
2400
2800
-40 -20 0 20 40 60 80
Error Band (PPM) over Temperature (°C)
±40 PPM/°C
±40 PPM/°C
-1200
-800
-400
0
400
800
1200
-40 -20 0 20 40 60 80
Error Band (PPM) over Temperature (°C)
±15 PPM/°C
±15 PPM/°C