MAX1457 Maxim, MAX1457 Datasheet - Page 11

• Manufacturer Part Number: MAX1457
• Description: 0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compensation
• Manufacturer: Maxim

Figure 8. Comparison of an Uncompensated Sensor (left) and a Compensated Transducer (right)
Table 1. MAX1457 Sensor Calibration and Compensation
Offset . . . . . . . . . . . . . . . . . . . . . . . . . .±100% FSO
FSO . . . . . . . . . . . . . . . . . . . . . .20mV/V to 30mV/V
Offset TC . . . . . . . . . . . . . . . . . . . . . . . . .20% FSO
Offset TC Nonlinearity . . . . . . . . . . . . . . . .4% FSO
FSO TC . . . . . . . . . . . . . . . . . . . . . . . . . .-20% FSO
FSO TC Nonlinearity . . . . . . . . . . . . . . . . . .5% FSO
Typical Uncompensated Input (Sensor)
______________________________________________________________________________________
for Piezoresistive Sensor Compensation
UNCOMPENSATED SENSOR TEMPERATURE ERROR
160
120
-10
-20
80
40
30
20
10
0
0
UNCOMPENSATED RAW SENSOR OUTPUT
-50
0
T
17mV V
A
= +25°C
20
0
OUT
TEMPERATURE (°C)
0.1%-Accurate Signal Conditioner
PRESSURE (kPa)
73mV
40
OFFSET
50
60
FSO
100
80
100
150
Temperature Range . . . . . . . . . . .-40°C to +125°C
V
Offset at +25°C . . . . . . . . . . . . . . .0.500V ± 200µV
FSO at +25°C . . . . . . . . . . . . . . . . .4.000V ±200µV
Offset Accuracy Over
Temperature Range . . . . . . . . . .±4mV (0.1% FSO)
FSO Accuracy Over
Temperature Range . . . . . . . . ..±4mV (0.1% FSO)
OUT
-0.05
-0.10
-0.15
0.15
0.10
0.05
Typical Compensated Transducer Output
5
4
3
2
1
0
0
-50
. . . . . . . . . . . . . . . .ratiometric to V
0
COMPENSATED TRANSDUCER ERROR
T
0.5V V
A
FSO
OFFSET
= +25°C
COMPENSATED TRANSDUCER
20
OUT
0
TEMPERATURE (°C)
PRESSURE (kPa)
4.5V
40
50
60
100
80
150
100
DD
at 5.0V
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