MAX1450
Low-Cost, 1%-Accurate Signal Conditioner
for Piezoresistive Sensors
Table 4. MAX1450 Calibration and Compensation
Typical Uncompensated Input (Sensor)
Typical Compensated Transducer Output
Offset......................................................................±80% FSO
FSO.............................................................................15mV/V
Offset TC.................................................................-17% FSO
Offset TC Nonlinearity.................................................1% FSO
FSO TC....................................................................-35% FSO
FSO TC Nonlinearity...................................................1% FSO
Temperature Range........................................-40°C to +125°C
VOUT..............................................Ratiometric to VDD at 5.0V
Offset at +25°C ...................................................0.500V ±5mV
FSO at +25°C......................................................4.000V ±5mV
Offset Accuracy Over Temp. Range..........±60mV (1.5% FSO)
FSO Accuracy Over Temp. Range.............±60mV (1.5% FSO)
UNCOMPENSATED SENSOR ERROR
30
20
10
FSO
0
OFFSET
-10
-20
-50
0
50
100
150
TEMPERATURE (°C)
COMPENSATED TRANSDUCER ERROR
0.8
0.6
0.4
FSO
0.2
0
-0.2
-0.4
OFFSET
-0.6
-0.8
-50
0
50
100
150
TEMPERATURE °(C)
Figure 6. Comparison of an Uncalibrated Sensor and a Temperature-Compensated Transducer
Chip Information
TRANSISTOR COUNT: 1364
SUBSTRATE CONNECTED TO VSS
www.maximintegrated.com
Maxim Integrated │ 10