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參數(shù)資料
| 型號： | MAX1478 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1% Accurate, Digitally Trimmed,Rail-to-Rail Sensor Signal Conditioner |
| 中文描述： | 1%精確度、數(shù)字校準(zhǔn)、滿擺幅傳感器信號調(diào)理器 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 210K |
| 代理商： | MAX1478 |
Offset TC Compensation
The offset voltage at T1 was previously set to 0.5V;
therefore, any variation from this voltage at T2 is an
offset TC error. Perform the following steps:
1) Measure the offset voltage at T2.
2) Use the following equation to compute the correc-
tion required:
Note:
CurrentOFFTC COEF is the current value
stored in the Offset TC DAC. If the Offset TC sign bit
(SOTC) is low, this number is negative.
3) Load this value into the Offset TC DAC.
4) If NewOFFTC COEF is negative, set the SOTC bit
low; otherwise, set it high.
Offset TC compensation is now complete.
Offset Calibration
At this point, the sensor should still be at temperature
T2. The final offset adjustment can be made at T2 or T1
by adjusting the Offset DAC (and optionally the offset
sign bit, SOFF) until the output (V
OUT(P
MIN
)
) reads 0.5V
at zero input pressure. Use the following procedure:
1) Set Offset DAC to zero (Offset COEF = 0).
2) Measure the voltage at OUT.
3) If V
OUT
is greater than the desired offset voltage
(0.5V in this example), set SOFF low; otherwise, set
it high.
4) Increase Offset COEF until V
OUT
equals the desired
offset voltage.
Offset calibration is now complete. Table 8 and Figure 9
compare an uncompensated input to a typical compen-
sated transducer output.
NewOFFTC COEF
CurrentOFFTC COEF -
( )
( )
4096 V
T - V
( )
( )
2.3 V
T - V
1
T2
OFFSET
OFFSET
BDRIVE
BDRIVE
=
1
M
1% Accurate, Digitally Trimmed,
Rail-to-Rail Sensor Signal Conditioner
______________________________________________________________________________________
15
Typical Uncompensated Input (Sensor)
Typical Compensated Transducer Output
Offset ..........................................................................±80% FSO
FSO................................................................................+15mV/V
Offset TC......................................................................-17% FSO
Offset TC Nonlinearity..................................................0.7% FSO
FSO TC.........................................................................-35% FSO
FSO TC Nonlinearity.....................................................0.5% FSO
Temperature Range...........................................-40°C to +125°C
V
OUT
...................................................Ratiometric to V
DD
at 5.0V
Offset at +25°C ......................................................0.500V ±5mV
FSO at +25°C .........................................................4.000V ±5mV
Offset Accuracy Over Temp Range ...........±28mV (±0.7% FSO)
FSO Accuracy Over Temp Range..............±20mV (±0.5% FSO)
Table 8. MAX1478 Calibration and Compensation
-20
-10
10
0
20
30
-50
0
50
100
150
UNCOMPENSATED SENSOR ERROR
TEMPERATURE (
°
C)
E
OFFSET
FSO
-0.8
-0.6
0.4
-0.2
-0.4
0
0.2
0.6
0.8
-50
0
50
100
150
COMPENSATION TRANSDUCER ERROR
TEMPERATURE
°
(C)
E
OFFSET
FSO
Figure 9. Comparison of an Uncalibrated Sensor and a Temperature-Compensated Transducer
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