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參數資料
| 型號： | MAX1460CCM |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Low-Power, 16-Bit Smart ADC |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PQFP48 |
| 封裝： | TQFP-48 |
| 文件頁數： | 15/20頁 |
| 文件大?。?/td> | 204K |
| 代理商： | MAX1460CCM |
M
Low-Power, 16-Bit Smart ADC
______________________________________________________________________________________
15
where:
Equation (5a)
Equation(5b)
Equation (5c)
Equations 4a and 4b form a system of two linear equa-
tions and two unknowns, G
1
and G
2
. Solve for G
1
and
G
2
. Equation 1 can now be readily solved for the last
unknown, Gain.
Arithmetic manipulation can magnify measurement
errors and noise. Quantization of the calibration coeffi-
cients is another reason to consider adjusting the Gain
and D
OFF
coefficients. To do this, load the MAX1460
registers with the calculated coefficients Gain, G
1
, G
2
,
Of
0
, Of
1
, Of
2
, and D
OFF
. Assuming the oven is still at
temperature C and the S sensor excitation is still
applied, measure the output D
CS
. Change to the L sen-
sor excitation, and measure D
CL
. Compute the new
Gain coefficient using equation 6. Remeasure D
CL
, and
compute the new D
OFF
coefficient, given by equation
7.
Equation (6)
Equation (7)
The final calibration coefficients may now be written
into the MAX1460 EEPROM. The unit is now ready for
final test.
D
D
D
D
OFFnew
OFF
L
CL
=
+
GAIN
Gain
D
D
D
D
new
L
S
CS
CL
=
Y
D
D
Signal
Of
Of T
Of T
CS
S
OFF
CS
0
=
+
+
+
Y
D
D
Signal
Of
Of T
Of T
BS
S
OFF
BS
0
=
+
+
+
Y
D
D
Signal
Of
Of T
Of T
AS
S
OFF
AS
0
=
+
+
+
-10
-4
-6
-8
0
-2
8
6
4
2
FSO
10
0
10
20
30
40
50
60
70
UNCOMPENSATED SENSOR ERROR
TEMPERATURE (
°
C)
E
OFFSET
Figure 6. Sensor Characteristics Before Compensation
-0.20
-0.10
-0.15
0
-0.05
0.15
0.10
0.05
0.20
0
20
10
30
40
50
60
70
COMPENSATED TRANSDUCER ERROR
TEMPERATURE (
°
C)
E
FSO
OFFSET
Figure 7. Compensated Sensor/MAX1460 Pair
AGND
AMP-
AMP+
OUT
UNFILTERED
BITSTREAM
FILTERED
ANALOG
OUTPUT
R
D1
10k
R
D2
10k
AMPOUT
C
F
1
μ
F
R
F
500k
R1
500k
MAX1460
OP AMP
V
DD
Figure 8. Filtering the Output DAC
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