參數(shù)資料
型號(hào)： 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(hào)調(diào)理器
文件頁數(shù)： 14/20頁
文件大小： 210K
代理商： MAX1478
M
coarse offset TC adjustment is required, use the follow-
ing equation:
where OTC is the sensor offset TC error as a ppm/°C of
OUTFSO (Table 6),
T is the operating temperature
range in °C, and OFFTC COEF is the numerical decimal
value to be loaded into the DAC. For positive values,
set the OFFTC sign bit high; for negative values, set the
OFFTC sign bit low. If the absolute value of the OFFTC
COEF is larger than 4096, the sensor has a very large
offset TC error that the MAX1478 is unable to completely
correct.
FSO Calibration
Perform FSO calibration at room temperature with a full-
scale sensor excitation.
1) Set FSOTC COEF to 1000.
2) At T1, adjust FSO DAC until V
BDRIVE
is about 2.5V.
3) Adjust Offset DAC (and OFFSET sign bit, if needed)
until the T1 offset voltage is 0.5V (see
OFFSET
Calibration
section).
4) Measure the full-span output (measuredV
FSO
).
5) Calculate the ideal bridge voltage, V
BIDEAL
(T1),
using the following equation:
( )
=
Note:
If V
BIDEAL
(T1) is outside the allowable bridge
voltage swing of (V
SS
+ 1.3V) to (V
DD
- 1.3V), readjust
the PGA gain setting. If V
BIDEAL
(T1) is too low,
decrease the PGA gain setting by one step and return
to Step 2. If V
BIDEAL
(T1) is too high, increase the PGA
gain setting by one step and return to Step 2.
6) Set V
BIDEAL
(T1) by adjusting the FSO DAC.
7) Readjust Offset DAC until the offset voltage is 0.5V
(see
OFFSET Calibration
section).
Three-Step FSOTC Compensation
Step 1
Use the following procedure to determine FSOTC
COEF; four variables, A–D, will be used:
1) Name the existing FSO DAC coefficient A.
2) Change FSOTC DAC to 3000.
3) Adjust FSO DAC until V
BDRIVE
(T1) is equal to
V
BIDEAL
(T1).
4) Name the existing FSO DAC coefficient B.
5) Readjust the offset voltage (by adjusting the Offset
DAC), if required, to 0.5V.
At this point, it is important that no other changes be
made to the Offset or Offset TC DACs until the Offset
TC Compensation step has been completed.
Step 2
To complete linear FSOTC compensation, take data
measurements at a second temperature, T2 (T2 > T1).
Perform the following steps:
1) Measure the full-span output (measuredV
FSO
(T2)).
2) Calculate V
BIDEAL
(T2) using the following equation:
(
3) Set V
BIDEAL
(T2) by adjusting the FSO DAC.
4) Name the current FSO DAC coefficient D.
5) Change FSOTC DAC to 1000.
6) Adjust FSO DAC until V
BDRIVE
is equal to
V
BIDEAL
(T2).
7) Name the FSO DAC coefficient C.
Step 3
Insert the data previously obtained from Steps 1 and 2
into the following equation to calculate FSOTC COEF:
1) Load this FSOTC COEF value into the FSOTC DAC.
2) Adjust the FSO DAC until V
BDRIVE
(T2) is equal to
V
BIDEAL
(T2).
This completes both FSO calibration and FSO TC com-
pensation.
FSOTC COEF
1000 B-D
(
3000 C- A
)
+
B-D
C- A
=
)
+
)
)
V
T2
V
1
desiredV
- measuredV
T2
measuredV
T2
BIDEAL
BDRIVE
FSO
FSO
)
FSO
)
=
+
(
)
(
V
1
V
1
desiredV
- measuredV
T
measuredV
T
BIDEAL
BDRIVE
FSO
FSO
FSO
1
1
+
( )
( )
OFFTC COEF
4096 V
T
V
T 2.3
( )
4096 OTC FSO T
(
TCS V
4096 -1000ppm/ C 4V
(
2.3 T
-2100ppm/ C 2.5V 2.3
1357
OUT
BDRIVE
BDRIVE
=
( )
)
=
)
=
1% Accurate, Digitally Trimmed,
Rail-to-Rail Sensor Signal Conditioner
14
______________________________________________________________________________________
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