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參數(shù)資料
| 型號： | MAX1450CAP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Low-Cost, 1%-Accurate Signal Conditioner for Piezoresistive Sensors |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封裝： | 5.30 X 0.65 MM, SSOP-20 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 98K |
| 代理商： | MAX1450CAP |
M
5) Set V
FSOTRIM
= V
BIDEAL(25°C)
. Adjust R
ISRC
until
V
BBUF
= V
BIDEAL(25°C)
.
6) Readjust V
OFFSET
until the offset voltage is 0.5V (see
OFFSET Calibrationsection).
FS O T C Compensation
Correct linear span TC by connecting BBUF to ISRC
through a resistor (R
STC
). The value of R
STC
depends
on the required correction coefficient, which is sensor
dependent, but typically around 100k
for most silicon
PRTs. The following procedure results in FSO TC cali-
bration:
1) Measure the full-span output at T2.
2) Use the equation from Step 4 of the FSO Calibration
section to determine V
BIDEAL(T2)
. While at T2, adjust
R
STC
until V
BBUF
= V
BIDEAL(T2)
.
3) Do not adjust V
OFFSET
or V
OFFTC
.
OFFS ET T C Compensation
Connect OFFTC to a resistor divider between BBUF
and V
SS
. The divided-down V
BBUF
is then fed into
OFFTC and the appropriate polarity (designating
whether V
OFFTC
should be added or subtracted from
the PGA output) is selected with SOTC.
1) At T2, remeasure the offset at V
OUT
.
2) Use the following equation to determine the magni-
tude of V
OFFTC(T2)
, and adjust R
OTCA
accordingly. If
V
OFFTC
is negative, connect SOTC to V
SS
. If V
OFFTC
is positive, connect SOTC to V
DD
. After OTC calibra-
tion, the output may be saturated; correct this condi-
tion during OFFSET calibration. In most cases
Current OFFTC will be 0. However, if a coarse
OFFTC adjustment was performed, the coefficient
must be inserted in the equation below.
where Current OFFTC is the voltage at pin OFFTC.
Note that the magnitude of V
OFFTC
is directly propor-
tional to the gain of the PGA. Therefore, if the PGA gain
changes after performing the offset TC calibration, the
offset TC must be recalibrated.
V
V
V
V
V
x 1.15
Current OFFTC
OFFTC
OFFSET(T1)
OFFSET(T2)
BDRIVE(T1)
BDRIVE(T2)
=
(
)
+
Low-Cost, 1%-Ac c urate S ignal Conditioner
for Piezoresistive S ensors
8
_______________________________________________________________________________________
R
STC
R
FSOB
R
FSOA
V
DD
V
DD
R
ISRC
0.1
μ
F
R
LIN
(OPTIONAL)
PGA
A = 1
CURRENT
SOURCE
V
DD
OUT
OUT
ISRC
BDRIVE
INP
INM
SOTC
SOFF
OFFSET
OFFTC
BBUF
A2
A1
A0
V
DD
V
DD
FSOTRIM
V
SS
MAX1450
R
OTCA
R
OTCB
R
OFFA
R
OFFB
V
DD
V
DD
0.1
μ
F
0.1
μ
F
SENSOR
Figure 4. Basic Ratiometric Output Configuration
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