參數(shù)資料
型號(hào): MAX1450
廠商: Maxim Integrated Products, Inc.
英文描述: Low-Cost, 1%-Accurate Signal Conditioner for Piezoresistive Sensors
中文描述: 低成本、1%精確度信號(hào)調(diào)理器,用于壓阻式傳感器
文件頁(yè)數(shù): 7/12頁(yè)
文件大小: 98K
代理商: MAX1450
where OUTFSO is the desired calibrated transducer
full-span output voltage, and SensorFSO is the sensor
full-span output voltage at T1.
Determining OFFTC Initial Value
Generally, the OFFTC coefficient can be set to 0V,
since the offset TC errors will be compensated in a later
step. However, sensors with large offset TC errors may
require an initial coarse offset TC adjustment to prevent
the PGA from saturating as the temperature increases
during the compensation procedure. An initial coarse
offset TC adjustment would be required if the magni-
tude of the sensor offset TC error is more than about
10% of the FSO. If a coarse offset TC adjustment is
required, use the following equation:
which can be approximated by:
where OTC is the sensor offset TC error in ppm of FSO,
T is the operating temperature range in °C, and OTC
Correction is the offset TC resistor-divider ratio. For
positive values of OTC correction, connect SOTC to
V
DD
; for negative values, connect SOTC to V
SS
.
Select the Offset TC resistor divider (R
OTCA
and
R
OTCB
, Figure 4) using the following equation:
where 500k
(R
OTCA
+ R
OTCB
)
100k
. Choose
R
OTCB
= 100k
and R
OTCA
= 20k
.
T ransfer Func tion
The following transfer function (linearity correction not
included) is useful for data modeling or for developing
compensative algorithms:
(AA = current source gain)
FS O Calibration
Perform FSO calibration at room temperature with a full-
scale sensor excitation.
1) At +25°C (or T1), set V
FSOTRIM
to 2.5V. Adjust
R
ISRC
until V
BBUF
= 2.5V.
2) Adjust V
OFFSET
until the room temperature offset
voltage is 0.5V (see OFFSET Calibrationsection).
3) Measure the full-span output (measuredV
FSO
).
4) Calculate V
BIDEAL(25°C)
using the following equation:
Note: If V
BIDEAL(25°C)
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(25°C)
is too low,
decrease the PGA gain setting by one step and return
to Step 1. If V
BIDEAL(25°C)
is too high, increase the PGA
gain setting by one step and return to Step 1.
V
V
1
desiredV
measuredV
]
[
measuredV
[
BIDEAL(25 C)
FSOTRIM
FSO
FSO
FSO
=
+
[
]
]
V
V
x
V x PGA + 1.15 x V
V
V
1.15 x V
where V
=
R
V
R
1
AA x Rb(T)
1
R
OUT
BDRIVE
OFFTC
DD
OFFSET
BDRIVE
DD
ISRC
DD
STC
STC
=
+
+
+
OTC Correction
R
R
R
R
R
R
OTCA
+
OTCA
OTCB
OTCA
+
OTCA
OTCB
0 17
=
=
OTC Correction
OTC x FSO x ( T)
TCS x V
1
2100 x .5V x 1.15
x 1.15 x ( T)
4
V
0.68
BDRIVE
ppm C x
/
=
030
OTC Correction
V
V
x 1.15
OUT(T)
BDRIVE(T)
=
A
OUTFSO
SensorFSO
4V
0.0375V
106V/V
PGA
=
M
Low-Cost, 1%-Ac c urate S ignal Conditioner
for Piezoresistive S ensors
_______________________________________________________________________________________
7
Table 3. PGA Gain Settings
PGA GAIN (V/V)
PGA VALUE
A2
A1
A0
39
0
0
0
0
65
1
0
0
1
91
2
0
1
0
117
3
0
1
1
143
4
1
0
0
169
5
1
0
1
195
6
1
1
0
221
7
1
1
1
相關(guān)PDF資料
PDF描述
MAX1450CAP Low-Cost, 1%-Accurate Signal Conditioner for Piezoresistive Sensors
MAX1450EAP Low-Cost, 1%-Accurate Signal Conditioner for Piezoresistive Sensors
MAX1452 Low-Cost Precision Sensor Signal Conditioner
MAX1452AAE Low-Cost Precision Sensor Signal Conditioner
MAX1452CAE Low-Cost Precision Sensor Signal Conditioner
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX14502AETL+ 功能描述:接口 - 專(zhuān)用 High speed USB to FS-USB RoHS:否 制造商:Texas Instruments 產(chǎn)品類(lèi)型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59
MAX14502AETL+T 功能描述:接口 - 專(zhuān)用 High speed USB to FS-USB RoHS:否 制造商:Texas Instruments 產(chǎn)品類(lèi)型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59
MAX14502EVKIT+ 功能描述:界面開(kāi)發(fā)工具 MAX14502 Eval Kit RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V
MAX14503AEWN+ 制造商:Maxim Integrated Products 功能描述:
MAX14503ETL+ 制造商:Maxim Integrated Products 功能描述: