- 您現(xiàn)在的位置：買賣IC網 > PDF目錄383320 > MAX1450CAP (MAXIM INTEGRATED PRODUCTS INC) Low-Cost, 1%-Accurate Signal Conditioner for Piezoresistive Sensors PDF資料下載
參數(shù)資料
| 型號： | MAX1450CAP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調理 |
| 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)： | 7/12頁 |
| 文件大?。?/td> | 98K |
| 代理商： | MAX1450CAP |
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PDF資料 |
PDF描述 |
|---|---|
| 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 |
| MAX1452EAE | Low-Cost Precision Sensor Signal Conditioner |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1450EAP | 制造商:Maxim Integrated Products 功能描述:#EMPTY - Rail/Tube |
| MAX1450EAP-T | 制造商:Maxim Integrated Products 功能描述:#EMPTY - Tape and Reel |
| MAX1450EVKIT-US | 制造商:Maxim Integrated Products 功能描述:KIT PKG - Bulk |
| MAX14510EEVB+ | 功能描述:模擬開關 IC USB 2.0 Hi-Speed Audio Switches RoHS:否 制造商:Texas Instruments 開關數(shù)量:2 開關配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| MAX14510EEVB+T | 功能描述:交換機 IC 開發(fā)工具 USB 2.0 Hi-Speed Audio Switches RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:USB Power Switches 工具用于評估:MAX4984E 工作電源電壓:2.8 V to 5.5 V |
發(fā)布緊急采購，3分鐘左右您將得到回復。