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參數(shù)資料
| 型號： | MAX1452EVKIT-CS |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 24/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL KIT FOR MAX1452 |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 主要目的： | 接口，傳感器信號調(diào)節(jié)器 |
| 已用 IC / 零件： | MAX1452 |
| 已供物品： | 板 |
MAX1452
Low-Cost Precision Sensor
Signal Conditioner
8
Maxim Integrated
Linear and Nonlinear
Temperature Compensation
Writing 16-bit calibration coefficients into the offset TC
and FSOTC registers compensates first-order tempera-
ture errors. The piezoresistive sensor is powered by a
current source resulting in a temperature-dependent
bridge voltage due to the sensor's temperature resis-
tance coefficient (TCR). The reference inputs of the off-
set TC DAC and FSOTC DAC are connected to the
bridge voltage. The DAC output voltages track the
bridge voltage as it varies with temperature, and by
varying the offset TC and FSOTC digital code a portion
of the bridge voltage, which is temperature dependent,
is used to compensate the first order temperature
errors.
The internal feedback resistors (RISRC and RSTC) for
FSO temperature compensation are optimized to 75k
Ω
for silicon piezoresistive sensors. However, since the
required feedback resistor values are sensor dependent,
external resistors may also be used. The internal resis-
tors selection bit in the configuration register selects
between internal and external feedback resistors.
To calculate the required offset TC and FSOTC com-
pensation coefficients, two test-temperatures are need-
ed. After taking at least two measurements at each
temperature, calibration software (in a host computer)
calculates the correction coefficients and writes them to
the internal EEPROM.
With coefficients ranging from 0000hex to FFFFhex and
a +5V reference, each DAC has a resolution of 76V.
Two of the DACs (offset TC and FSOTC) utilize the sen-
sor bridge voltage as a reference. Since the sensor
bridge voltage is approximately set to +2.5V the FSOTC
and offset TC exhibit a step size of less than 38V.
For high accuracy applications (errors less than
0.25%), the first-order offset and FSO TC error should
be compensated with the offset TC and FSOTC DACs,
and the residual higher order terms with the lookup
table. The offset and FSO compensation DACs provide
unique compensation values for approximately 1.5°C of
temperature change as the temperature indexes the
address pointer through the coefficient lookup table.
Changing the offset does not effect the FSO, however
changing the FSO affects the offset due to nature of the
bridge. The temperature is measured on both the
MAX1452 die and at the bridge sensor. It is recom-
mended to compensate the first-order temperature
errors using the bridge sensor temperature.
Typical Ratiometric
Operating Circuit
Ratiometric output configuration provides an output that
is proportional to the power supply voltage. This output
can then be applied to a ratiometric ADC to produce a
digital value independent of supply voltage.
Ratiometricity is an important consideration for battery-
operated instruments, automotive, and some industrial
applications.
The MAX1452 provides a high-performance ratiometric
output with a minimum number of external components
(Figure 2). These external components include the fol-
lowing:
One supply bypass capacitor.
One optional output EMI suppression capacitor.
Two optional resistors, RISRC and RSTC, for special
sensor bridge types.
Figure 2. Basic Ratiometric Output Configuration
MAX1452
+5V VDD
OUT
GND
RSTC
RISRC
0.1
μF 0.1μF
INM
TEST VSS
INP
7
9
2
16
1
8
3
BDR
VDDF
OUT
5
6
4
FSOTC
ISRC
SENSOR
VDD
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參數(shù)描述 |
|---|---|
| MAX1452EVKIT-NS | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 Low-Cost Precision Sensor Signal Conditioner RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| MAX1452EVKIT-NS+ | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 Programmers, Development Systems Eval and Demo Boards and Kits - KIT EVAL MAX1452-NS RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| MAX1452KEY | 功能描述:溫度傳感器開發(fā)工具 MAX1455 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:Temperature Sensors and Control ICs 工具用于評估:MSP430G2553 接口類型:USB 工作電源電壓: 工作電源電流: |
| MAX14530EEVKIT+ | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION WITH USB CHARGER DETECTION LDO AND ES - Boxed Product (Development Kits) |
| MAX14530EEWC+T | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION WITH CHARGER DETECTION - Tape and Reel |
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