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参数资料
| 型号： | MAX1459CAP+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | 2-Wire, 4-20mA Smart Signal Conditioner |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封装： | SSOP-20 |
| 文件页数： | 7/24页 |
| 文件大小： | 243K |
| 代理商： | MAX1459CAP+T |
test pressures (e.g., zero and full scale) at two arbitrary
test temperatures, T1 and T2. Ideally, T1 and T2 are the
two points where we wish to perform best linear fit com-
pensation. The following outlines a typical compensa-
tion procedure:
1) Perform coefficient initialization.
2) Perform FSO calibration.
3) Perform FSOTC compensation.
4) Perform offset TC compensation.
5) Perform offset calibration.
Coefficient Initialization
Select the resistor values and the PGA gain to prevent
overload of the PGA and bridge current source.
Determine whether the MAX1459’s internal resistors are
suitable or external resistors are necessary. These val-
ues depend on sensor behavior and require some sen-
sor characterization data, which may be available from
the sensor manufacturer. If not, the data can be gener-
ated by performing a two-temperature, two-pressure
sensor evaluation. The required sensor information is
shown in Table 8 and can be used to obtain the values
for the parameters listed in Table 9.
Selecting RISRC
When using an external resistor, use the equation below
to determine the value of RISRC, and place the resistor
between ISRC and VSS. Since the 12-bit FSO DAC pro-
vides considerable dynamic range, the RISRC value
need not be exact. Generally, any resistor value within
±50% of the calculated value is acceptable. If both the
internal resistors RISRC and RFTC are used, set the IRS
bit at EEPROM address bit 07 hex low.
MAX1459
2-Wire, 4–20mA
Smart Signal Conditioner
______________________________________________________________________________________
15
-20
-10
10
0
20
30
-50
0
50
100
150
UNCOMPENSATED SENSOR ERROR
TEMPERATURE (°C)
ERROR
(%
FSO)
OFFSET
FSO
-0.8
-0.6
0.4
-0.2
-0.4
0
0.2
0.6
0.8
-50
0
50
100
150
COMPENSATION TRANSDUCER ERROR
TEMPERATURE °(C)
ERROR
(%
SPAN)
OFFSET
FSO
Figure 12. Comparison of an Uncalibrated Sensor and a Temperature-Compensated Transducer
Table 7. MAX1459 Calibration and Compensation
0.7% FSO
-40°C to +125°C
Temperature Range
0.5% FSO
FSO TC Nonlinearity
-35% FSO
FSO TC
Offset TC Nonlinearity
-17% FSO
Offset TC
+15mV/V
FSO
±80% FSO
Offset
DESCRIPTION
NAME
TYPICAL UNCOMPENSATED INPUT (SENSOR)
±20mV (±0.5% FSO)
FSO Accuracy Over Temp
Range
±28mV (±0.7% FSO)
Offset Accuracy Over Temp
Range
4.000V ±5mV
FSO at +25°C
0.500V ±5mV
Offset at +25°C
Ratiometric to VDD at 5.0V
DESCRIPTION
NAME
VOUT
TYPICAL COMPENSATED TRANSDUCER OUTPUT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX145ACPA | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX145ACPA+ | 功能描述:模数转换器 - ADC 12-Bit 108ksps 5.25V High Speed ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX145ACUA | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX145ACUA+ | 功能描述:模数转换器 - ADC 12-Bit 108ksps 5.25V High Speed ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX145ACUA+T | 功能描述:模数转换器 - ADC 12-Bit 108ksps 5.25V High Speed ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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