MAX1459

2线、4-20mA智能信号调理器


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说明

The MAX1459 highly integrated analog-sensor signal conditioner is optimized for piezoresistive sensor calibration and compensation with minimal external components. It includes a programmable current source for sensor excitation, a 3-bit programmable-gain amplifier (PGA), a 128-bit internal EEPROM, and four 12-bit DACs. Achieving a total error factor within 1% of the sensor's repeatability errors, the MAX1459 compensates offset, offset temperature coefficient (offset TC), full-span output (FSO), FSO temperature coefficient (FSOTC), and FSO nonlinearity of silicon piezoresistive sensors.

The MAX1459 calibrates and compensates first-order temperature errors by adjusting the offset and span of the input signal through digital-to-analog converters (DACs), thereby eliminating quantization noise.

The MAX1459 allows temperature compensation via the external sensor, an internal temperature-dependent resistor, or a dedicated external temperature transducer. Accuracies better than 0.5% can be achieved with low-cost external temperature sensors (i.e., silicon transistor), depending on sensor choice.

Built-in testability features on the MAX1459 result in the integration of three traditional sensor-manufacturing operations into one automated process:

  • Pretest: Data acquisition of sensor performance under the control of a host test computer.
  • Calibration and compensation: Computation and storage (in an internal EEPROM) of calibration and compensation coefficients computed by the test computer and downloaded to the MAX1459.
  • Final test operation: Verification of transducer calibration and compensation without removal from the pretest socket.


Although optimized for use with piezoresistive sensors, the MAX1459 may also be used with other resistive sensors (i.e., accelerometers and strain gauges) with some additional external components.
MAX1459:功能框图 MAX1459:功能框图 放大+

关键特性

  • Highly Integrated Sensor Signal Conditioner for 2-Wire, 4-20mA Transmitters
  • Sensor Errors Trimmed Using Correction Coefficients Stored in Internal EEPROM-Eliminates the Need for Laser Trimming and Potentiometers
  • Compensates Offset, Offset TC, FSO, FSOTC, FSO Linearity
  • Programmable Current Source (0.1mA to 2.0mA) for Sensor Excitation
  • Fast Signal-Path Settling Time (approximately 1ms)
  • Accepts Sensor Outputs from +1mV/V to +40mV/V
  • Fully Analog Signal Path
  • Internal or External Temperature Reference Compensation
  • Automated Pilot Production (Calibration/Compensation) System Available
  • Write Protection for EEPROM Data Security

应用

  • 4mA至20mA变送器
  • 工业压力传感器
  • 负荷单元/惠斯通桥
  • 压阻式压力及加速度传感器
  • 应变仪
  • 温度检测与监视
申请可靠性报告: MAX1459 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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