MAX1458

1%精确度、数字调节传感器信号调理器

业内尺寸最小的压力传感器信号调理器


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说明

The MAX1458 highly integrated analog-sensor signal processor is optimized for piezoresistive sensor calibration and compensation without any 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 MAX1458 compensates offset, offset temperature coefficient, full-span output (FSO), FSO temperature coefficient (FSOTC), and FSO nonlinearity of silicon piezoresistive sensors.

The MAX1458 calibrates and compensates first-order temperature errors by adjusting the offset and span of the input signal via digital-to-analog converters (DACs), thereby eliminating quantization noise. Built-in testability features on the MAX1458 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 MAX1458.

  • Final test operation:Verification of transducer calibration and compensation without removal from the pretest socket.

    Although optimized for use with piezoresistive sensors, the MAX1458 may also be used with other resistive sensors (i.e., accelerometers and strain gauges) with some additional external components.
  • MAX1458:功能框图 MAX1458:功能框图 放大+

    关键特性

    • Medium Accuracy (±1%), Single-Chip Sensor Signal Conditioning
    • 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 (< 1ms)
    • Accepts Sensor Outputs from 10mV/V to 40mV/V
    • Fully Analog Signal Path

    应用

    • 水压系统
    • 歧管绝对压力(MAP)传感器
    • 压阻式压力及加速度传感器
    • 变送器与发送器
    申请可靠性报告: MAX1458 
    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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