The MAX1457 is a highly integrated analog-sensor signal processor optimized for piezoresistive sensor calibration and compensation. It includes a programmable current source for sensor excitation, a 3-bit programmable-gain amplifier (PGA), a 12-bit ADC, five 16-bit DACs, and an uncommitted op amp. Achieving a total error factor within 0.1% of the sensor's repeatability errors, the MAX1457 compensates offset, full-span output (FSO), offset TC, FSO TC, and full-span output nonlinearity of silicon piezoresistive sensors.
The MAX1457 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. If needed, residual higher-order errors are then compensated using linear interpolation of the first-order coefficients stored in a look-up table (in external EEPROM).
The MAX1457 integrates 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 external EEPROM) of calibration and compensation coefficients determined from transducer pretest data.
Final Test: Verification of transducer calibration and compensation, without removal from a pretest socket.
Analog outputs are provided for both pressure and temperature. A general-purpose, uncommitted op amp is also included on-chip to increase the overall circuit gain, or to facilitate the implementation of a 2-wire, 4-20mA transmitter. The serial interface is compatible with MICROWIRE™ and SPI™, and directly connects to an external EEPROM. Additionally, built-in testability features of the MAX1457 facilitate manufacturing and calibration of multiple sensor modules, thus lowering manufacturing cost.
Although optimized for use with piezoresistive sensors, the MAX1457 may also be used with other resistive sensor types (i.e., accelerometers and strain gauges) with the addition of a few external components.
주요기능
애플리케이션/용도
High Accuracy (within ±0.1% of sensor's repeatable errors)
필요한 것을 찾지 못하셨나요?
Maxim 애플리케이션 엔지니어에게 문의하십시오. 부품을 찾는데 필요한 전문가의 도움이 보통 업무일 1일 이내에 제공됩니다.
부품번호 suffix: T 또는 T&R = 테잎 앤 릴,
+ = RoHS/lead-free,
# = RoHS/lead 예외.추가 정보: 전체 데이터 시트 또는 부품번호 규칙
*일부 패키지는 크기 편차(variation)를 가지며 이 값은 도면 상에 제시되어 있습니다. “패키지 코드/편차”는 해당 제품이 사용하고 있는 편차를 보여줍니다. 부품번호 suffix에 "+", "#", "-"는 RoHS 준수 상태를 나타냅니다. 패키지 도면에 suffix 문자는 다를 수 있습니다.
이 제품은 웹사이트에서 구매가 불가능합니다. 구매를 원하시면 당사로 문의해주십시오.
참고 사항
Contains PGA, current source, five 16-bit correction DACs, 12-bit ADC, oscillator
관련된 제품군
MAX1450 압전 센서용 저가, 1% 정확도의 신호 컨디셔너 MAX1455 저비용 자동차 센서 신호 컨디셔너
다운로드
