MAX1460

Low-Power, 16-Bit Smart ADC


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Description

The MAX1460 implements a revolutionary concept in signal conditioning, where the output of its 16-bit analog-to-digital converter (ADC) is digitally corrected over the specified temperature range. This feature can be readily exploited by industrial and medical market segments, in applications such as sensors and smart batteries. Digital correction is provided by an internal digital signal processor (DSP) and on-chip 128-bit EEPROM containing user-programmed calibration coefficients. The conditioned output is available as a 12-bit digital word and as a ratiometric (proportional to the supply voltage) analog voltage using an on-board 12-bit digital-to-analog converter (DAC). The uncommitted op amp can be used to filter the analog output, or implement a 2-wire, 4-20mA transmitter.

The analog front end includes a 2-bit programmable-gain amplifier (PGA) and a 3-bit coarse-offset (CO) DAC, which condition the sensor's output. This coarsely corrected signal is digitized by a 16-bit ADC. The DSP uses the digitized sensor signal, the temperature sensor, and correction coefficients stored in the internal EEPROM to produce the conditioned output.

Multiple or batch manufacturing of sensors is supported with a completely digital test interface. Built-in testability features on the MAX1460 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 of calibration and compensation coefficients determined from transducer pretest data.
  • Final Test Operation: Verification of transducer calibration and compensation, without removal from the pretest socket.


  • The MAX1460 evaluation kit (EV kit) allows fast evaluation and prototyping, using a piezoresistive transducer (PRT) and a Windows®-based PC. The user-friendly EV kit simplifies small-volume prototyping; it is not necessary to fully understand the test-system interface, the calibration algorithm, or many other details to evaluate the MAX1460 with a particular sensor. Simply plug the PRT into the EV kit, plug the EV kit into a PC parallel port, connect the sensor to an excitation source (such as a pressure controller), and run the MAX1460 EV kit software. An oven is required for thermal compensation.
    MAX1460: Functional Diagram MAX1460: Functional Diagram Enlarge+

    Key Features

    • Low-Noise, 400µA Single-Chip Sensor Signal Conditioning
    • High-Precision Front End Resolves Less than 1µV of Differential Input Signal
    • On-Chip DSP and EEPROM Provide Digital Correction of Sensor Errors
    • 16-Bit Signal Path Compensates Sensor Offset and Sensitivity and Associated Temperature Coefficients
    • 12-Bit Parallel Digital Output
    • Analog Output
    • Compensates a Wide Range of Sensor Sensitivity and Offset
    • Single-Shot Automated Compensation Algorithm-No Iteration Required
    • Built-In Temperature Sensor
    • Three-State, 5-Wire Serial Interface Supports High-Volume Manufacturing

    Applications/Uses

    • Dive Computers and Liquid-Level Sensing
    • Flow Meters
    • Handheld Instruments (PDAs, Palmtops)
    • Hydraulic Systems
    • Industrial Pressure Sensors and 4mA to 20mA Transmitters
    • Piezoresistive Pressure and Acceleration Transducers and Transmitters
    • Smart Battery Packs/Chargers
    • Weigh Scales and Strain-Gauge Measurement
    Request Reliability Report for: MAX1460 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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