Simplified Block Diagram
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- 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
- 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
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:
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.