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MAX1457CCJ Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX1457CCJ Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 12 page 0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compensation _______________________________________________________________________________________ 5 _______________Detailed Description The MAX1457 provides an analog amplification path for the sensor signal and a digital path for calibration and temperature correction. Calibration and correction are achieved by varying the offset and gain of a program- mable-gain amplifier (PGA) and by varying the sensor bridge current. The PGA utilizes a switched-capacitor CMOS technology, with an input-referred offset trim- ming range of ±100mV (20mV/V) and an approximate 3µV (input referred, at minimum gain of 54V/V) resolu- tion (16 bits). The PGA provides eight gain values from 54V/V to 306V/V. The bridge current source is program- mable from 0.1mA to 2mA, with a 15nA step size. The MAX1457 uses five 16-bit DACs with calibration coefficients stored in a low-cost external EEPROM. This memory (an external 4096-bit EEPROM) contains the following calibration coefficients as 16-bit words: • FSO (full-span output) • FSO TC (including nonlinearities) • Offset • Offset TC (including nonlinearities) • Pressure nonlinearity Figure 1 shows a typical pressure-sensor output and defines the offset, full-scale, and full-span output values as a function of voltage. Offset Correction Initial offset calibration is accomplished by reading a 16-bit word (coefficient) from the EEPROM and writing it to the OFFSET DAC. The resulting voltage (OFSTDAC) is fed into a summing junction at the PGA output for compensating the sensor offset with a resolution of ±0.2mV (±0.005% FSO). PRESSURE FULL-SCALE (FS) FULL-SPAN OUTPUT (FSO) OFFSET Figure 1. Typical Pressure-Sensor Output VBR T VBR IBR RSTC VDD EDI ECS ECLK TO/FROM EXTERNAL EEPROM EDO EEPROM INTERFACE ADC BDRIVE 12 16 OUTPUT PGA TEMPERATURE- DEPENDENT VOLTAGE OFFSET TC DAC REFERENCE VOLTAGE FSO TC DAC Σ 16 A = 1 Figure 2. Simplified Diagram of Temperature Error Correction |
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