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AD7889 Datasheet(PDF) 16 Page - Analog Devices |
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AD7889 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 40 page  AD7879/AD7889 Data Sheet Rev. D | Page 16 of 40 Temperature Calculations If an explicit temperature reading in degrees Celsius is required, calculate for the single measurement method as follows: 1. Calculate the scale factor of the ADC in degrees per LSB. Degrees per LSB = ADC LSB size/−2.1 mV = (VCC/4096)/−2.1 mV 2. Save the ADC output, DCAL, at the calibration temperature, TCAL. 3. Take the ADC reading, DAMB, at the temperature to be measured, TAMB. 4. Calculate the difference in degrees between TCAL and TAMB by ∆T = (DAMB − DCAL) × degrees per LSB 5. Add ∆T to TCAL. Example Using VCC = 2.5 V as reference, Degrees per LSB = (2.5/4096)/−2.1 × 10−3 = −0.291 The ADC output is 983 decimal at 25°C, equivalent to a diode forward voltage of 0.6 V. The ADC output at TAMB is 880. ∆T = (880 − 983) × −0.291 = 30°C TAMB = 25 + 30 = 55°C |
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