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In page 64 of the DS, the section named "DRIVING ANALOG SIGNAL INPUT WITHOUT AN OPERATIONAL AMPLIFIER" describes the use of a bypass capacitor and the sampling rate for determining the output impedance of the circuit. Can you explain how we can use this configuration to read a thermistor and whether a 10kΩ @ 25°C thermistor is within the range for measurement? The idea is to expand dynamic range by not using a traditional voltage divider (resistor + thermistor). Any details you can offer are highly appreciated.
Thank you!
Hi Lenio,
The details are described in page 65, the theory behind that is the larger source resistance including R1 leads to a longer time to settle the input signal on the sampling capacitor inside ADC. The section of Driving SAR ADC without amplifiers in TI Precision Labs ADC videos can help you understand.
Thanks®ards,
Dale