5 v to 3.3 v Voltage Divider (With Calculator) - OneSDR - 🛜 Technology
Fleeting- External reference: https://www.onesdr.com/5-v-to-3-3-v-voltage-divider-calculator/
if you’re trying to interface to an Analog-to-Digital Converter (ADC) like the ATmega328P for instance, there is a requirement that the input impedance be lower than 10 kΩ. Higher values of input impedance will increase the sampling time and result in errors as the input signal won’t settle to a stable value fast enough.
On account of this requirement, the better set of values for this application is R1 = 1 kΩ and R2 = 1.94 kΩ. The effective impedance is 660 Ω (using this calculator)
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