Analog-to-digital converters sample and quantise a signal; resolution is bits.
ADCs convert voltage to digital codes: resolution (bits), sampling rate, accuracy. LSB=V_ref/2ⁿ. Architectures: flash (fast), SAR (general), sigma-delta (high resolution, slower), pipeline. Quantisation noise limits SNR≈6.02N+1.76 dB.
A 12-bit ADC with 3.3 V reference has 0.8 mV steps.
ADCs turn real-world signals into numbers for processing, so resolution and speed limit what an embedded system can measure.
Analog-to-digital converters sample and quantise a signal; resolution is bits.
ADCs turn real-world signals into numbers for processing, so resolution and speed limit what an embedded system can measure.
The number of bits, which sets the number of output levels and the smallest voltage step the converter can detect.
The difference between the true input and the nearest code, which is up to half a least significant bit and cannot be removed by the converter itself.
Typical applications include reading a potentiometer position with a 10-bit ADC, digitising the output of a strain gauge amplifier and sampling a battery voltage to estimate remaining charge.
Study "Logic families" first (topic 48 of 104 in Electronics & Embedded). It covers the groundwork this topic builds on.
Aliasing needs anti-alias filter. INL and DNL errors. ENOB.
A 12-bit ADC with 3.3 V reference has 0.8 mV steps.
The next topic is "DAC", which builds directly on this one.
It is classed as Intermediate in Electronics & Embedded (topic 49 of 104). It is an intermediate topic. Work through the beginner topics in Electronics & Embedded first.
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