AN2834 datasheet(5/45 Pages) STMICROELECTRONICS

Part #	AN2834

Description	How to get the best ADC accuracy in STM32Fx Series and STM32L1 Series devices

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AN2834

ADC internal principle

44

1

ADC internal principle

1.1

SAR ADC internal structure

The ADC in STM32x microcontrollers uses the SAR (successive approximation register)

principle, by which the conversion is performed in several steps. The number of conversion

steps is equal to the number of bits in the ADC converter. Each step is driven by the ADC

clock. Each ADC clock produces one bit from result to output. ADC internal design is a

switched-capacitor type.

The following figures (Figure 1 to Figure 6) explain the principle of ADC operation. The

example given below shows only the first steps of approximation but the process continues

till the LSB is reached.

Figure 1. Basic schematic of SAR switched-capacitor ADC (example for 10-bit ADC)

1. Basic ADC schematic with digital output.

S1

Sb

CLK

D

Q

CLR

PR

A

S2

Sa

VIN

ADC Data

ADC Clk

S3

S4

S5

S6

S7

S8

S9

C

C/2

C/4

C/8

C/16

C/32

C/64

C/128

C/256

ai17097

VREF

S10

S11

C/512

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