AN2834 datasheet(5/45 Pages) STMICROELECTRONICS

部件名	AN2834

功能描述	How to get the best ADC accuracy in STM32Fx Series and STM32L1 Series devices

PDF	45 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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5 / 45 page

DocID15067 Rev 2

5/45

AN2834

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.

CLK

CLR

VIN

ADC Data

ADC Clk

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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