AN2834 datasheet(8/45 Pages) STMICROELECTRONICS

Part #	AN2834

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

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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8 / 45 page

ADC internal principle

AN2834

8/45

DocID15067 Rev 2

Figure 6. Step 2: If MSB = 0, then compare with ¼ VREF

1. Compare with ¼ VREF; if MSB =0. S1 remained switched to ground. S2 switched to VREF.

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

ai17802

VREF

S10

S11

C/512

Equivalent circuit:

A

C/2

3C/2

VREF

VCOMP= –V IN+ ¼ V REF

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