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AN2834 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN2834
Description  How to get the best ADC accuracy in STM32Fx Series and STM32L1 Series devices
PDF  45 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2834 Datasheet(HTML) 6 Page - STMicroelectronics

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ADC internal principle
AN2834
6/45
DocID15067 Rev 2
Figure 2. Sample state
1. Sample state - capacitors are charging to VIN voltage. Sa switch to VIN, Sb switch closed during sampling
time.
Figure 3. Hold state
1. Hold state - input is disconnected - capacitors hold input voltage. Sb switch is open, then S1-S11 switched
to ground and Sa 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
ai17098
VREF
S10
S11
C/512
C/512
A
2C
VCOMP= 0
Equivalent circuit:
VIN
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
ai17099
VREF
S10
S11
C/512
C/512
Equivalent circuit:
A
2C
VCOMP= –V IN



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