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AN2719 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN2719
Description  Precision improvement techniques
PDF  22 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2719 Datasheet(HTML) 6 Page - STMicroelectronics

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STM8 ADC internal hardware
AN2719
6/22
Figure 5.
Step 2, if MSB = 1 then compare with 3/4 VREF
Figure 6.
Step 2 if MSB = 0 then compare with 1/4 VREF
S1
A
S2
Sa
Vref
Vin
Sb
A
3C/2
C/2
Vref
Vcomp = - Vin + 3/4 Vref
Equivalent circuit:
S3
S4
S5
S6
S7
S8
S9
C
C/2
C/4
C/8
C/16
C/32
C/64
C/128
C/128
S1
A
S2
S3
Sa
Vref
Vin
Sb
A
C/2
3C/2
Vref
Vcomp = - Vin + 1/4 Vref
Equivalent circuit:
C
C/2
C/4
C/8
C/16
C/32
C/64
C/128
C/128
S4
S5
S6
S7
S8
S9



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