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CD00001237 Datasheet(PDF) 89 Page - STMicroelectronics

Part # CD00001237
Description  8-bit MCUs with A/D converter
PDF  105 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

CD00001237 Datasheet(HTML) 89 Page - STMicroelectronics

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ST6215C ST6225C
89/105
11.11 8-BIT ADC CHARACTERISTICS
Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified.
Notes:
1. Unless otherwise specified, typical data are based on TA=25°C and VDD=5V.
2. The ADC refers to VDD and VSS.
3. Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than 10k
Ω). Data
based on characterization results, not tested in production.
4. As a stabilization time for the AD converter is required, the first conversion after the enable can be wrong.
Figure 72. Typical Application with ADC
Note: ADC not present on some devices. See device summary on page 1.
Symbol
Parameter
Conditions
Min
Typ 1)
Max
Unit
fOSC
Clock frequency
1.2
fOSC
MHz
VAIN
Conversion range voltage 2)
VSS
VDD
V
RAIN
External input resistor
10 3)
k
Ω
tADC
Total convertion time
fOSC=8MHz
fOSC=4MHz
70
140
μs
tSTAB
Stabilization time 4)
24
tCPU
fOSC=8MHz
3.25
6.5
µs
ADI
Analog input current during conver-
sion
1.0
µA
ACIN
Analog input capacitance
2
5
pF
AINx
ST62XX
VAIN
RAIN
10pF
ADC
10M
Ω
r
≈150Ω
1



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