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MC9S08SH8_08 Datasheet, PDF (306/338 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Appendix A Electrical Characteristics
A.11 ADC Characteristics
Table A-11. ADC Operating Conditions
Characteristic
Conditions
Symb
Min
Typ1
Max Unit
Comment
Supply voltage
Input Voltage
Input
Capacitance
Absolute
VDDAD
2.7
â
5.5
V
VADIN
VREFL
â
VREFH
V
CADIN
â
4.5
5.5
pF
Input
Resistance
RADIN
â
3
5
kΩ
Analog Source
Resistance
10 bit mode
fADCK > 4MHz
fADCK < 4MHz
RAS
â
â
5
â
â
10
kΩ
External to MCU
8 bit mode (all valid fADCK)
â
â
10
ADC
Conversion
Clock Freq.
High Speed (ADLPC=0)
Low Power (ADLPC=1)
fADCK
0.4
â
8.0
MHz
0.4
â
4.0
1 Typical values assume VDDAD = VDD = 5.0V, Temp = 25°C, fADCK=1.0MHz unless otherwise stated. Typical values are for
reference only and are not tested in production.
RAS
VAS
+
â
ZAS
CAS
SIMPLIFIED
INPUT PIN EQUIVALENT
CIRCUIT
+
VADIN
â
Pad
leakage
due to
input
protection
ZADIN
SIMPLIFIED
CHANNEL SELECT
CIRCUIT
RADIN
ADC SAR
ENGINE
INPUT PIN
INPUT PIN
INPUT PIN
RADIN
RADIN
RADIN
CADIN
Figure A-9. ADC Input Impedance Equivalency Diagram
MC9S08SH8 MCU Series Data Sheet, Rev. 3
306
Freescale Semiconductor
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