MC9S08SH32 Datasheet, PDF (303/328 Pages) Freescale Semiconductor, Inc – Microcontrollers

Appendix A Electrical Characteristics
A.11 ADC Characteristics
Table A-11. ADC Operating Conditions
Num Characteristic
Conditions
Symb
Min
Typ¹
Max Unit
Comment
1 Supply voltage Absolute
2 Input Voltage
3
Input
Capacitance
V_DDAD
2.7
—
5.5
V
V_ADIN
V_REFL
—
V_REFH
V
C_ADIN
—
4.5
5.5
pF
4
Input
Resistance
R_ADIN
—
3
5
kΩ
Analog Source 10 bit mode
5 Resistance
f_ADCK > 4MHz
f_ADCK < 4MHz
R_AS
—
—
kΩ External to MCU
5
—
—
10
6
8 bit mode (all valid f_ADCK)
—
—
10
7 ADC
Conversion
8 _{Clock Freq.}
High Speed (ADLPC=0)
Low Power (ADLPC=1)
f_ADCK
0.4
—
8.0 MHz
0.4
—
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.
R_AS
V_AS
+
–
Z_AS
C_AS
SIMPLIFIED
INPUT PIN EQUIVALENT
CIRCUIT
+
V_ADIN
–
Pad
leakage
due to
input
protection
Z_ADIN
SIMPLIFIED
CHANNEL SELECT
CIRCUIT
R_ADIN
ADC SAR
ENGINE
INPUT PIN
INPUT PIN
INPUT PIN
R_ADIN
R_ADIN
R_ADIN
C_ADIN
Figure A-9. ADC Input Impedance Equivalency Diagram
MC9S08SH32 Series Data Sheet, Rev. 2
Freescale Semiconductor
303
PRELIMINARY