Datasheet

MC9S08SE8 Series MCU Data Sheet, Rev. 3
Electrical Characteristics
Freescale Semiconductor22
3.9 ADC Characteristics
Figure 18. ADC Input Impedance Equivalency Diagram
Table 11. 10-Bit ADC Operating Conditions
Characteristic Conditions Symb Min Typ
1
1
Typical values assume V
DDA
= 5.0 V, Temp = 25 °C, f
ADCK
= 1.0 MHz unless otherwise stated. Typical values are for
reference only and are not tested in production.
Max Unit Comment
Supply voltage
Absolute V
DDA
2.7 — 5.5 V
Delta to V
DD
(V
DD
– V
DDA
)
2
2
DC potential difference.
ΔV
DDA
–100 0 100 mV
Ground voltage Delta to V
SS
(V
SS
– V
SSA
)
2
ΔV
SSA
–100 0 100 mV
Input voltage V
ADIN
V
REFL
—V
REFH
V
Input capacitance C
ADIN
—4.55.5pF
Input resistance R
ADIN
—3 5kΩ
Analog source
resistance
10-bit mode
f
ADCK
> 4MHz
f
ADCK
< 4MHz
R
AS
—
—
—
—
5
10
kΩ
External to
MCU
8-bit mode (all valid f
ADCK
)——10
ADC conversion
clock frequency
High speed (ADLPC = 0)
f
ADCK
0.4 — 8.0
MHz
Low power (ADLPC = 1) 0.4 — 4.0
+
–
+
–
V
AS
R
AS
C
AS
V
ADIN
Z
AS
Pad
leakage
due to
input
protection
Z
ADIN
SIMPLIFIED
INPUT PIN EQUIVALENT
CIRCUIT
R
ADIN
ADC SAR
ENGINE
SIMPLIFIED
CHANNEL SELECT
CIRCUIT
INPUT PIN
R
ADIN
C
ADIN
INPUT PIN
R
ADIN
INPUT PIN
R
ADIN