Datasheet

MC9S08LL16 Series MCU Data Sheet, Rev. 7
Electrical Characteristics
Freescale Semiconductor36
Figure 25. ADC Input Impedance Equivalency Diagram
Ref Voltage
High
V
REFH
1.8 V
DDA
V
DDA
V
Input Voltage V
ADIN
V
REFL
—V
REFH
V
Input
Capacitance
C
ADIN
—4.55.5pF
Input
Resistance
R
ADIN
—5 7kΩ
Analog Source
Resistance
12-bit mode
f
ADCK
> 4MHz
f
ADCK
< 4MHz
R
AS
—
—
—
—
2
5
kΩ External to MCU10-bit mode
f
ADCK
> 4MHz
f
ADCK
< 4MHz
—
—
—
—
5
10
8-bit mode (all valid f
ADCK
)——10
ADC
Conversion
Clock Freq.
High speed (ADLPC = 0)
f
ADCK
0.4 — 8.0
MHz
Low power (ADLPC = 1) 0.4 — 4.0
1
Typical values assume V
DDA
= 3.0 V, Temp = 25 °C, f
ADCK
=1.0 MHz unless otherwise stated. Typical values are for
reference only and are not tested in production.
2
DC potential difference.
Table 17. 12-bit ADC Operating Conditions
Characteristic Conditions Symb Min Typ
1
Max Unit Comment
+
–
+
–
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