Datasheet

MC9S08LG32 Series Data Sheet, Rev. 9
Electrical Characteristics
Freescale Semiconductor26
Figure 18. ADC Input Impedance Equivalency Diagram
Input
Resistance
—R
ADIN
—5 7k —
Analog Source
Resistance
12-bit mode
f
ADCK
> 4MHz
f
ADCK
< 4MHz
R
AS
—
—
—
—
2
5
k External to MCU
10-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
DDAD
= 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.
2
DC potential difference.
Table 12. 12-bit ADC Operating Conditions (continued)
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