Datasheet

MC9S08LL64 Series MCU Data Sheet, Rev. 7
ADC Characteristics
Freescale Semiconductor34
Figure 25. ADC Input Impedance Equivalency Diagram
2 Ground voltage
Delta to V
SS
(V
SS
– V
SSA
)
2
ΔV
SSA
–100 0 100 mV
3 Reference voltage high — V
REFH
1.8 V
DDA
V
DDA
V
4 Reference voltage low — V
REFL
V
SSA
V
SSA
V
SSA
V
5 Input voltage — V
ADIN
V
REFL
—V
REFH
V
6 Input capacitance 8/10/12-bit modes C
ADIN
—4 5pF
7 Input resistance — R
ADIN
—5 7kΩ
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 (continued)
No. Characteristic Conditions Symb Min Typ
1
Max Unit
+
–
+
–
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