MC9S08LL16_10 Datasheet, PDF (36/44 Pages) Freescale Semiconductor, Inc – MC9S08LL16 Series

Electrical Characteristics
Table 17. 12-bit ADC Operating Conditions
Characteristic
Conditions
Symb
Min
Typ¹
Max Unit
Comment
Ref Voltage
High
V_REFH
1.8
V_DDA
V_DDA
V
Input Voltage
Input
Capacitance
V_ADIN
V_REFL
—
V_REFH
V
C_ADIN
—
4.5
5.5
pF
Input
Resistance
R_ADIN
—
5
7
k
Analog Source
Resistance
12-bit mode
f_ADCK > 4MHz
f_ADCK < 4MHz
10-bit mode
f_ADCK > 4MHz
f_ADCK < 4MHz
—
—
2
—
—
5
R_AS
—
—
k External to MCU
5
—
—
10
8-bit mode (all valid f_ADCK)
—
—
10
ADC
High speed (ADLPC = 0)
0.4
—
8.0
Conversion
f_ADCK
MHz
Clock Freq.
Low power (ADLPC = 1)
0.4
—
4.0
1 _{Typical values assume VDDA = 3.0 V, Temp = 25 C, fADCK=1.0 MHz unless otherwise stated. Typical values are for}
reference only and are not tested in production.
2 _{DC potential difference.}
R_AS
V_AS
+
–
Z_AS
C_AS
+
V_ADIN
–
SIMPLIFIED
INPUT PIN EQUIVALENT
CIRCUIT
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 25. ADC Input Impedance Equivalency Diagram
MC9S08LL16 Series MCU Data Sheet, Rev. 6
36
Freescale Semiconductor