MC9S08LG32 Datasheet, PDF (26/47 Pages) Freescale Semiconductor, Inc – 8-bit HCS08 Central Processor Unit (CPU)

Electrical Characteristics
Table 12. 12-bit ADC Operating Conditions (continued)
Characteristic
Conditions
Symb
Min
Typ¹
Max Unit
Comment
Input
Resistance
—
R_ADIN
—
5
7
kΩ
—
Analog Source
Resistance
12-bit mode
f_ADCK > 4MHz
f_ADCK < 4MHz
R_AS
—
—
—
—
kΩ External to MCU
2
5
10-bit mode
f_ADCK > 4MHz
f_ADCK < 4MHz
—
—
5
—
—
10
8-bit mode (all valid f_ADCK)
—
—
10
ADC
High Speed (ADLPC = 0)
f_ADCK
0.4
—
8.0
MHz
—
Conversion
Clock Freq.
Low Power (ADLPC = 1)
0.4
—
4.0
1 _{Typical values assume VDDAD = 5.0 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
SIMPLIFIED
INPUT PIN EQUIVALENT
CIRCUIT
Pad
leakage
due to
input
protection
+
V_ADIN
–
Z_ADIN
SIMPLIFIED
CHANNEL SELECT
CIRCUIT
R_ADIN
ADC SAR
ENGINE
R_ADIN
INPUT PIN
R_ADIN
INPUT PIN
R_ADIN
INPUT PIN
C_ADIN
Figure 18. ADC Input Impedance Equivalency Diagram
MC9S08LG32 Series Data Sheet, Rev. 4
26
Freescale Semiconductor
Preliminary - Subject to Change Without Notice