Electrical Characteristics
SIMPLIFIED
INPUT PIN EQUIVALENT
CIRCUIT
ZADIN
SIMPLIFIED
CHANNEL SELECT
CIRCUIT
Pad
ZAS
leakage
due to
input
ADC SAR
ENGINE
RAS
RADIN
protection
+
VADIN
–
CAS
VAS
+
–
RADIN
RADIN
RADIN
INPUT PIN
INPUT PIN
INPUT PIN
CADIN
Figure 22. ADC Input Impedance Equivalency Diagram
Table 16. 12-bit ADC Characteristics (V = V , V = V
)
REFH
DDAD REFL
SSAD
C
Characteristic
Conditions
Symbol
Min.
Typical1
Max.
Unit
Comment
Supply Current
ADLPC=1
ADLSMP=1
ADCO=1
T
—
—
—
—
IDDAD
—
120
—
μA
μA
μA
mA
—
Supply Current
ADLPC=1
ADLSMP=0
ADCO=1
T
T
P
IDDAD
IDDAD
IDDAD
—
—
—
202
288
—
—
1
—
—
—
Supply Current
ADLPC=0
ADLSMP=1
ADCO=1
Supply Current
ADLPC=0
ADLSMP=0
ADCO=1
0.532
ADC
Asynchronous
Clock Source
High Speed
(ADLPC=0)
tADACK
1/fADACK
=
P
C
2
3.3
2
5
fADACK
MHz
Low Power
(ADLPC=1)
1.25
3.3
MC9S08QE8 Series, Rev. 3
Freescale Semiconductor
Preliminary
25
Subject to Change Without Notice
FREESCALE [ Freescale ]
