Datasheet

MCF51AC256 ColdFire Microcontroller Data Sheet, Rev.7
Electrical Characteristics
Freescale Semiconductor28
2.8 ADC Characteristics
Table 13. 5 Volt 12-bit ADC Operating Conditions
Num C Characteristic Conditions Symb Min Typical
1
1
Typical values assume V
DDA
= 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.
Max Unit Comment
1
D
Supply voltage
Absolute V
DDA
2.7 — 5.5 V
D
Delta to V
DD
(V
DD
– V
DDA
)
2
2
DC potential difference.
V
DDA
–100 0 100 mV
2 D Ground voltage
Delta to V
SS
(V
SS
– V
SSA
)
2
V
SSA
–100 0 100 mV
3D
Reference
voltage high
V
REFH
2.7 V
DDA
V
DDA
V
4D
Reference
voltage low
V
REFL
V
SSA
V
SSA
V
SSA
V
5 D Input voltage V
ADIN
V
REFL
—V
REFH
V
6C
Input
capacitance
C
ADIN
—4.55.5pF
7C
Input
resistance
R
ADIN
—3 5k
8
C
Analog source
resistance
12-bit mode
f
ADCK
> 4MHz
f
ADCK
< 4MHz
R
AS
—
—
—
—
2
5
k
External
to MCUC
10-bit mode
f
ADCK
> 4MHz
f
ADCK
< 4MHz
—
—
—
—
5
10
C
8-bit mode (all valid
f
ADCK
)
—— 10
9
D
ADC
conversion
clock
frequency
High speed
(ADLPC = 0)
f
ADCK
0.4 — 8.0
MHz
D
Low power
(ADLPC = 1)
0.4 — 4.0