Datasheet

Electrical Characteristics
MCF51AC256 ColdFire Microcontroller Data Sheet, Rev.7
Freescale Semiconductor 29
Figure 10. ADC Input Impedance Equivalency Diagram
Table 14. 5 Volt 12-bit ADC Characteristics (V
REFH
= V
DDA
, V
REFL
= V
SSA
)
Num C Characteristic Conditions Symb Min Typical
1
Max Unit Comment
1T
Supply current
ADLPC = 1
ADLSMP = 1
ADCO = 1
I
DDA
—133 —A
2T
Supply current
ADLPC = 1
ADLSM = 0
ADCO = 1
I
DDA
—218 —A
3T
Supply current
ADLPC = 0
ADLSMP = 1
ADCO = 1
I
DDA
—327 —A
4D
Supply current
ADLPC = 0
ADLSMP = 0
ADCO = 1
I
DDA
—0.582 1 mA
5 T Supply current Stop, reset, module off I
DDA
—0.011 1 A
6P
ADC
asynchronous
clock source
High speed (ADLPC = 0)
f
ADACK
23.3 5
MHz
t
ADACK
=
1/f
ADACK
Low power (ADLPC = 1) 1.25 2 3.3
+
–
+
–
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