Datasheet

MC56F8006/MC56F8002 Digital Signal Controller, Rev. 4
Specifications
Freescale Semiconductor66
8.16 ADC Specifications
Figure 37. ADC Input Impedance Equivalency Diagram
Table 36. ADC Operating Conditions
Characteristic Conditions Symb Min Typ
1
1
Typical values assume V
DDAD
= 3.0 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
Input voltage V
ADIN
V
REFL
2
2
V
REFL
= V
SSA
—V
REFH
3
3
V
REFH
= V
DDA
V
Input
capacitance
C
ADIN
—4.55.5pF
Input resistance R
ADIN
—5 7k
Analog source
resistance
12-bit mode
f
ADCK
> 4 MHz
f
ADCK
< 4 MHz
R
AS
—
—
—
—
2
5
k External to MCU
10-bit mode
f
ADCK
> 4 MHz
f
ADCK
< 4 MHz
—
—
—
—
5
10
8-bit mode (all valid f
ADCK
)——10
ADC conversion
clock freq.
High speed (ADLPC=0) f
ADCK
0.4 — 8.0 MHz
Low power (ADLPC=1) 0.4 — 4.0
+
–
+
–
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