MCF51JM64 FREESCALE [Freescale Semiconductor, Inc], MCF51JM64 Datasheet - Page 24

• Manufacturer Part Number: MCF51JM64
• Description: MCF51JM128 ColdFire Microcontroller
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Preliminary Electrical Characteristics
24
1
2
Input Resistance
Analog Source
Resistance
ADC Conversion
Clock Freq.
Characteristic
Typical values assume V
only and are not tested in production.
DC potential difference.
V
AS
+
–
12 bit mode
10 bit mode
8 bit mode (all valid f
High Speed (ADLPC=0)
Low Power (ADLPC=1)
R
AS
Table 13. 5 Volt 12-bit ADC Operating Conditions (continued)
f
f
f
f
DDAD
ADCK
ADCK
ADCK
ADCK
Conditions
Figure 9. ADC Input Impedance Equivalency Diagram
= 5.0V, Temp = 25°C, f
> 4MHz
< 4MHz
> 4MHz
< 4MHz
C
AS
Z
AS
MCF51JM128 ColdFire Microcontroller, Rev. 2
ADCK
)
V
+
–
ADIN
Symb
R
f
ADCK
R
INPUT PIN EQUIVALENT
ADIN
ADCK
Pad
leakage
due to
input
protection
AS
INPUT PIN
INPUT PIN
INPUT PIN
SIMPLIFIED
=1.0MHz unless otherwise stated. Typical values are for reference
CIRCUIT
Min
0.4
0.4
—
—
—
—
—
—
Typ
—
—
—
—
—
—
—
3
1
Z
ADIN
Max
CHANNEL SELECT
8.0
4.0
10
10
R
R
R
R
5
2
5
5
ADIN
ADIN
ADIN
ADIN
SIMPLIFIED
CIRCUIT
MHz
Unit
kΩ
kΩ
Freescale Semiconductor
External to MCU
C
ADIN
Comment
ADC SAR
ENGINE