mcf51em256 Freescale Semiconductor, Inc, mcf51em256 Datasheet - Page 29

• Manufacturer Part Number: mcf51em256
• Description: Microcontrollers Covers Mcf51em256 Mcf51em128
• Manufacturer: Freescale Semiconductor, Inc

Table 14. 16-bit ADC Characteristics full operating range(V
Freescale Semiconductor
Supply Current
Supply Current
ADC
Asynchronous
Clock Source
Sample Time
Conversion
Time
Characteristic
V
AS
For Differential Mode, this figure
applies to both inputs
+
–
ADLPC = 1, ADHSC = 0
ADLPC = 0, ADHSC = 0
ADLPC=0, ADHSC=1
Stop, Reset, Module Off
ADLPC = 1, ADHSC = 0
ADLPC = 0, ADHSC = 0
ADLPC = 0, ADHSC = 1
See reference manual for sample times
See reference manual for conversion times
R
AS
Conditions
MCF51EM256 Series ColdFire Microcontroller Data Sheet, Rev.3
Figure 10. ADC Input Impedance Equivalency Diagram
C
AS
Z
Preliminary—Subject to Change Without Notice
AS
1
V
+
–
ADIN
C
C
P
T
INPUT PIN EQUIVALENT
Pad
leakage
due to
input
protection
INPUT PIN
INPUT PIN
INPUT PIN
f
Symb
ADACK
I
I
DDA
DDA
SIMPLIFIED
CIRCUIT
REFH
Min
—
—
—
—
—
—
—
= V
DDAD
Z
Typ
0.01
215
470
610
ADIN
2.4
6.2
5.2
2
> 1.8, V
CHANNEL SELECT
R
R
R
R
ADIN
ADIN
ADIN
ADIN
SIMPLIFIED
CIRCUIT
Max
—
—
—
—
—
—
—
REFL
= V
Electrical Characteristics
MHz
Unit
μA
μA
SSAD
C
ADIN
, F
ADC SAR
ENGINE
ADCK
ADLSMP = 0
Comment
ADCO = 1
1/f
t
ADACK
ADACK
< 8MHz)
=
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