MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 589

• Manufacturer Part Number: MC9S12E32CFU
• Description: HCS12 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

1
2
3
A.6
This section describes the characteristics of the analog to digital converter.
The ATD is specified and tested for both the 3.3V and 5V range. For ranges between 3.3V and 5V the ATD
accuracy is generally the same as in the 3.3V range but is not tested in this range in production test.
A.6.1
The
The following constraints exist to obtain full-scale, full range results:
VSSA VRL VIN VRH VDDA This constraint exists since the sample buffer amplifier can not
drive beyond the power supply levels that it ties to. If the input level goes outside of this range it will
effectively be clipped.
Freescale Semiconductor
Conditions are shown in
Num C
Full accuracy is not guaranteed when differential voltage is less than 4.75V
The minimum time assumes a final sample period of 2 ATD clocks cycles while the maximum time assumes a final sample
period of 16 ATD clocks.
Reduced accuracy see
1
2
3
4
5
6
7
Table A-19
D Reference Potential
C Differential Reference Voltage
D ATD Clock Frequency
D ATD 10-Bit Conversion Period
D ATD 8-Bit Conversion Period
D Stop Recovery Time (V
P Reference Supply current
ATD Characteristics
ATD Operating Characteristics — 5V Range
shows conditions under which the ATD operates.
Conv, Time at 4.0MHz
Conv, Time at 2.0MHz ATD Clock f
Conv, Time at 2.0MHz ATD Clock f
Table A-4
Table A-22
Rating
DDA
unless otherwise noted. Supply Voltage 5V-10% <= VDDA <=5V+10%
Table A-19. 5V ATD Operating Characteristics
and
= 5.0 Volts)
1
Table
3
ATD Clock f
MC9S12E128 Data Sheet, Rev. 1.07
A-23.
Clock Cycles
Clock Cycles
ATDCLK
ATDCLK
ATDCLK
High
Low
2
1
V
N
T
T
Symbol
N
f
T
RH
ATDCLK
CONV10
CONV10
CONV10
CONV8
CONV8
I
V
V
t
REF
SR
RH
–V
RL
RL
V
V
4.75
Min
DDA/2
0.5
3.5
14
12
—
—
SSA
7
6
Appendix A Electrical Characteristics
Typ
5.0
—
—
—
—
—
—
—
—
—
—
V
0.375
V
Max
5.25
DDA/2
2.0
DDA
28
14
26
13
20
7
Cycles
Cycles
MHz
Unit
mA
V
V
V
s
s
s
s
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