mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1253

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

A.2
This section describes the characteristics of the analog-to-digital converter.
A.2.1
The
The following constraints exist to obtain full-scale, full range results:
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.
1
2
Freescale Semiconductor
Conditions are shown in
Num C
Full accuracy is not guaranteed when differential voltage is less than 4.50 V
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.
1
2
3
4
5
6
7
8
Table A-12
D Reference potential
C Differential reference voltage
D ATD clock frequency
D ATD 10-bit conversion period
D ATD 8-Bit conversion period
D Recovery time (V
P Reference supply current 2 ATD blocks on
P Reference supply current 1 ATD block on
V
SSA
ATD Characteristics
ATD Operating Characteristics
Low
High
Clock cycles
Conv, time at 2.0 MHz ATD clock f
Clock cycles
Conv, time at 2.0 MHz ATD clock f
V
and
RL
Table A-13
Table A-4
2
2
V
DDA
IN
= 5.0 Volts)
V
unless otherwise noted, supply voltage 4.5 V < V
Table A-12. ATD 5-V Operating Characteristics
Rating
RH
show conditions under which the ATD operates.
1
MC9S12XDP512 Data Sheet, Rev. 2.17
V
DDA
ATDCLK
ATDCLK
N
V
T
Symbol
N
f
T
ATDCLK
RH
CONV10
CONV10
CONV8
CONV8
t
I
I
V
V
REC
REF
REF
RH
RL
-V
RL
V
DDA
V
4.50
DDA
Min
0.5
14
12
SSA
—
—
—
7
6
< 5.5 V
/2
Appendix A Electrical Characteristics
5.00
Typ
—
—
—
—
—
—
—
—
—
V
0.750
0.375
V
Max
DDA
5.5
2.0
28
14
26
13
20
DDA
/2
Cycles
Cycles
MHz
Unit
mA
mA
V
V
V
1253
s
s
s