ADC Electrical Specifications
MC9S12VRP Family Reference Manual Rev. 1.3
508
NXP Semiconductors
Appendix C
ADC Electrical Specifications
This section describes the characteristics of the analog-to-digital converter.
C.1
ADC Operating Characteristics
shows conditions under which the ADC operates.
The following constraints exist to obtain full-scale, full range results:
V
SSA
V
RL
V
IN
V
RH
V
DDA
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.
Table C-1. ADC Operating Characteristics
C.1.1
Factors Influencing Accuracy
Source resistance, source capacitance and current injection have an influence on the accuracy of the ADC,
see
. A further factor is that port AD pins that are configured as output drivers switching.
C.1.1.1
Port AD Output Drivers Switching
Port AD output drivers switching can adversely affect the ADC accuracy whilst converting the analog
voltage on other port AD pins because the output drivers are supplied from the VDDA/VSSA ADC supply
pins. Although internal design measures are implemented to minimize the affect of output driver noise, it
Supply voltage 3.13 V < V
DDA
< 5.5 V, -40
o
C < T
J
< 150
o
C
Num
Rating
Symbol
Min
Typ
Max
Unit
1
Reference potential
Low
High
V
RL
V
RH
V
SSA
V
DDA
/2
—
—
V
DDA
/2
V
DDA
V
V
2
Voltage difference V
DDX
to V
DDA
VDDX
–0.1
0
0.1
V
3
Voltage difference V
SSX
to V
SSA
VSSX
–0.1
0
0.1
V
4
Differential reference voltage
1
1
Full accuracy is not guaranteed when the differential voltage is less than 4.5V
V
RH
-V
RL
3.13
5.0
5.5
V
5
ADC Clock Frequency (derived from bus clock via the
prescaler)
f
ADCCLk
0.25
8.0
MHz
6
ADC Conversion Period
2
10 bit resolution:
8 bit resolution:
2
The minimum time assumes a sample time of 4 ADC clock cycles. The maximum time assumes a sample time of 24 ADC
clock cycles and the discharge feature (SMP_DIS) enabled, which adds 2 ADC clock cycles.
N
CONV10
N
CONV8
19
17
41
39
ADC
clock
cycles
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