MC9S12E128 MOTOROLA [Motorola, Inc], MC9S12E128 Datasheet - Page 139

• Manufacturer Part Number: MC9S12E128
• Description: MC9S12E-Family Device User Guide V01.04
• Manufacturer: MOTOROLA [Motorola, Inc]

B.7 ATD Characteristics
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.
B.7.1 ATD Operating Characteristics - 5V Range
The Table B-10 shows conditions under which the ATD operates.
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.
Conditions are shown in Table A-4 unless otherwise noted. Supply Voltage 5V-10% <= VDDA <=5V+10%
Num C
NOTES:
1. Full accuracy is not guaranteed when differential voltage is less than 4.75V
2. The minimum time assumes a final sample period of 2 ATD clocks cycles while the maximum time assumes a final sample
3. Reduced accuracy see Table B-13 and Table B-14.
1
2
3
4
5
6
7
period of 16 ATD clocks.
D
C Differential Reference Voltage
D ATD Clock Frequency
D
D
D Stop Recovery Time (V
P Reference Supply current
Reference Potential
ATD 10-Bit Conversion Period
ATD 8-Bit Conversion Period
Conv, Time at 4.0MHz
Conv, Time at 2.0MHz ATD Clock f
Conv, Time at 2.0MHz ATD Clock f
Table B-10 5V ATD Operating Characteristics
Rating
DDA
Freescale Semiconductor, Inc.
For More Information On This Product,
=5.0 Volts)
1
3
ATD Clock f
Clock Cycles
Go to: www.freescale.com
Clock Cycles
ATDCLK
ATDCLK
ATDCLK
High
Low
(1)
2
VRH-VRL
N
T
T
Symbol
N
f
T
ATDCLK
CONV10
CONV10
CONV10
VRH
CONV8
VRL
CONV8
I
t
REF
SR
Device User Guide — 9S12E128DGV1/D V01.04
VDDA/2
VSSA
4.75
Min
0.5
3.5
14
12
7
6
Typ
5.0
VDDA/2
VDDA
0.375
Max
5.25
2.0
28
14
26
13
20
7
Cycles
Cycles
MHz
Unit
mA
µs
µs
µs
µs
V
V
V
139