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HCS12 Datasheet(PDF) 97 Page - NXP Semiconductors

Part # HCS12
Description  HCS12 Microcontrollers
PDF  126 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

HCS12 Datasheet(HTML) 97 Page - NXP Semiconductors

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Device User Guide — 9S12KT256DGV1/D V01.09
97
Freescale Semiconductor
A.5 ATD Characteristics
This section describes the characteristics of the analog to digital converter.
A.5.1 ATD Operating Characteristics
The Table A-11 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.
Table A-11 5V ATD Operating Characteristics
Conditions are shown in Table A-4 unless otherwise noted
Num C
Rating
Symbol
Min
Typ
Max
Unit
1
D
Reference Potential
Low
High
VRL
VRH
VSSA
VDDA/2
VDDA/2
VDDA
V
V
2
C Differential Reference Voltage1
NOTES:
1. Full accuracy is not guaranteed when differential voltage is less than 4.75V
VRH-VRL
4.75
5.0
5.25
V
3
D ATD Clock Frequency
fATDCLK
0.5
2.0
MHz
4
D
ATD 10-Bit Conversion Period
Clock Cycles2
Conv, Time at 2.0MHz ATD Clock fATDCLK
Conv, Time at 4.0MHz3 ATD Clock fATDCLK
2. 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.
3. Reduced accuracy see Table A-14 and Table A-15.
NCONV10
TCONV10
TCONV10
14
7
3.5
28
14
7
Cycles
µs
µs
5
D
ATD 8-Bit Conversion Period
Clock Cycles(1)
Conv, Time at 2.0MHz ATD Clock fATDCLK
NCONV8
TCONV8
12
6
26
13
Cycles
µs
6
D Stop Recovery Time (VDDA=5.0 Volts)
tSR
20
µs
7
P Reference Supply current (two ATD modules)
IREF
0.750
mA
8
P Reference Supply current (one ATD module)
IREF
0.375
mA



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