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MOTOROLA
A-18
ELECTRICAL CHARACTERISTICS
MC68HC11A8
TECHNICAL DATA
A
NOTES:
1.Source impedances greater than 10 k
affect accuracy adversely because of input leakage.
Table A-6a Analog-To-Digital Converter Characteristics (MC68L11A8)
V
DD
= 3.0 Vdc to 5.5 Vdc, V
SS
= 0 Vdc, T
A
= T
L
to T
H
, 750 kHz
≤
E
≤
2.0 MHz, unless otherwise noted
Characteristic
Parameter
Resolution
Number of Bits Resolved by A/D Converter
Non-Linearity
Maximum Deviation from the Ideal A/D Transfer
Characteristics
Zero Error
Difference Between the Output of an Ideal and an
Actual for Zero Input Voltage
Full Scale Error
Difference Between the Output of an Ideal and an
Actual A/D for Full-Scale Input Voltage
Total Unadjusted
Error
Full-Scale Error
Quantization Error
Uncertainty Because of Converter Resolution
Absolute Accuracy Difference Between the Actual Input Voltage and
the Full-Scale Weighted Equivalent of the Binary
Output Code, All Error Sources Included
Conversion Range
Analog Input Voltage Range
V
RH
Maximum Analog Reference Voltage(Note 2)
V
RL
Minimum Analog Reference Voltage (Note 2)
V
R
Minimum Difference between V
RH
and V
RL
(Note 2)
Conversion Time
Total Time to Perform a Single Analog-to-Digital
Conversion:
a. E Clock
b. Internal RC Oscillator
Monotonicity
Conversion Result Never Decreases with an In-
crease in Input Voltage and has no Missing Codes
Zero Input Reading
Conversion Result when V
in
= V
RL
Full Scale Reading
Conversion Result when V
in
= V
RH
Sample Acquisition
Time
a. E Clock
b. Internal RC Oscillator
Sample/Hold Ca-
pacitance
Input Leakage
Input Leakage on A/D PinsPE0-PE7
V
RL
, V
RH
Min
—
—
Absolute
8
—
Max
—
±
1
Unit
Bits
LSB
—
—
±
1
LSB
—
—
±
1
LSB
Maximum Sum of Non-Linearity, Zero Error, and
—
—
±
1 1/2
LSB
—
—
—
—
±
1/2
±
2
LSB
LSB
V
RL
V
RL
—
—
—
—
V
RH
V
V
V
V
V
DD
+ 0.1
V
RH
—
V
SS
– 0.1
3
—
—
—
32
—
—
t
cyc
+ 32
—
t
cyc
μ
s
—
Guaranteed
00
—
—
—
—
FF
Hex
Hex
Analog Input Acquisition Sampling Time:
—
—
—
12
—
—
12
—
t
cyc
μ
s
pF
Input Capacitance during Sample PE0-PE7
20 (Typ)
—
—
—
—
400
1.0
nA
μ
A