MC68HC11A8
TECHNICAL DATA
ELECTRICAL CHARACTERISTICS
MOTOROLA
A-17
A
NOTES:
1.Source impedances greater than 10 k
affect accuracy adversely because of input leakage.
2.Performance verified down to 2.5 V
V
R
, but accuracy is tested and guaranteed at
V
R
= 5 V
±
10%.
Table A-6 Analog-To-Digital Converter Characteristics
V
DD
= 5.0 Vdc
±
10%, V
SS
= 0 Vdc, T
A
= T
L
to T
H
, 750 kHz
≤
E
≤
3.0 MHz, unless otherwise noted
Characteristic
Parameter
Min
Absolute
2.0 MHz
Max
—
±
1/2
3.0 MHz
Max
—
±
1
Unit
Resolution
Non-Linearity
Number of Bits Resolved by A/D Converter
Maximum Deviation from the Ideal A/D Transfer
Characteristics
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 Unadjust-
ed Error
Quantization
Error
Absolute Accu-
racy
the Full-Scale Weighted Equivalent of the Binary
Output Code, All Error Sources Included
Conversion
Range
V
RH
Maximum Analog Reference Voltage (Note 2)
—
—
8
—
Bits
LSB
Zero Error
—
—
±
1/2
±
1
LSB
—
—
±
1/2
±
1
LSB
Maximum Sum of Non-Linearity, Zero Error, and
Full-Scale Error
Uncertainty Because of Converter Resolution
—
—
±
1/2
±
1 1/2
LSB
—
—
±
1/2
±
1/2
LSB
Difference Between the Actual Input Voltage and
—
—
±
1
±
2
LSB
Analog Input Voltage Range
V
RL
—
V
RH
V
RH
V
V
RL
—
V
DD
+ 0.1
V
DD
+
0.1
V
RH
V
V
RL
Minimum Analog Reference Voltage (Note 2)
V
SS
–
0.1
3
—
V
RH
V
V
R
Minimum Difference between V
RH
and V
RL
(Note 2)
Total Time to Perform a Single Analog-to-Digital
Conversion:
a. E Clock
b. Internal RC Oscillator
Conversion Result Never Decreases with an In-
crease in Input Voltage and has no Missing Codes
Conversion Result when V
in
= V
RL
—
—
—
V
Conversion
Time
—
—
—
32
—
—
t
cyc
+ 32
—
—
t
cyc
+ 32
—
t
cyc
μ
s
—
Monotonicity
Guaranteed
Zero Input
Reading
Full Scale
Reading
Sample Acqui-
sition Time
00
—
—
—
Hex
Conversion Result when V
in
= V
RH
—
—
FF
FF
Hex
Analog Input Acquisition Sampling Time:
a. E Clock
b. Internal RC Oscillator
Input Capacitance during Sample PE0-PE7
—
—
—
12
—
—
12
—
—
12
—
t
cyc
μ
s
pF
Sample/Hold
Capacitance
Input Leakage
20 (Typ)
Input Leakage on A/D PinsPE0-PE7
V
RL
, V
RH
—
—
—
—
400
1.0
400
1.0
nA
μ
A