MOTOROLA
13-16
ELECTRICAL SPECIFICATIONS
MC68HC11G5
13.8
A/D CONVERTER CHARACTERISTICS
(VDD = 5.0 Vdc
±
10%, VSS = 0 Vdc, TA = TL to TH, E = 750kHz to 2.1MHz unless otherwise noted)
Characteristic
Parameter
Min
Absolute
Max
Unit
Resolution
Number of bits resolved by the A/D
10
—
—
Bits
Nonlinearity
Maximum deviation from the ideal A/D transfer
characteristics
—
—
TBD
LSB
Zero Error
Difference between the output of an ideal and an
actual A/D for zero input voltage
—
—
TBD
LSB
Full Scale Error
Difference between the output of an ideal and an
actual A/D for full scale input voltage
—
—
TBD
LSB
Total Unadjusted Error
Maximum sum of Nonlinearity, zero error and
full scale error
—
—
TBD
LSB
Quantization Error
Uncertainty due to converter resolution
—
—
±
0.5
LSB
Absolute Accuracy
(See Note 1)
Difference between the actual input voltage and the
full scale weighted equivalent of the binary output
code, all error sources included
—
—
TBD
LSB
Conversion Range
(See Notes 3 and 4)
Analog input voltage range
Vrl
—
Vrh
V
Vrh (See Note 2)
Vrl (See Note 2)
Delta Vr (See Note 2)
Conversion Time
Maximum analog reference voltage
Vrl
—
VDD + 0.1
Vrh
—
V
Minimum analog reference voltage
VSS - 0.1
0
—
V
Minimum difference between Vrh and Vrl
Total time to perform a single analog to digital
conversion:
1. E Clock
2. Internal RC Oscillator
—
V
—
—
36
—
—
tcyc + 24
tcyc
μ
s
Monotonicity
Conversion result never decreases with an increase
in input voltage and has no missing codes
Guaranteed
Zero Input Reading
(See Note 3)
Conversion result when Vin = Vrl
$000
—
—
Hex
Full Scale reading
(See Note 4)
Conversion result when Vin = Vrh
—
—
$3FF
Hex
Sample Acquisition Time
Analog Input Acquisition sampling time:
1. E Clock
2. Internal RC Oscillator
—
—
13
—
—
8.7
tcyc
μ
s
pF
Sample Hold Capacitance Input capacitance during sample PE0-PE7
—
35 (Typ)
—
Input Leakage
Input leakage on A/D pins:
PE0-PE7
Vrl, Vrh
—
—
—
—
100
250
nA
μ
A
NOTES:
1.
2.
3.
4.
Source impedances greater then 10k
will adversely affect accuracy, due mainly to input leakage.
Performance verified down to 2.5V Delta Vr, but accuracy is tested and guaranteed at Delta Vr = 5V
±
10%.
Minimum analog input voltage should not go below VSS - 0.3V.
Maximum analog input voltage should not exceed 1.125Vrh.