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MC68711E20CFNE3 Datasheet, PDF (166/242 Pages) – | |||
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Electrical Characteristics
10.13 Analog-to-Digital Converter Characteristics
Characteristic(1)
Parameter(2)
Min
Resolution
Non-linearity
Zero error
Full scale error
Total unadjusted
error
Quantization
error
Absolute
accuracy
Conversion
range
VRH
VRL
âVR
Number of bits resolved by A/D converter
â
Maximum deviation from the ideal A/D transfer
characteristics
â
Difference between the output of an ideal and an
actual for 0 input voltage
â
Difference between the output of an ideal and an
actual A/D for full-scale input voltage
â
Maximum sum of non-linearity, zero error, and
full-scale error
â
Uncertainty because of converter resolution
â
Difference between the actual input voltage and
the full-scale weighted equivalent of the binary
â
output code, all error sources included
Analog input voltage range
VRL
Maximum analog reference voltage(3)
Minimum analog reference voltage(2)
Minimum difference between VRH and VRL(2)
VRL
VSS â0.1
3
Absolute
8
â
â
â
â
â
â
â
â
â
â
2.0 MHz 3.0 MHz Uni
Max
Max
t
â
â Bits
±1/2
±1
LS
B
±1/2
±1
LS
B
±1/2
±1
LS
B
±1/2
±1/2
LS
B
±1/2
±1/2
LS
B
±1
±2
LS
B
VRH
VRH
V
VDD +0.1 VDD +0.1 V
VRH
VRH
V
â
â
V
Conversion
time
Total time to perform a single A/D conversion:
E clock
Internal RC oscillator
â
â
32
â
â
tCY
â
tCYC+32
tCYC+32
C
µs
Monotonicity
Conversion result never decreases with an
increase in input voltage; has no missing codes
â
Guaranteed
â
â
â
Zero input reading Conversion result when VIn = VRL
00
â
â
â Hex
Full scale
reading
Conversion result when VIn = VRH
â
â
FF
FF Hex
Sample
acquisition
time
Analog input acquisition sampling time:
E clock
Internal RC oscillator
â
12
â
â
â
12
Sample/hold
capacitance
Input capacitance during sample
PE[7:0]
â
20 typical
â
Input leakage
Input leakage on A/D pins
PE[7:0]
VRL, VRH
â
â
400
â
â
1.0
1. VDD = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = TL to TH, 750 kHz ⤠E ⤠3.0 MHz, unless otherwise noted
2. Source impedances greater than 10 k⦠affect accuracy adversely because of input leakage.
3. Performance verified down to 2.5 V âVR, but accuracy is tested and guaranteed at âVR = 5 V ±10%.
â
tCY
12
C
µs
â
pF
400 nA
1.0 µA
M68HC11E Family Data Sheet, Rev. 5.1
166
Freescale Semiconductor
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