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MC68711E20CFNE3 Datasheet, PDF (167/242 Pages) – | |||
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MC68L11E9/E20 Analog-to-Digital Converter Characteristics
10.14 MC68L11E9/E20 Analog-to-Digital Converter Characteristics
Characteristic(1)
Parameter(2)
Min
Absolute
Max
Unit
Resolution
Number of bits resolved by A/D converter
â
8
â
Bits
Non-linearity
Maximum deviation from the ideal A/D transfer
characteristics
â
â
±1
LSB
Zero error
Difference between the output of an ideal and an
actual for 0 input voltage
â
â
±1
LSB
Full scale error
Difference between the output of an ideal and an
actual A/D for full-scale input voltage
â
â
±1
LSB
Total unadjusted
error
Maximum sum of non-linearity, zero error, and
full-scale error
â
â
±1/2
LSB
Quantization error Uncertainty because of converter resolution
â
â
±1/2
LSB
Difference between the actual input voltage and
Absolute accuracy
the full-scale weighted equivalent of the binary
â
â
±2
LSB
output code, all error sources included
Conversion range
VRH
Analog input voltage range
Maximum analog reference voltage
VRL
â
VRH
V
VRL
â
VDD + 0.1
V
VRL
Minimum analog reference voltage
VSS â0.1
â
VRH
V
âVR
Minimum difference between VRH and VRL
3.0
â
â
V
Conversion time
Monotonicity
Total time to perform a single
analog-to-digital conversion:
E clock
Internal RC oscillator
Conversion result never decreases with an
increase in input voltage and has no missing
codes
â
32
â
tCYC
â
â
tCYC+ 32
µs
â
Guaranteed
â
â
Zero input reading
Full scale reading
Conversion result when VIn = VRL
Conversion result when VIn = VRH
00
â
â
Hex
â
â
FF
Hex
Sample acquisition
time
Analog input acquisition sampling time:
E clock
Internal RC oscillator
â
12
â
tCYC
â
â
12
µs
Sample/hold
capacitance
Input capacitance during sample
PE[7:0]
â
20 typical
â
pF
Input leakage
Input leakage on A/D pins
PE[7:0]
VRL, VRH
â
â
400
nA
â
â
1.0
µA
1. VDD = 3.0 Vdc to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, 750 kHz ⤠E ⤠2.0 MHz, unless otherwise noted
2. Source impedances greater than 10 k⦠affect accuracy adversely because of input leakage.
M68HC11E Family Data Sheet, Rev. 5.1
Freescale Semiconductor
167
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