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| MC68HC08BD24 Datasheet, PDF (236/244 Pages) Motorola, Inc – HCMOS Microcontroller Unit | |||
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19.9 ADC Characteristics
Characteristic(1)
Supply voltage
Symbol
VDDAD
Min
4.5
(VDD
min)
Max
5.5
(VDD
max)
Unit
V
Comments
Input voltages
VADIN
0
--2----
3
VDD
V
Resolution
Absolute accuracy
(VSS = 0 V, VDD = 5 V ± 10%)
ADC internal clock
BAD
8
8
AAD
â
±2
fADIC
0.375
6
Bits
LSB
MHz
Includes quantization
tAIC = 1/fADIC, tested
only at 1.5 MHz
Conversion range
RAD
VSS
--2----
3
VDD
V
Power-up time
tADPU
16
tAIC cycles
Conversion time
tADC
12
13
tAIC cycles
Sample time(2)
tADS
4
â
tAIC
cycles
Zero input reading(3)
Full-scale reading(3)
ZADI
00
02
Hex
FADI
FD
FF
Hex
Input capacitance
Input leakage(4)
Port C
CADI
â
8
pF
â
â
±1
µA
Not tested
NOTES:
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted.
2. Source impedances greater than 10 k⦠adversely affect internal RC charging time during input sampling.
3. Zero-input/full-scale reading requires sufficient decoupling measures for accurate conversions.
4. The external system error caused by input leakage current is approximately equal to the product of R source and input
current.
Technical Data
236
MC68HC08BD24 â Rev. 1.1
Freescale Semiconductor
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