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| MC68HC908LB8_05 Datasheet, PDF (225/234 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers | |||
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5.0-Volt ADC Characteristics
14
5 V @ 25°C
12
MCU
10
8
OSC1
6
VDD
4
REXT
2
0
0
10
20
30
40
50
Resistor, REXT (kâ¦)
Figure 20-2. RC versus Frequency (5 Volts @ 25°C)
20.8 5.0-Volt ADC Characteristics
Characteristic
Symbol
Min
Max
Unit
Comments
Supply voltage
VDDAD
4.5
(VDD min)
5.5
(VDD max)
V
â
Input voltages
VADIN
VSS
VDD
V
â
Resolution
BAD
8
8
Bits
â
Absolute accuracy
AAD
± 0.5
± 1.5
LSB
Includes quantization
ADC internal clock
fADIC
0.5
1.048
MHz
tADIC = 1/fADIC,
tested only at 1 MHz
Conversion range
RAD
VSS
VDD
V
â
Power-up time
tADPU
16
â
tADIC cycles
tADIC = 1/fADIC
Conversion time
tADC
16
17
tADIC cycles
tADIC = 1/fADIC
Sample time(1)
tADS
5
â
tADIC cycles
tADIC = 1/fADIC
Zero input reading(2)
ZADI
00
01
Hex
VIN = VSS
Full-scale reading(3)
FADI
FE
FF
Hex
VIN = VDD
Input capacitance
CADI
â
8
pF
Not tested
Input leakage(3)
â
â
±1
µA
â
NOTES:
1. Source impedances greater than 10 k⦠adversely affect internal RC charging time during input sampling.
2. Zero-input/full-scale reading requires sufficient decoupling measures for accurate conversions.
3. The external system error caused by input leakage current is approximately equal to the product of R source and input
current.
MC68HC908LB8 Data Sheet, Rev. 1
Freescale Semiconductor
225
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