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| MC68HC908GP32_08 Datasheet, PDF (246/266 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers | |||
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Electrical Specifications
19.12 ADC Characteristics
Characteristic(1)
Symbol
Min
Max
Unit
Comments
Supply voltage
VDDAD
2.7
(VDD min)
5.5
(VDD max)
VDDAD should be tied to
V
the same potential as VDD
via separate traces.
Input voltages
VADIN
0
Resolution
BAD
8
Absolute accuracy
(VREFL = 0 V,
AAD
â
VREFH = VDDAD = 5 V ± 10%)
ADC internal clock
fADIC
0.5
VDDAD
8
±1
1.048
V
Bits
LSB
MHz
VADIN ⤠VREFH
Includes quantization
tAIC = 1/fADIC, tested only
at 1 MHz
Conversion range
Power-up time
Conversion time
Sample time(2)
RAD
tADPU
tADC
tADS
VREFL
16
16
5
VREFH
17
â
V
tAIC cycles
tAIC cycles
tAIC cycles
VREFH = VDDAD
VREFL = VSSAD
Zero input reading(3)
ZADI
00
01
Hex
VIN = VREFL
Full-scale reading(3)
Input capacitance
Input leakage(4)
Port B
FADI
FE
CADI
â
â
â
FF
Hex
(20) 8
pF
±1
µA
VIN = VREFH
Not tested
Notes:
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, VDDAD = 5.0 Vdc ± 10%, VSSAD = 0 Vdc, VREFH = 5.0 Vdc ± 10%, VREFL = 0
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.
MC68HC908GP32 Data Sheet, Rev. 10
246
Freescale Semiconductor
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