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| MC68HC908GR8 Datasheet, PDF (263/286 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers | |||
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ADC Characteristics
23.12 ADC Characteristics
Characteristic(1)
Symbol
Supply voltage
VDDAD
Input voltages
Resolution
Absolute accuracy
(VREFL = 0 V, VDDAD = VREFH = 5 V ± 10%)
ADC internal clock
VADIN
BAD
AAD
fADIC
Min
2.7
(VDD
min)
0
8
ââ
0.5
Conversion range
Power-up time
Conversion time
Sample time(2)
Zero input reading(3)
Full-scale reading(3)
Input capacitance
Input leakage(4)
Port B
RAD
tADPU
tADC
tADS
ZADI
FADI
CADI
â
VREFL
16
16
5
00
FE
â
â
Max
5.5
(VDD
max)
VDDAD
8
±1
1.048
VREFH
17
â
01
FF
20
±1
Unit
V
V
Bits
Comments
VDDAD should be tied to
the same potential as
VDD via separate
traces.
VADIN <= VREFH
LSB
Includes quantization
MHz
V
tAIC cycles
tAIC cycles
tAIC cycles
Hex
Hex
pF
tAIC = 1/fADIC, tested
only at 1 MHz
VREFH = VDDAD
VREFL = VSSAD
VIN = VREFL
VIN = VREFH
Not tested
μA
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 kΩ 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.
MC68HC908GR8 ⢠MC68HC908GR4 Data Sheet, Rev. 7
Freescale Semiconductor
263
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