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| MC68HC08GP32A Datasheet, PDF (244/258 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Electrical Specifications
20.12 ADC Characteristics
Characteristic(1)
Symbol
Min
Max
Unit
Comments
Supply voltage
Input voltages
Resolution
Absolute accuracy
(VREFL = 0 V,
VREFH = VDDAD = 5 V ± 10%)
ADC internal clock
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
VDDAD
VADIN
BAD
AAD
fADIC
RAD
tADPU
tADC
tADS
ZADI
FADI
CADI
â
2.7
(VDD min)
0
8
â1
0.5
VREFL
16
16
5
00
FE
â
â1
5.5
(VDD max)
VDDAD
8
VDDAD should be tied to
V
the same potential as VDD
via separate traces.
V
VADIN ⤠VREFH
Bits
+1
LSB
Includes quantization
1.048
VREFH
17
â
01
FF
(20) 8
+1
MHz
V
tAIC cycles
tAIC cycles
tAIC cycles
Hex
Hex
pF
µA
tAIC = 1/fADIC, tested only
at 1 MHz
VREFH = VDDAD
VREFL = VSSAD
VIN = VREFL
VIN = VREFH
Not tested
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.
MC68HC08GP32A ⢠MC68HC08GP16A Data Sheet, Rev. 1.0
244
Freescale Semiconductor
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