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| MC68HC908GT16_07 Datasheet, PDF (288/292 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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MC68HC08GT16
A.9 ADC Characteristics
Characteristic(1)
Symbol
Min
Max
Unit
Comments
Supply voltage
VDDA
2.7
(VDD min)
5.5
(VDD max)
VDDA should be tied to the
V
same potential as VDD via
separate traces.
Input voltages
VADIN
0
Resolution
BAD
8
Absolute accuracy
(VREFL = VSSA, VREFH = VDDA)
AAD
â
ADC internal clock
fADIC
0.5
VDDA
8
± 1.5
1.048
V
Bits
LSB
MHz
Includes quantization
tAIC = 1/fADIC, tested only
at 1 MHz
Conversion range
Power-up time
ADC voltage reference high
ADC voltage reference low
Conversion time
Sample time(2)
Zero input reading(3)
Full-scale reading(3)
Input capacitance
Input leakage(4)
Port B
RAD
tADPU
VREFH
VREFL
tADC
tADS
ZADI
FADI
CADI
â
VREFL
16
VSSA â 0.1
VSSA â 0.1
16
5
00
FE
â
â
VREFH
VDDA + 0.1
VDDA + 0.1
17
â
01
FF
8
±1
V
tAIC cycles
V
V
tAIC cycles
tAIC cycles
Hex
Hex
pF
μA
VSSA ⤠VADIN ⤠VDDA
VREFL ⤠VREFH
VREFL ⤠VREFH
VIN = VREFL
VIN = VREFH
Not tested
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, VDDA = 5.0 Vdc ± 10%, VSSA = 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.
MC68HC908GT16 ⢠MC68HC908GT8 ⢠MC68HC08GT16 Data Sheet, Rev. 5.0
288
Freescale Semiconductor
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