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| MC908AB32CFUE Datasheet, PDF (379/392 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Electrical Specifications
23.10 ADC Characteristics
Characteristic(1)
Symbol
Min
Max
Unit
Comments
Supply voltage
VDDAREF should be tied
VDDAD
4.5
5.5
(VDD min) (VDD max)
V
to the same potential as
VDD via separate
traces.
Input voltages
VADIN
0
VDDAREF
VREFH
1.5
VDDAREF
V
VADIN ⤠VREFH
Resolution
BAD
8
8
Bits
Absolute accuracy
(VREFL = 0 V,
VREFH = VDDAD = 5 V ± 10%)
ADC internal clock
AAD
fADIC
± 1/2
0.5
±1
1.048
LSB
MHz
Includes quantization
tAIC = 1/fADIC, tested
only at 1 MHz
Conversion range
RAD
VREFL
VREFH
V
VREFL = VSSA
Power-up time
tADPU
16
tAIC cycles
Conversion time
Sample time(2)
Zero input reading(3)
Full-scale reading(3)
tADC
16
tADS
5
ZADI
00
FADI
FE
17
tAIC cycles
â
tAIC cycles
01
Hex
FF
Hex
VIN = VREFL
VIN = VREFH
Input capacitance
Input leakage(4)
Port B
CADI
â
(20) 8
pF
â
â
±1
µA
Not tested
Notes:
1. VDD = 5.0 Vdc ± 10%, VDDA = VDDAREF = 5.0 Vdc ± 10%, VREFH = 5.0 Vdc ± 10%, VSS = 0 Vdc, VREFL = VSSA = 0 Vdc
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.
MC68HC908AB32 â Rev. 1.1
Freescale Semiconductor
Electrical Specifications
Technical Data
379
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