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| MC68HC908JG16 Datasheet, PDF (317/324 Pages) Motorola, Inc – Microcontrollers | |||
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Electrical Specifications
ADC Electrical Characteristics
20.13 ADC Electrical Characteristics
Characteristic(1)
Symbol
Min
Max
Unit
Comments
Supply voltage
VDDA
4.0
VDDA should be tied to
5.5
V
the same potential as
VDD via separate
traces.
ADC reference voltage high VREFH
â
VREGA
V
ADC reference voltage low
VREFL
VSSA
â
V
Input voltages
VADIN
VREFL
VREFH
V
Resolution
BAD
8
8
Bits
Absolute accuracy
AAD
â
±1
LSB Includes quantization
ADC internal clock
fADIC
0.75
1.572
MHz
tAIC = 1/fADIC,
tested only at 1.5MHz
Conversion range
RAD
VREFL
VREFH
V
Power-up time
tADPU
16
â
tAIC
cycles
Conversion time
tADC
16
17
tAIC
cycles
Sample time(2)
tADS
5
â
tAIC
cycles
Zero input reading(3)
Full-scale reading(3)
ZADI
00
FADI
FE
01
HEX
FF
HEX
Input capacitance
Input leakage(4)
Port A
CADI
â
â
â
8
pF
Not tested
±1
µA
Notes:
1. VDD = 4.0 to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted.
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.
MC68HC908JG16 â Rev. 1.1
Freescale Semiconductor
Electrical Specifications
Technical Data
317
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