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| MC68HC908GT16 Datasheet, PDF (398/412 Pages) Motorola, Inc – Microcontrollers | |||
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Electrical Specifications
23.16 ADC Characteristics
Characteristic(1)
Symbol
Min
Max
Unit
Comments
Supply voltage
VDDA
2.7
5.5
(VDD min) (VDD max)
V
VDDA should be tied to
the same potential as
VDD via separate
traces.
Input voltages
VADIN
0
VDDA
V
Resolution
BAD
8
8
Bits
Absolute accuracy
(VREFL = 0 V,
AAD
â
VREFH = VDDA = 5 V ± 10%)
±1
LSB
Includes quantization
ADC internal clock
fADIC
0.5
1.048
MHz
tAIC = 1/fADIC, tested
only at 1 MHz
Conversion range
RAD
VREFL
VREFH
V
VSSA ⤠VADIN ⤠VDDA
Power-up time
tADPU
16
tAIC cycles
ADC voltage reference high
VREFH VSSA - 0.1 VDDA + 0.1
V
VREFL ⤠VREFH
ADC voltage reference low
VREFL VSSA - 0.1 VDDA + 0.1
V
VREFL ⤠VREFH
Conversion time
tADC
16
17
tAIC cycles
Sample time(2)
tADS
5
â
tAIC cycles
Zero input reading(3)
ZADI
00
01
Hex
VIN = VREFL
Full-scale reading(3)
FADI
FE
FF
Hex
VIN = VREFH
Input capacitance
CADI
â
8
pF
Not tested
Input leakage(4)
Port B
â
â
±1
µA
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 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.
Technical Data
398
MC68HC908GT16 ⢠MC68HC908GT8 â Rev. 2
Electrical Specifications
MOTOROLA
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