MC908JL3ECPE Datasheet, PDF (162/180 Pages) Freescale Semiconductor, Inc – Microcontrollers

A.5.5 ADC Characteristics
Table A-5. ADC Characteristics
Characteristic
Supply voltage
Input voltages
Resolution
Absolute accuracy
ADC internal clock
Symbol
V_DDAD
V_ADIN
B_AD
A_AD
f_ADIC
Min
2.2
(V_DD min)
V_SS
8
± 0.5
0.5
Max
5.5
(V_DD max)
V_DD
8
±2
1.048
Unit
V
V
Bits
LSB
MHz
Comments
Includes quantization
t_AIC = 1/f_ADIC, tested
only at 1 MHz
Conversion range
Power-up time
Conversion time
Sample time⁽¹⁾
Zero input reading⁽²⁾
Full-scale reading⁽³⁾
Input capacitance
Input leakage⁽³⁾
Port B/port D
R_AD
V_SS
t_ADPU
14
t_ADC
14
t_ADS
5
Z_ADI
00
F_ADI
FE
C_ADI
—
—
—
V_DD
—
15
—
01
FF
(20) 8
±1
V
t_AIC cycles
t_AIC cycles
t_AIC cycles
Hex
Hex
pF
μA
V_IN = V_SS
V_IN = V_DD
Not tested
1. Source impedances greater than 10 kΩ adversely affect internal RC charging time during input sampling.
2. Zero-input/full-scale reading requires sufficient decoupling measures for accurate conversions.
3. The external system error caused by input leakage current is approximately equal to the product of R source and input
current.
MC68HC908JL3E Family Data Sheet, Rev. 4
162
Freescale Semiconductor