Datasheet

Electrical Specifications
MC68HC908JL3E Family Data Sheet, Rev. 4
144 Freescale Semiconductor
Figure 16-6. Typical Wait Mode I
DD
(MC68HRC908JL3E/JK3E/JK1E),
with All Modules Turned Off (25 °C)
16.12 ADC Characteristics
Table 16-10. ADC Characteristics
Characteristic Symbol Min Max Unit Comments
Supply voltage
V
DDAD
2.7
(V
DD
min)
5.5
(V
DD
max)
V
Input voltages
V
ADIN
V
SS
V
DD
V
Resolution
B
AD
88Bits
Absolute accuracy
A
AD
± 0.5 ± 1.5 LSB Includes quantization
ADC internal clock
f
ADIC
0.5 1.048 MHz
t
AIC
= 1/f
ADIC
, tested
only at 1 MHz
Conversion range
R
AD
V
SS
V
DD
V
Power-up time
t
ADPU
16
t
AIC
cycles
Conversion time
t
ADC
14 15
t
AIC
cycles
Sample time
(1)
1. Source impedances greater than 10 kΩ adversely affect internal RC charging time during input sampling.
t
ADS
5—
t
AIC
cycles
Zero input reading
(2)
2. Zero-input/full-scale reading requires sufficient decoupling measures for accurate conversions.
Z
ADI
00 01 Hex
V
IN
= V
SS
Full-scale reading
(3)
F
ADI
FE FF Hex
V
IN
= V
DD
Input capacitance
C
ADI
— (20) 8 pF Not tested
Input leakage
(3)
Port B/port D
3. The external system error caused by input leakage current is approximately equal to the product of R source and input
current.
—— ± 1 μA
0
0.25
0.5
0.75
1
1.25
1.50
1.75
2
01 23 456 78
I
DD
(mA)
f
OP
or f
BUS
(MHz)
MC68HRC908JL3E/JK3E/JK1E
5.5 V
3.3 V