Datasheet

Electrical Specifications
MC68HC908AP Family Data Sheet, Rev. 4
302 Freescale Semiconductor
22.8 5V ADC Electrical Characteristics
Table 22-7. ADC Electrical Characteristics (5V)
Characteristic
(1)
1. V
DD
= 4.5 to 5.5 Vdc, V
SS
= 0 Vdc, T
A
= T
L
to T
H
, unless otherwise noted.
Symbol Min Max Unit Notes
Supply voltage
V
DDA
4.5 5.5 V
V
DDA
is an dedicated pin and should
be tied to V
DD
on the PCB with
proper decoupling.
Input range
V
ADIN
0
V
DDA
V
V
ADIN
≤ V
DDA
Resolution
B
AD
10 10 bits
Absolute accuracy
A
AD
— ± 1.5 LSB
Includes quantization.
±0.5 LSB = ±1 ADC step.
ADC internal clock
f
ADIC
500k 1.048M Hz
t
ADIC
= 1/f
ADIC
Conversion range
R
AD
V
REFL
V
REFH
V
ADC voltage reference
high
V
REFH
—
V
DDA
+ 0.1
V
ADC voltage reference
low
V
REFL
V
SSA
– 0.1
—V
Conversion time
t
ADC
16 17
t
ADIC
cycles
Sample time
t
ADS
5—
t
ADIC
cycles
Monotonicity
M
AD
Guaranteed
Zero input reading
Z
ADI
000 001 HEX
V
ADIN
= V
REFL
Full-scale reading
F
ADI
3FD 3FF HEX
V
ADIN
= V
REFH
Input capacitance
C
ADI
— 20 pF Not tested.
Input impedance
R
ADI
20M — Ω
V
REFH
/V
REFL
I
VREF
— 1.6 mA Not tested.