Microcontrollers Data Sheet

Electrical Specifications
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
274 Freescale Semiconductor
19.13 Analog-to-Digital Converter (ADC) Characteristics
Characteristic Symbol Min Typ Max Unit Notes
Supply voltage
V
DDAD
4.5 — 5.5 V
V
DDAD
should be tied to
the same potential as
V
DD
via separate traces
Input voltages
V
ADIN
0—
V
DDAD
V
V
ADIN
<= V
DDAD
Resolution
B
AD
10 — 10 Bits
Absolute accuracy
A
AD
—— ± 4 LSB Includes quantization
ADC internal clock
f
ADIC
500 k — 1.048 M Hz
t
AIC
= 1/f
ADIC
Conversion range
R
AD
V
SSAD
—
V
DDAD
V
Power-up time
t
ADPU
16 — —
t
AIC
cycles
Conversion time
t
ADC
16 — 17
t
AIC
cycles
Sample time
t
ADS
5— —
t
AIC
cycles
Monotonicity
M
AD
Guaranteed
Zero input reading
Z
ADI
000 — 003 Hex
V
ADIN
= V
SSAD
Full-scale reading
F
ADI
3FC — 3FF Hex
V
ADIN
= V
DDAD
Input capacitance
C
ADI
— — 30 pF Not tested
V
REFH
/V
REFL
current I
VREF
—1.6 — mA
Absolute accuracy
(8-bit truncation mode)
A
AD
—— ± 1 LSB Includes quantization
Quantization error
(8-bit truncation mode)
———
+ 7/8
– 1/8
LSB