Datasheet

Electrical Specifications
MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 4
296 Freescale Semiconductor
21.11 3.3-Volt ADC Characteristics
Characteristic
(1)
1. V
DD
= 3.3 Vdc ± 10%, V
SS
= 0 Vdc, V
DDAD/VREFH
= 3.3 Vdc ± 10%, V
SSAD/
V
REFL
= 0 Vdc
Symbol Min Max Unit Comments
Supply voltage
V
DDAD
3.0 3.6 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
–6 +6 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
000 005 Hex
V
ADIN
= V
SSA
Full-scale reading
F
ADI
3FA 3FF Hex
V
ADIN
= V
DDA
Input capacitance
C
ADI
— 30 pF Not tested
V
DDAD
/V
REFH
current I
VREF
—1.2mA
Absolute accuracy
(8-bit truncation mode)
A
AD
–1 +1 LSB Includes quantization
Quantization error
(8-bit truncation mode)
— –1/8 +7/8 LSB