MC68HC908LJ12 Datasheet, PDF (399/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Electrical Specifications
23.13 3.3V ADC Electrical Characteristics
Table 23-11. ADC 3.3V Electrical Characteristics
Characteristic
Supply voltage
Input range
Resolution
Absolute accuracy
ADC internal clock
Conversion range
ADC voltage
reference high
Symbol
V_DDA
V_ADIN
B_AD
A_AD
f_ADIC
R_AD
V_REFH
Min
3.0
0
10
—
32 k
V_REFL
—
Max
3.6
V_DDA
10
± 1.5
2M
V_REFH
V_DDA + 0.1
Unit
V
V
bits
LSB
Hz
V
Notes
V_DDA is an dedicated pin and
should be tied to V_DD on the
PCB with proper decoupling.
V_ADIN ≤ V_DDA
Includes quantization.
±0.5 LSB = ±1 ADC count.
t_ADIC = 1/f_ADIC
V
ADC voltage
reference low
V_REFL
V_SSA – 0.1
—
V
V_SSA is tied to V_SS internally.
Conversion time
Sample time
Monotonically
Zero input reading
Full-scale reading
Input capacitance
Input impedance
V_REFH/V_REFL
t_ADC
t_ADS
M_AD
Z_ADI
F_ADI
C_ADI
R_ADI
I_VREF
16
17
5
—
000
3FC
—
20 M
—
Guaranteed
001
3FF
20
—
1.6
t_ADIC
cycles
t_ADIC
cycles
HEX
HEX
pF
Ω
mA
V_ADIN = V_REFL
V_ADIN = V_REFH
Not tested.
Measured at 5V
Not tested.
Technical Data
400
Electrical Specifications
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor