MC68HC08AS20 Datasheet, PDF (370/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

21.7 ADC Characteristics
Characteristic
Min
Max
Unit
Comments
Resolution
8
8
Bits
Absolute Accuracy
(V_REFL = 0 V, V_DDA = V_REFH = 5 V ± 10%)
Conversion Range (see Note 1)
Power-Up Time
–1
V_REFL
16
+1
V_REFH
17
LSB
V
µs
Includes
Quantization
V_REFL = V_SSA
Conversion Time
Period
Input Leakage (see Note 3)
Ports B and D
—
±1
µA
Conversion Time
16
17
ADC
Clock
Cycles
Includes Sampling
Time
Monotonicity
Inherent within Total Error
Zero Input Reading
Full-Scale Reading
Sample Time (see Note 2)
00
01
Hex
V_IN = V_REFL
FE
FF
Hex
V_IN = V_REFH
ADC
5
—
Clock
Cycles
Input Capacitance
—
8
pF
Not Tested
ADC Internal Clock
500 k 1.048 M
Hz
Tested Only at 1 MHz
Analog Input Voltage
–0.3
V_DD + 0.3
V
NOTES:
1. V_DD = 5.0 Vdc ± 10%, V_SS = 0 Vdc, V_DDA/V_DDAREF = 5.0 Vdc ± 10%, V_SSA = 0 Vdc, V_REFH = 5.0 Vdc ± 10%
2. Source impedances greater than 10 kΩ adversely affect internal RC charging time during input sampling.
3. The external system error caused by input leakage current is approximately equal to the product of R
source and input current.
Advance Information
370
MC68HC08AS20 —Rev. 4.1
Freescale Semiconductor