MC68HLC908QY4 Datasheet, PDF (159/182 Pages) Motorola, Inc – Microcontrollers

Analog-to-Digital (ADC) Converter Characteristics
16.10 Analog-to-Digital (ADC) Converter Characteristics
16.10.1 ADC Electrical Operating Conditions
The ADC accuracy characteristics below are guaranteed over two operating conditions as stated here.
Condition A
Condition B
Characteristic
ATD supply
ADC internal clock
Ambient temperature
ATD supply
ADC internal clock
Ambient temperature
Symbol
V_DD
f_ADIC
T_A
V_DD
f_ADIC
T_A
Min
2.7
0.008
T_L
2.3
8
0
Max
3.6
1
T_H
2.7
63
T_H
Unit
V
MHz
°C
V
kHz
°C
16.10.2 ADC Performance Characteristics
Characteristic
Symbol Min Max
Unit
Comments
Input voltages
V_ADIN
V_SS
V_DD
V
—
Resolution (1 LSB)
Condition A
Condition B
RES
10.5 14.1
8.99 10.5
mV
—
Absolute accuracy
(Total unadjusted error)
Condition A
Condition B
E_TUE
—
± 1.5
—
± 2.0
LSB
Includes quantization
Conversion range
V_AIN
V_SS
V_DD
V
—
Power-up time
t_ADPU
16
—
t_ADIC cycles
t_ADIC = 1/f_ADIC
Conversion time
t_ADC
16
17
t_ADIC cycles
t_ADIC = 1/f_ADIC
Sample time⁽¹⁾
t_ADS
5
—
t_ADIC cycles
t_ADIC = 1/f_ADIC
Zero input reading⁽²⁾
Z_ADI
00
01
Hex
V_IN = V_SS
Full-scale reading⁽³⁾
F_ADI
FE
FF
Hex
V_IN = V_DD
Input capacitance
C_ADI
—
8
pF
Not tested
Input leakage⁽³⁾
I_IL
—
±1
µA
—
ADC supply current (V_DD = 3 V)
I_ADAD
Typical = 0.45
mA
Enabled
1. Source impedances greater than 10 kΩ adversely affect internal RC charging time during input sampling.
2. Zero-input/full-scale reading requires sufficient decoupling measures for accurate conversions.
3. The external system error caused by input leakage current is approximately equal to the product of R source and input
current.
MC68HLC908QY/QT Family Data Sheet, Rev. 3
Freescale Semiconductor
159