MC68HC11E0CFNE3 Datasheet, PDF (167/242 Pages) Freescale Semiconductor, Inc – M68HC11E Family

MC68L11E9/E20 Analog-to-Digital Converter Characteristics
10.14 MC68L11E9/E20 Analog-to-Digital Converter Characteristics
Characteristic⁽¹⁾
Parameter⁽²⁾
Min
Absolute
Max
Unit
Resolution
Number of bits resolved by A/D converter
—
8
—
Bits
Non-linearity
Maximum deviation from the ideal A/D transfer
characteristics
—
—
±1
LSB
Zero error
Difference between the output of an ideal and an
actual for 0 input voltage
—
—
±1
LSB
Full scale error
Difference between the output of an ideal and an
actual A/D for full-scale input voltage
—
—
±1
LSB
Total unadjusted
error
Maximum sum of non-linearity, zero error, and
full-scale error
—
—
±1/2
LSB
Quantization error Uncertainty because of converter resolution
—
—
±1/2
LSB
Difference between the actual input voltage and
Absolute accuracy
the full-scale weighted equivalent of the binary
—
—
±2
LSB
output code, all error sources included
Conversion range
V_RH
Analog input voltage range
Maximum analog reference voltage
V_RL
—
V_RH
V
V_RL
—
V_DD + 0.1
V
V_RL
Minimum analog reference voltage
V_SS –0.1
—
V_RH
V
∆V_R
Minimum difference between V_RH and V_RL
3.0
—
—
V
Conversion time
Monotonicity
Total time to perform a single
analog-to-digital conversion:
E clock
Internal RC oscillator
Conversion result never decreases with an
increase in input voltage and has no missing
codes
—
32
—
t_CYC
—
—
t_CYC+ 32
µs
—
Guaranteed
—
—
Zero input reading
Full scale reading
Conversion result when V_In = V_RL
Conversion result when V_In = V_RH
00
—
—
Hex
—
—
FF
Hex
Sample acquisition
time
Analog input acquisition sampling time:
E clock
Internal RC oscillator
—
12
—
t_CYC
—
—
12
µs
Sample/hold
capacitance
Input capacitance during sample
PE[7:0]
—
20 typical
—
pF
Input leakage
Input leakage on A/D pins
PE[7:0]
V_RL, V_RH
—
—
400
nA
—
—
1.0
µA
1. V_DD = 3.0 Vdc to 5.5 Vdc, V_SS = 0 Vdc, T_A = T_L to T_H, 750 kHz ≤ E ≤ 2.0 MHz, unless otherwise noted
2. Source impedances greater than 10 kΩ affect accuracy adversely because of input leakage.
M68HC11E Family Data Sheet, Rev. 5.1
Freescale Semiconductor
167