MC68HC11F1_13 Datasheet, PDF (145/158 Pages) Freescale Semiconductor, Inc – Technical Data

Freescale Semiconductor, Inc.
Table A-6 Analog-To-Digital Converter Characteristics
V_DD = 5.0 Vdc ± 5%, V_SS = 0 Vdc, T_A = T_L to T_H, 750 kHz ≤ E ≤ 3.0 MHz, unless otherwise noted
Characteristic
Parameter
Min
Absolute 2.0 MHz 3.0 MHz 4.0 MHz Unit
Max Max Max
Resolution
Number of Bits Resolved by A/D Converter
—
Non-Linearity Maximum Deviation from the Ideal A/D Transfer —
Characteristics
Zero Error
Difference Between the Output of an Ideal and
—
an Actual for Zero Input Voltage
Full Scale Error Difference Between the Output of an Ideal and
—
an Actual A/D for Full-Scale Input Voltage
Total Unadjusted Maximum Sum of Non-Linearity, Zero Error, and —
Error
Full-Scale Error
Quantization Uncertainty Because of Converter Resolution
—
Error
Absolute
Accuracy
Difference Between the Actual Input Voltage and —
the Full-Scale Weighted Equivalent of the Binary
Output Code, All Error Sources Included
8
—
—
— Bits
—
±1
±1
± 1 LSB
—
±1
±1
± 1 LSB
—
±1
±1
± 1 LSB
—
± 1/2 ± 1 1/2 ± 1 1/2 LSB
—
± 1/2 ± 1/2 ± 1/2 LSB
—
±1
±2
± 2 LSB
Conversion
Range
V_RH
V_RL
∆V_R
Conversion
Time
Monotonicity
Analog Input Voltage Range
V_RL
—
V_RH
V_RH
V_RH
V
Maximum Analog Reference Voltage
(Note 2)
V_RL
—
V_DD + V_DD + V_DD + V
0.1
0.1
0.1
Minimum Analog Reference Voltage
(Note 2)
V_SS –0.1
—
V_RH
V_RH
V_RH
V
Minimum Difference between V_RH and V_RL
3
—
—
—
—
V
(Note 2)
Total Time to Perform a Single
Analog-to-Digital Conversion:
E Clock —
Internal RC Oscillator —
32
—
—
—
t_cyc
—
t_cyc + 32 t_cyc + 32 t_cyc + 32 µs
Conversion Result Never Decreases with an
Guaranteed
Increase in Input Voltage and has no Missing
Codes
Zero Input
Reading
Conversion Result when V_in = V_RL
00
—
—
—
— Hex
Full Scale
Reading
Conversion Result when V_in = V_RH
—
—
FF
FF
FF Hex
Sample
Analog Input Acquisition Sampling Time:
Acquisition Time
E Clock —
Internal RC Oscillator —
Sample/Hold Input Capacitance during Sample PE[7:0]
—
Capacitance
12
—
—
—
t_cyc
—
12
12
12 µs
20 (Typ)
—
—
— pF
Input Leakage Input Leakage on A/D Pins
PE[7:0] —
V_RL, V_RH
—
—
400 400 400 nA
—
1.0
1.0
1.0 µA
NOTES:
1. For f_op < 2 MHz, source impedances should equal approximately 10 kΩ. For f_op ≥ 2 MHz, source impedances
should equal approximately 5 kΩ – 10 kΩ. Source impedances greater than 10 kΩ affect accuracy adversely be-
cause of input leakage.
2. Performance verified down to 2.5 V ∆V_R, but accuracy is tested and guaranteed at ∆V_R = 5 V ± 10%
TECHNICAL DATA
ELECTRICAL CHARACTERISTICS
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A-11