Freescale Semiconductor, Inc.
Table A-6 Analog-To-Digital Converter Characteristics
VDD = 5.0 Vdc ± 5%, VSS = 0 Vdc, TA = TL to TH, 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
—
—
8
Bits
Non-Linearity
Maximum Deviation from the Ideal A/D Transfer
Characteristics
—
± 1
± 1
± 1
LSB
Zero Error
Difference Between the Output of an Ideal and
an Actual for Zero Input Voltage
—
—
—
—
—
—
—
—
—
—
± 1
± 1
± 1
± 1
± 1
± 1
LSB
LSB
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
± 1/2 ± 1 1/2 ± 1 1/2 LSB
Full-Scale Error
Quantization
Error
Uncertainty Because of Converter Resolution
± 1/2
± 1
± 1/2
± 2
± 1/2
± 2
LSB
LSB
Absolute
Accuracy
Difference Between the Actual Input Voltage and
the Full-Scale Weighted Equivalent of the Binary
Output Code, All Error Sources Included
Conversion
Range
Analog Input Voltage Range
V
V
—
—
—
—
V
V
V
RH
V
V
V
V
RL
RH
RH
V
Maximum Analog Reference Voltage
(Note 2)
V
0.1
+
V
0.1
+
V
0.1
+
RH
RL
DD
DD
DD
V
Minimum Analog Reference Voltage
(Note 2)
V
–0.1
V
V
V
RH
RL
SS
RH
RH
∆V
Minimum Difference between V and V
RL
(Note 2)
3
—
—
—
R
RH
Conversion
Time
Total Time to Perform a Single
Analog-to-Digital Conversion:
E Clock
—
—
32
—
—
—
—
t
cyc
Internal RC Oscillator
t
+ 32 t + 32 t + 32 µs
cyc cyc cyc
Monotonicity
Conversion Result Never Decreases with an
Increase in Input Voltage and has no Missing
Codes
Guaranteed
Zero Input
Reading
Conversion Result when V = V
00
—
—
—
—
—
—
Hex
Hex
in
RL
Full Scale
Reading
Conversion Result when V = V
FF
FF
FF
in
RH
Sample
Acquisition Time
Analog Input Acquisition Sampling Time:
E Clock
Internal RC Oscillator
—
—
12
—
—
12
—
12
—
12
t
cyc
µs
Sample/Hold
Capacitance
Input Capacitance during Sample PE[7:0]
—
20 (Typ)
—
—
—
pF
Input Leakage
Input Leakage on A/D Pins
PE[7:0]
, V
—
—
—
—
400
1.0
400
1.0
400
1.0
nA
µA
V
RL
RH
NOTES:
1. For f < 2 MHz, source impedances should equal approximately 10 kΩ. For f ≥ 2 MHz, source impedances
op
op
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 , but accuracy is tested and guaranteed at ∆V = 5 V ± 10%
R
R
ELECTRICAL CHARACTERISTICS
TECHNICAL DATA
A-11
For More Information On This Product,
Go to: www.freescale.com
FREESCALE [ Freescale ]
