PIC18F2331/2431/4331/4431
TABLE 26-20: A/D CONVERTER CHARACTERISTICS
PIC18LF2331/2431/4331/4431
Standard Operating Conditions (unless otherwise stated)
Operating temperature -40°C TA +85°C for industrial
(Industrial)
Standard Operating Conditions (unless otherwise stated)
PIC18F2331/2431/4331/4431
Operating temperature
-40°C TA +85°C for industrial
-40°C TA +125°C for extended
(Industrial)
Param
Symbol
No.
Characteristic
Min
Typ
Max
Units
Conditions
Device Supply
AVDD
AVSS
IAD
Analog VDD Supply
Analog VSS Supply
VDD – 0.3
VSS – 0.3
—
—
VDD + 0.3
VSS + 0.3
V
V
Module Current
(during conversion)
—
—
500
250
—
—
A
VDD = 5V
A VDD = 2.5V
IADO
Module Current Off
—
—
1.0
A
AC Timing Parameters
A10
A11
A12
FTHR
Throughput Rate
—
—
—
—
200
75
ksps VDD = 5V, single channel
ksps VDD < 3V, single channel
TAD
A/D Clock Period
385
1000
—
—
20,000
20,000
ns
ns
VDD = 5V
VDD = 3V
TRC
A/D Internal RC Oscillator Period
—
—
—
500
750
10000
1500
2250
20000
ns
ns
ns
PIC18F parts
PIC18LF parts
AVDD < 3.0V
(1)
A13
A14
A16
TCNV
TACQ
TTC
Conversion Time
12
12
—
—
12
—
—
TAD
TAD
(2)
(2)
Acquisition Time
2
Conversion Start from External
1/4 TCY
Reference Inputs
A20
VREF
Reference Voltage for 10-Bit
Resolution (VREF+ – VREF-)
1.5
1.8
—
—
AVDD – AVSS
AVDD – AVSS
V
V
VDD 3V
VDD < 3V
A21
A22
A23
VREFH
VREFL
IREF
Reference Voltage High (AVDD or VREF+)
Reference Voltage Low (AVSS or VREF-)
Reference Current
1.5V
—
—
AVDD
V
V
VDD 3V
AVSS
VREFH – 1.5V
—
—
150 A
75 A
—
—
VDD = 5V
VDD = 2.5V
Analog Input Characteristics
(3)
A26
A30
VAIN
ZAIN
Input Voltage
AVSS – 0.3
—
—
—
AVDD + 0.3
2.5
V
Recommended Impedance of Analog
Voltage Source
k
A31
ZCHIN
Analog Channel Input Impedance
—
—
10.0
k VDD = 3.0V
DC Performance
A41
A42
NR
Resolution
10 bits
—
—
EIL
Integral Nonlinearity
—
—
—
—
<1
<1
LSb VDD 3.0V
VREFH 3.0V
A43
A45
A46
A47
EIL
Differential Nonlinearity
Offset Error
—
0.5
LSb VDD 3.0V
VREFH 3.0V
EOFF
EGA
—
<1.5
<1.5
LSb VDD 3.0V
VREFH 3.0V
Gain Error
0.5
LSb VDD 3.0V
VREFH 3.0V
(4)
Monotonicity
guaranteed
—
VDD 3.0V
VREFH 3.0V
Note 1: Conversion time does not include acquisition time. See Section 21.0 “10-Bit High-Speed Analog-to-Digital Converter
(A/D) Module” for a full discussion of acquisition time requirements.
2: In Sequential modes, TACQ should be 12 TAD or greater.
3: For VDD < 2.7V and temperature below 0°C, VAIN should be limited to range < VDD/2.
4: The A/D conversion result never decreases with an increase in the input voltage and has no missing codes.
2010 Microchip Technology Inc.
DS39616D-page 361
MICROCHIP [ MICROCHIP ]
