PIC18F2220/2320/4220/4320
TABLE 26-24: A/D CONVERTER CHARACTERISTICS: PIC18F2220/2320/4220/4320 (INDUSTRIAL)
PIC18F2220/2320/4220/4320 (EXTENDED)
PIC18LF2220/2320/4220/4320 (INDUSTRIAL)
Param
No.
Symbol
Characteristic
Resolution
Min
Typ
Max
Units
Conditions
A01
NR
—
—
—
—
—
—
—
—
—
—
10
bit ∆VREF ≥ 3.0V
A03
A04
A06
A07
EIL
Integral Linearity Error
Differential Linearity Error
Offset Error
<±1
<±1
<±1
<±1
LSb ∆VREF ≥ 3.0V
LSb ∆VREF ≥ 3.0V
LSb ∆VREF ≥ 3.0V
LSb ∆VREF ≥ 3.0V
EDL
EOFF
EGN
Gain Error
A10
A20
—
Monotonicity
guaranteed(2)
—
∆VREF Reference Voltage Range
3
—
AVDD – AVSS
V
For 10-bit resolution
(VREFH – VREFL)
A21
A22
A25
A28
A29
A30
VREFH Reference Voltage High
VREFL Reference Voltage Low
AVSS + 3.0V
AVSS – 0.3V
VREFL
—
—
—
—
—
—
AVDD + 0.3V
AVDD – 3.0V
VREFH
V
V
For 10-bit resolution
For 10-bit resolution
VAIN
Analog Input Voltage
Analog Supply Voltage
Analog Supply Voltage
V
AVDD
AVSS
ZAIN
VDD – 0.3
VSS – 0.3
—
VDD + 0.3
VSS + 0.3
2.5(4)
V
Tie to VDD
Tie to VSS
V
Recommended Impedance of
Analog Voltage Source
kΩ
A40
A50
IAD
A/D Current
from VDD
PIC18FXX20
—
—
—
—
180(5)
90(5)
µA Average current during
conversion(1)
PIC18LFXX20
µA
IREF
VREF Input Current (3)
—
—
—
—
±5(5)
µA During VAIN acquisition.
µA During A/D conversion
cycle.
±150(5)
Note 1: When A/D is off, it will not consume any current other than minor leakage current. The power-down current
spec includes any such leakage from the A/D module.
2: The A/D conversion result never decreases with an increase in the input voltage and has no missing
codes.
3: VREFH current is from RA3/AN3/VREF+ pin or AVDD, whichever is selected as the VREFH source.
VREFL current is from RA2/AN2/VREF- pin or AVSS, whichever is selected as the VREFL source.
4: Assume quiet environment. If adjacent pins have high-frequency signals (analog or digital), ZAIN may need
to be reduced to as low as 1 kΩ to fight crosstalk effects.
5: For guidance only.
2003 Microchip Technology Inc.
DS39599C-page 341
MICROCHIP [ MICROCHIP ]
