
2009 Microchip Technology Inc.
DS39887C-page 35
PIC18F2458/2553/4458/4553
TABLE 4-1:
A/D CONVERTER CHARACTERISTICS: PIC18F2458/2553/4458/4553 (INDUSTRIAL)
PIC18LF2458/2553/4458/4553 (INDUSTRIAL)
Param
No.
Sym
Characteristic
Min
Typ
Max
Units
Conditions
A01
NR
Resolution
—
12
bit
ΔVREF ≥ 3.0V
A03
EIL
Integral Linearity Error
—
±1
±2.0
LSB
VDD = 3.0V
ΔVREF ≥ 3.0V
——
±2.0
LSB
VDD = 5.0V
A04
EDL
Differential Linearity Error
—
±1
+1.5/-1.0
LSB
VDD = 3.0V
ΔVREF ≥ 3.0V
——
+1.5/-1.0
LSB
VDD = 5.0V
A06
EOFF
Offset Error
—
±1
±5
LSB
VDD = 3.0V
ΔVREF ≥ 3.0V
——
±3
LSB
VDD = 5.0V
A07
EGN
Gain Error
—
±1
±1.25
LSB
VDD = 3.0V
ΔVREF ≥ 3.0V
——
±2.00
LSB
VDD = 5.0V
A10
—
Monotonicity
Guaranteed(1)
—VSS
≤ VAIN ≤ VREF
A20
ΔVREF Reference Voltage Range
(VREFH – VREFL)
3—
VDD – VSS
V
For 12-bit resolution
A21
VREFH Reference Voltage High
VSS + 3.0V
—
VDD + 0.3V
V
For 12-bit resolution
A22
VREFL Reference Voltage Low
VSS – 0.3V
—
VDD – 3.0V
V
For 12-bit resolution
A25
VAIN
Analog Input Voltage
VREFL
—VREFH
V
A30
ZAIN
Recommended
Impedance of Analog
Voltage Source
——
2.5
k
Ω
A50
IREF
VREF Input Current(2)
—
5
150
μA
During VAIN acquisition.
During A/D conversion
cycle.
Note 1:
The A/D conversion result never decreases with an increase in the input voltage and has no missing codes.
2:
VREFH current is from the RA3/AN3/VREF+ pin or VDD, whichever is selected as the VREFH source.
VREFL current is from the RA2/AN2/VREF-/CVREF pin or VSS, whichever is selected as the VREFL source.