Datasheet

© 2009 Microchip Technology Inc. DS39636D-page 349
PIC18F2X1X/4X1X
TABLE 25-24: A/D CONVERTER CHARACTERISTICS: PIC18F2X1X/4X1X (INDUSTRIAL)
PIC18LF2X1X/4X1X (INDUSTRIAL)
Param
No.
Symbol Characteristic Min Typ Max Units Conditions
A01 N
R Resolution — — 10 bit ΔVREF ≥ 3.0V
A03 EIL Integral Linearity Error — — <±1 LSb ΔVREF ≥ 3.0V
A04 E
DL Differential Linearity Error — — <±1 LSb ΔVREF ≥ 3.0V
A06 EOFF Offset Error — — <±1 LSb ΔVREF ≥ 3.0V
A07 EGN Gain Error — — <±1 LSb ΔVREF ≥ 3.0V
A10 — Monotonicity Guaranteed
(1)
—VSS ≤ VAIN ≤ VREF
A20 ΔVREF Reference Voltage Range
(V
REFH – VREFL)
1.8
3
—
—
—
—
V
V
V
DD < 3.0V
V
DD ≥ 3.0V
A21 V
REFH Reference Voltage High VSS —VREFH V
A22 VREFL Reference Voltage Low VSS – 0.3V — VDD – 3.0V V
A25 VAIN Analog Input Voltage VREFL —VREFH V
A30 Z
AIN Recommended Impedance of
Analog Voltage Source
——2.5kΩ
A50 I
REF VREF Input Current
(2)
—
—
—
—
5
150
μA
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 RA3/AN3/VREF+ pin or VDD, whichever is selected as the VREFH source.
V
REFL current is from RA2/AN2/VREF-/CVREF pin or VSS, whichever is selected as the VREFL source.