Datasheet

PIC18FXX8
DS41159E-page 358 © 2006 Microchip Technology Inc.
TABLE 27-23: A/D CONVERTER CHARACTERISTICS: PIC18FXX8 (INDUSTRIAL, EXTENDED)
PIC18LFXX8 (INDUSTRIAL)
Param
No.
Symbol Characteristic Min Typ Max Units Conditions
A01 N
R Resolution — — 10 bit VREF = VDD ≥ 3.0V
A03 EIL Integral Linearity Error — — <±1 LSb VREF = VDD ≥ 3.0V
A04 E
DL Differential Linearity Error — — <±1 LSb VREF = VDD ≥ 3.0V
A05 EFS Full Scale Error — — <±1 LSb VREF = VDD ≥ 3.0V
A06 EOFF Offset Error — — <±1.5 LSb VREF = VDD ≥ 3.0V
A10 — Monotonicity
(3)
guaranteed — VSS ≤ VAIN ≤ VREF
A20 VREF Reference Voltage
(V
REFH – VREFL)
0V — — V
A20A 3V — — V For 10-bit resolution
A21 VREFH Reference Voltage High VSS —VDD + 0.3V V
A22 VREFL Reference Voltage Low VSS – 0.3V — VDD V
A25 VAIN Analog Input Voltage VSS – 0.3V — VREF + 0.3V V
A30 Z
AIN Recommended Impedance of
Analog Voltage Source
— — 10.0 kΩ
A40 I
AD A/D Conversion
Current (V
DD)
PIC18FXX8 — 180 — μA Average current
consumption when
A/D is on (Note 1)
PIC18LFXX8 — 90 — μA
A50 I
REF VREF Input Current (Note 2) 0
—
—
—
5
150
μA
μA
During VAIN acquisition.
Based on differential of
VHOLD to VAIN. To
charge C
HOLD.
During A/D conversion
cycle.
Note 1: When A/D is off, it will not consume any current other than minor leakage current. The power-down current
specification includes any such leakage from the A/D module.
VREF current is from RA2/AN2/VREF- and RA3/AN3/VREF+ pins or VDD and VSS pins, whichever is selected
as reference input.
2: V
SS ≤ VAIN ≤ VREF
3: The A/D conversion result never decreases with an increase in the input voltage and has no missing
codes.