Datasheet

© 2009 Microchip Technology Inc. DS39761C-page 453
PIC18F2682/2685/4682/4685
TABLE 27-24: A/D CONVERTER CHARACTERISTICS: PIC18F2682/2685/4682/4685 (INDUSTRIAL)
PIC18LF2682/2685/4682/4685 (INDUSTRIAL)
Param
No.
Sym 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)
—
A20 ΔVREF Reference Voltage Range
(V
REFH – VREFL)
3—AV
DD – AVSS V For 10-bit resolution
A21 V
REFH Reference Voltage High AVSS + 3.0V — AVDD + 0.3V V For 10-bit resolution
A22 VREFL Reference Voltage Low AVSS – 0.3V — AVDD – 3.0V V For 10-bit resolution
A25 VAIN Analog Input Voltage VREFL —VREFH V
A28 AV
DD Analog Supply Voltage VDD – 0.3 — VDD + 0.3 V
A29 AVSS Analog Supply Voltage VSS – 0.3 — VSS + 0.3 V
A30 ZAIN Recommended Impedance of
Analog Voltage Source
——2.5kΩ
A40 I
AD A/D Conversion
Current (V
DD)
PIC18FXXXX — 180 — μA Average current
consumption when
A/D is on (Note 2)
PIC18LFXXXX — 90 — μAV
DD = 2.0V;
average current
consumption when
A/D is on (Note 2)
A50 I
REF VREF Input Current (Note 3) —
—
—
—
±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: 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.
3: V
REFH current is from RA3/AN3/VREF+ pin or AVDD, whichever is selected as the VREFH source.
V
REFL current is from RA2/AN2/VREF- pin or AVSS, whichever is selected as the VREFL source.