Datasheet

© 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 N
R Resolution — — 12 bit ΔVREF ≥ 3.0V
A03 E
IL Integral Linearity Error — ±1 ±2.0 LSB VDD = 3.0V ΔVREF ≥ 3.0V
——±2.0LSBV
DD = 5.0V
A04 E
DL Differential Linearity Error — ±1 +1.5/-1.0 LSB VDD = 3.0V ΔVREF ≥ 3.0V
——+1.5/-1.0LSBV
DD = 5.0V
A06 E
OFF Offset Error — ±1 ±5 LSB VDD = 3.0V ΔVREF ≥ 3.0V
——±3LSBV
DD = 5.0V
A07 E
GN Gain Error — ±1 ±1.25 LSB VDD = 3.0V ΔVREF ≥ 3.0V
——±2.00LSBV
DD = 5.0V
A10 — Monotonicity Guaranteed
(1)
—VSS ≤ VAIN ≤ VREF
A20 ΔVREF Reference Voltage Range
(V
REFH – VREFL)
3—V
DD – VSS V For 12-bit resolution
A21 V
REFH Reference Voltage High VSS + 3.0V — VDD + 0.3V V For 12-bit resolution
A22 V
REFL Reference Voltage Low VSS – 0.3V — VDD – 3.0V V For 12-bit resolution
A25 V
AIN 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: V
REFH current is from the RA3/AN3/VREF+ pin or VDD, whichever is selected as the VREFH source.
V
REFL current is from the RA2/AN2/VREF-/CVREF pin or VSS, whichever is selected as the VREFL source.