Datasheet

PIC18F87K22 FAMILY
DS39960B-page 520 Preliminary  2010 Microchip Technology Inc.
TABLE 31-26: A/D CONVERTER CHARACTERISTICS: PIC18F87K22 FAMILY (INDUSTRIAL)
Param
No.
Sym Characteristic Min Typ Max Units Conditions
A01 NR Resolution — — 12 bit VREF  3.0V
A03 E
IL Integral Linearity Error — <±1 ±2.0 LSB VDD = 3.0V (VREF 3.0V)
——±2.0LSBV
DD = 5.0V
A04 E
DL Differential Linearity Error — <±1 +1.5/-1.0 LSB VDD = 3.0V (VREF 3.0V)
——+1.5/-1.0LSBV
DD = 5.0V
A06 E
OFF Offset Error — <±1 ±5 LSB VDD = 3.0V (VREF 3.0V)
——±3LSBV
DD = 5.0V
A07 E
GN Gain Error — <±1 ±1.25 LSB VDD = 3.0V (VREF 3.0V)
——±2.00LSBV
DD = 5.0V
A10 — Monotonicity Guaranteed
(1)
—VSS  VAIN  VREF
A20 VREF Reference Voltage Range
(V
REFH – VREFL)
3—V
DD – VSS V For 12-bit resolution
A21 VREFH Reference Voltage High VSS + 3.0V — VSS + 3.0V V For 12-bit resolution
A22 V
REFL Reference Voltage Low VSS – 0.3V — VSS – 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
——2.5k
A50 IREF VREF Input Current
(2)
—
—
—
—
5
150
A
A
During V
AIN 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/V
REF-/CVREF pin or VSS, whichever is selected as the VREFL source.