Datasheet

 2011 Microchip Technology Inc. DS39960D-page 523
PIC18F87K22 FAMILY
TABLE 31-27: A/D CONVERTER CHARACTERISTICS: PIC18F87K22 FAMILY (INDUSTRIAL)
Param
No.
Sym Characteristic Min Typ Max Units Conditions
A01 NR Resolution — — 12 bit VREF  5.0V
A03 E
IL Integral Linearity Error — ±1 ±6.0 LSB VREF = 5.0V
A04 E
DL Differential Linearity Error — ±1 +3.0/-1.0 LSB VREF = 5.0V
A06 E
OFF Offset Error — ±1 ±9.0 LSB VREF = 5.0V
A07 E
GN Gain Error — ±1 ±8.0 LSB VREF = 5.0V
A10 — Monotonicity
(1)
— ———VSS  VAIN  VREF
A20 VREF Reference Voltage Range
(V
REFH – VREFL)
3—V
DD – VSS V
A21 V
REFH Reference Voltage High VSS + 3.0V — VDD + 0.3V V
A22 V
REFL Reference Voltage Low VSS – 0.3V — VDD – 3.0V V
A25 V
AIN Analog Input Voltage VREFL —VREFH V
A30 ZAIN 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 doesn’t decrease with an increase in the input voltage.
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- pin or VSS, whichever is selected as the VREFL source.