Datasheet

PIC16F872
DS30221C-page 136 © 2006 Microchip Technology Inc.
TABLE 14-9: A/D CONVERTER CHARACTERISTICS:
PIC16F872 (COMMERCIAL, INDUSTRIAL, EXTENDED)
PIC16LF872 (COMMERCIAL, INDUSTRIAL)
Param
No.
Sym Characteristic Min Typ† Max Units Conditions
A01 N
R Resolution — — 10-bits bit VREF = VDD = 5.12V,
V
SS ≤ VAIN ≤ VREF
A03 EIL Integral Linearity Error — — < ± 1 LSb VREF = VDD = 5.12V,
V
SS ≤ VAIN ≤ VREF
A04 EDL Differential Linearity Error — — < ± 1 LSb VREF = VDD = 5.12V,
V
SS ≤ VAIN ≤ VREF
A06 EOFF Offset Error — — < ± 2 LSb VREF = VDD = 5.12V,
V
SS ≤ VAIN ≤ VREF
A07 EGN Gain Error — — < ± 1 LSb VREF = VDD = 5.12V,
V
SS ≤ VAIN ≤ VREF
A10 — Monotonicity — guaranteed
(3)
——VSS ≤ VAIN ≤ VREF
A20 VREF Reference Voltage (VREF+ - VREF-) 2.0 — VDD + 0.3 V Absolute minimum electrical
spec. to ensure 10-bit
accuracy.
A21 V
REF+ Reference Voltage High AVDD - 2.5V AVDD + 0.3V V
A22 V
REF- Reference Voltage Low AVSS - 0.3V VREF+ - 2.0V V
A25 V
AIN 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)
Standard — 220 — μA Average current consumption
when A/D is on (Note 1).
Extended — 90 — μA
A50 I
REF VREF Input Current (Note 2) 10
—
—
—
1000
10
μA
μA
During VAIN acquisition,
based on differential of V
HOLD
to V
AIN to charge CHOLD, see
Section 10.1.
During A/D conversion cycle.
* These parameters are characterized but not tested.
† Data in "Typ" column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
Note 1: 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.
2: V
REF current is from RA3 pin or VDD pin, whichever is selected as reference input.
3: The A/D conversion result never decreases with an increase in the input voltage, and has no missing codes.