Datasheet

PIC16F87XA
DS39582B-page 194  2003 Microchip Technology Inc.
TABLE 17-14: A/D CONVERTER CHARACTERISTICS:PIC16F873A/874A/876A/877A (INDUSTRIAL)
PIC16LF873A/874A/876A/877A (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
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
——2.5kΩ (Note 4)
A40 I
AD A/D Conversion
Current (V
DD)
PIC16F87XA — 220 — µA Average current
consumption when A/D is
on (Note 1)
PIC16LF87XA — 90 — µA
A50 I
REF VREF Input Current (Note 2) —
—
—
—
5
150
µA
µA
During VAIN acquisition.
Based on differential of
V
HOLD to VAIN to charge
C
HOLD, see Section 11.1
“A/D Acquisition
Requirements”.
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.
4: Maximum allowed impedance for analog voltage source is 10 kΩ. This requires higher acquisition time.