Datasheet

PIC16F818/819
DS39598C-page 140 Preliminary  2002 Microchip Technology Inc.
TABLE 15-9: A/D CONVERTER CHARACTERISTICS: PIC16F818/819 (INDUSTRIAL, EXTENDED)
PIC16LF818/819 (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
(3)
— guaranteed — — VSS ≤ VAIN ≤ VREF
A20 VREF Reference Voltage 2.5
2.2
—
—
VDD + 0.3
V
DD + 0.3
V
V
-40°C to +85°C
0°C to +85°C
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 See Note 4.
A50 I
REF VREF input current (Note 2) —
—
—
—
5
500
µA
µA
During VAIN acquisition.
Based on differential of
V
HOLD to VAIN to charge
C
HOLD, see Section 11.1.
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.
4: The maximum allowed impedance for analog voltage source is 10 kΩ. This requires higher acquisition times.