Datasheet

PIC16F87/88
DS30487D-page 188  2002-2013 Microchip Technology Inc.
TABLE 18-13: A/D CONVERTER CHARACTERISTICS: PIC16F87/88 (INDUSTRIAL, EXTENDED)
PIC16LF87/88 (INDUSTRIAL)
Param
No.
Sym Characteristic Min Typ† Max Units Conditions
A01 N
R Resolution — — 10-bit 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
(V
REF+ – VREF-)
2.0 — V
DD + 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
——2.5k (Note 4)
A40 I
AD A/D Conversion
Current (V
DD)
PIC16F87/88 — 220 — A Average current
consumption when A/D is on
(Note 1)
PIC16LF87/88 — 90 — A
A50 I
REF VREF Input Current (Note 2) —
—
—
—
5
150
A
A
During VAIN acquisition.
Based on differential of V
HOLD
to V
AIN to charge CHOLD,
see Section 12.1 “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 specification
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 kThis requires higher acquisition time.