Datasheet
2010 Microchip Technology Inc. DS39616D-page 361
PIC18F2331/2431/4331/4431
TABLE 26-20: A/D CONVERTER CHARACTERISTICS
PIC18LF2331/2431/4331/4431
(Industrial)
Standard Operating Conditions (unless otherwise stated)
Operating temperature -40°C T
A +85°C for industrial
PIC18F2331/2431/4331/4431
(Industrial)
Standard Operating Conditions (unless otherwise stated)
Operating temperature -40°C T
A +85°C for industrial
-40°C T
A +125°C for extended
Param
No.
Symbol Characteristic Min Typ Max Units Conditions
Device Supply
AV
DD Analog VDD Supply VDD – 0.3 — VDD + 0.3 V
AV
SS Analog VSS Supply VSS – 0.3 — VSS + 0.3 V
I
AD Module Current
(during conversion)
—
—
500
250
—
—
A
A
VDD = 5V
V
DD = 2.5V
I
ADO Module Current Off — — 1.0 A
AC Timing Parameters
A10 F
THR Throughput Rate —
—
—
—
200
75
ksps
ksps
VDD = 5V, single channel
V
DD < 3V, single channel
A11 T
AD A/D Clock Period 385
1000
—
—
20,000
20,000
ns
ns
VDD = 5V
V
DD = 3V
A12 T
RC A/D Internal RC Oscillator Period —
—
—
500
750
10000
1500
2250
20000
ns
ns
ns
PIC18F parts
PIC18LF parts
AV
DD < 3.0V
A13 T
CNV Conversion Time
(1)
12 12 12 TAD
A14 TACQ Acquisition Time
(2)
2
(2)
——TAD
A16 TTC Conversion Start from External 1/4 TCY ——
Reference Inputs
A20 V
REF Reference Voltage for 10-Bit
Resolution (V
REF+ – VREF-)
1.5
1.8
—
—
AV
DD – AVSS
AVDD – AVSS
V
V
VDD 3V
V
DD < 3V
A21 V
REFH Reference Voltage High (AVDD or VREF+) 1.5V — AVDD VVDD 3V
A22 V
REFL Reference Voltage Low (AVSS or VREF-) AVSS —VREFH – 1.5V V
A23 I
REF Reference Current —
—
150 A
75 A
—
—
VDD = 5V
V
DD = 2.5V
Analog Input Characteristics
A26 V
AIN Input Voltage
(3)
AVSS – 0.3 — AVDD + 0.3 V
A30 Z
AIN Recommended Impedance of Analog
Voltage Source
—— 2.5k
A31 Z
CHIN Analog Channel Input Impedance — — 10.0 k VDD = 3.0V
DC Performance
A41 N
R Resolution 10 bits —
A42 E
IL Integral Nonlinearity — — <1LSbVDD 3.0V
V
REFH 3.0V
A43 E
IL Differential Nonlinearity — — <1LSbVDD 3.0V
V
REFH 3.0V
A45 E
OFF Offset Error — 0.5 <1.5 LSb VDD 3.0V
V
REFH 3.0V
A46 E
GA Gain Error — 0.5 <1.5 LSb VDD 3.0V
V
REFH 3.0V
A47 — Monotonicity
(4)
guaranteed — VDD 3.0V
V
REFH 3.0V
Note 1: Conversion time does not include acquisition time. See Section 21.0 “10-Bit High-Speed Analog-to-Digital Converter
(A/D) Module” for a full discussion of acquisition time requirements.
2: In Sequential modes, T
ACQ should be 12 TAD or greater.
3: For V
DD < 2.7V and temperature below 0°C, VAIN should be limited to range < VDD/2.
4: The A/D conversion result never decreases with an increase in the input voltage and has no missing codes.