Datasheet

 2011-2013 Microchip Technology Inc. Preliminary DS40001453D-page 365
PIC16(L)F1847
TABLE 30-8: ANALOG-TO-DIGITAL CONVERTER (ADC) CHARACTERISTICS (NOTE 1, 2, 3)
TABLE 30-9: ADC CONVERSION REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Operating temperature Tested at 25°C
Param.
No.
Sym. Characteristic Min. Typ† Max. Units Conditions
AD01 NR Resolution — — 10 bit
AD02 E
IL Integral Error — ±1 ±1.7 LSb VREF = 3.0V
AD03 E
DL Differential Error — ±1 — LSb No missing codes
V
REF = 3.0V
AD04 E
OFF Offset Error — ±1 ±2.5 LSb VREF = 3.0V
AD05 E
GN Gain Error — ±1 ±2.0 LSb VREF = 3.0V
AD06 V
REF Reference Voltage (Note 4) 1.8 — VDD VVREF = (VREF+ minus VREF-)
AD07 V
AIN Full-Scale Range VSS —VREF V
AD08 Z
AIN Recommended Impedance of
Analog Voltage Source
—— 10 k Can go higher if external 0.01F capacitor is
present on input pin.
† Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
Note 1: Total Absolute Error includes integral, differential, offset and gain errors.
2: The ADC conversion result never decreases with an increase in the input voltage and has no missing codes.
3: ADC VREF is from external VREF, VDD or FVR, whichever is selected as reference input.
4: ADC Reference Voltage (Ref+) is the selected reference input, VREF+ pin, VDD pin or the FVR selected as the reference
input, the FVR Buffer1 output selection must be 2.048V or 4.096V (ADFVR<1:0> =
1x).
Standard Operating Conditions (unless otherwise stated)
Operating temperature -40°C  TA  +125°C
Param.
No.
Sym. Characteristic Min. Typ† Max. Units Conditions
AD130* TAD ADC Clock Period 1.0 — 9.0 sFOSC-based
ADC Internal RC Oscillator
Period
1.0 2.5 6.0
s ADCS<1:0> = 11
(FRC Oscillator mode)
AD131 T
CNV Conversion Time (not
including Acquisition Time)
(Note 1)
—11—TAD Set GO/DONE bit to conversion
complete
AD132* T
ACQ Acquisition Time — 5.0 — s
AD133* T
HCD Holding Capacitor Disconnect —
—
0.5*TAD + 40 ns
(0.5*T
AD + 40 ns)
to
(1.5*T
AD + 40 ns)
—
—
ADCS<2:0>
 x11 (FOSC-based)
ADCS<2:0>
 x11 (ADC FRC mode)
* These parameters are characterized but not tested.
† Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
Note 1: The ADRES register may be read on the following TCY cycle.