PIC16F1938 Datasheet, PDF (401/452 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers

PIC16(L)F1938/9
TABLE 30-8: PIC16(L)F1938/39 A/D CONVERTER (ADC) CHARACTERISTICS:
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 EIL Integral Error
—
—
±1.7 LSb VREF = 3.0V
AD03 EDL Differential Error
—
—
±1 LSb No missing codes
VREF = 3.0V
AD04 EOFF Offset Error
—
—
±2.5 LSb VREF = 3.0V
AD05 EGN Gain Error
—
—
±2.0 LSb VREF = 3.0V
AD06 VREF Reference Voltage⁽³⁾
1.8
—
VDD V VREF = (VREF+ minus VREF-) (Note 5)
AD07 VAIN Full-Scale Range
VSS
—
VREF V
AD08 ZAIN Recommended Impedance of
Analog Voltage Source
—
—
10 k Can go higher if external 0.01F capacitor is
present on input pin.
* 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: Total Absolute Error includes integral, differential, offset and gain errors.
2: The A/D conversion result never decreases with an increase in the input voltage and has no missing codes.
3: ADC VREF is from external VREF, VDD pin or FVR, whichever is selected as reference input.
4: When ADC is off, it will not consume any current other than leakage current. The power-down current specification
includes any such leakage from the ADC module.
5: FVR voltage selected must be 2.048V or 4.096V.
TABLE 30-9: PIC16(L)F1938/39 A/D CONVERSION REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Operating temperature -40°C  TA  +125°C
Param
No.
Sym.
Characteristic
Min.
Typ†
Max. Units
Conditions
AD130* TAD A/D Clock Period
1.0
—
9.0
s TOSC-based
A/D Internal RC Oscillator
Period
1.0
2.5
6.0 s ADCS<1:0> = 11 (ADRC mode)
AD131 TCNV Conversion Time (not including —
11
— TAD Set GO/DONE bit to conversion
Acquisition Time)⁽¹⁾
complete
AD132* TACQ Acquisition Time
—
5.0
—
s
*
†
Note 1:
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.
The ADRES register may be read on the following TCY cycle.
 2011 Microchip Technology Inc.
Preliminary
DS41574A-page 401