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PIC18F2221_1 Datasheet, PDF (370/402 Pages) Microchip Technology – Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology | |||
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PIC18F2221/2321/4221/4321 FAMILY
TABLE 27-24: A/D CONVERTER CHARACTERISTICS
Param
No.
Symbol
Characteristic
Min
Typ
Max Units
Conditions
A01 NR
Resolution
â
â
10
bit ÎVREF ⥠3.0V
A03 EIL
Integral Linearity Error
â
â
<±1
LSb ÎVREF ⥠3.0V
A04 EDL Differential Linearity Error
â
â
<±1
LSb ÎVREF ⥠3.0V
A06 EOFF Offset Error
â
â
<±2
LSb ÎVREF ⥠3.0V
A07 EGN
A10 â
Gain Error
Monotonicity
â
â
<±1
Guaranteed(1)
LSb ÎVREF ⥠3.0V
â VSS ⤠VAIN ⤠VREF
A20 ÎVREF Reference Voltage Range
(VREFH â VREFL)
1.8
â
3
â
â
V VDD < 3.0V
â
V VDD ⥠3.0V
A21 VREFH Reference Voltage High
â
â VDD + 3.0V V
A22 VREFL Reference Voltage Low
VSS â 0.3V â
â
V
A25 VAIN Analog Input Voltage
VREFL
â
VREFH
V
A30 ZAIN Recommended Impedance of
â
â
2.5
kΩ
Analog Voltage Source
A50 IREF VREF Input Current(2)
â
â
5
μA During VAIN acquisition.
â
â
150
μA During A/D conversion
cycle.
Note 1: The A/D conversion result never decreases with an increase in the input voltage and has no missing codes.
2: VREFH current is from RA3/AN3/VREF+ pin or VDD, whichever is selected as the VREFH source.
VREFL current is from RA2/AN2/VREF-/CVREF pin or VSS, whichever is selected as the VREFL source.
DS39689F-page 370
© 2009 Microchip Technology Inc.
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