PIC16F946 Datasheet, PDF (255/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
TABLE 19-15: PIC16F946 A/D CONVERTER CHARACTERISTICS:
Standard Operating Conditions (unless otherwise stated)
Operating Temperature -40°C ≤ TA ≤ +125°C
Param
No.
Sym
Characteristic
Min
Typ†
Max
Units
Conditions
A01
NR Resolution
—
—
10 bits
bits
A03
EIL Integral Error
—
—
<±1
LSb VREF = 5.0V
A04
EDL Differential Error
—
—
<±1
LSb No missing codes to 10 bits
VREF = 5.0V
A06
EOFF Offset Error
—
—
<±1
LSb VREF = 5.0V
A07
EGN Gain Error
A10
— Monotonicity
—
—
<±1
—
assured⁽¹⁾
—
LSb VREF = 5.0V
— VSS ≤ VAIN ≤ VREF+
A20
VREF Reference Voltage
(VREF+ – VREF-)
2.5
—
VDD
V Full 10-bit accuracy
A21
VREF+ Reference Voltage High VDD – 2.5V
—
VDD + 0.3V V
A22
VREF- Reference Voltage Low VSS – 0.3V
—
VREF+ -2V
V
A25
VAIN Analog Input Voltage
VSS – 0.3V
—
VREF+ +0.3V V
A30
ZAIN Recommended Imped-
—
—
ance of Analog Voltage
Source
10
kΩ
A50
IREF VREF Input Current (2)
—
—
±5
μA During VAIN acquisition.
±150
μA During A/D conversion cycle.
*
†
Note 1:
2:
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.
The A/D conversion result never decreases with an increase in the input voltage and has no missing codes.
VREF+ current is from RA3/AN3/C1+/VREF+/SEG15 pin or VDD, whichever is selected as the VREF+ source.
VREF- current is from RA2/AN2/C2+/VREF-/COM2 pin or VSS, whichever is selected as the VREF- source.
FIGURE 19-17: PIC16F946 A/D CONVERSION TIMING (NORMAL MODE)
BSF ADCON0, GO
134
Q4
A/D CLK
(TOSC/2)⁽¹⁾
131
130
1 TCY
A/D DATA
9
8
7
6
3
2
1
0
ADRES
OLD_DATA
NEW_DATA
ADIF
1 TCY
GO
SAMPLE
132
SAMPLING STOPPED
DONE
Note 1: If the A/D clock source is selected as RC, a time of TCY is added before the A/D clock starts. This allows the
SLEEP instruction to be executed.
© 2005 Microchip Technology Inc.
Preliminary
DS41265A-page 253