PIC24FJ128GC010 Datasheet, PDF (369/472 Pages) Microchip Technology – 16-Bit Flash Microcontrollers with 12-Bit Pipeline A/D, Sigma-Delta A/D, USB On-The-Go and XLP Technology

PIC24FJ128GC010 FAMILY
27.0 16-BIT SIGMA-DELTA
ANALOG-TO-DIGITAL (A/D)
CONVERTER
Note:
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
“16-Bit Sigma-Delta A/D Converter”
(DS30687). The information in this data
sheet supersedes the information in the
FRM.
The Sigma-Delta A/D Converter employs sigma-delta
modulation techniques to convert analog signals to a
digital equivalent. This method achieves exceptional
resolution and output code stability, which can signifi-
cantly exceed that of conventional 10-bit or 12-bit
SAR-based A/Ds. A block diagram of the 16-bit
Sigma-Delta A/D is shown in Figure 27-1.
Key features include:
• Adjustable sampling rates
• Configurable A/D data rates between
976 samples per second (highest quality) and
62.5 ksps (highest speed)
• Two differential input channels
• Programmable gain amplifier input
• User-selectable clock sources
• User-selectable oversampling, dithering and data
rounding
• Self-measurement of internal offset and gain error
• Operation in Idle and Sleep modes
• Independent module Reset option
FIGURE 27-1:
SIGMA-DELTA A/D CONVERTER BLOCK DIAGRAM
SDREFP
SVDD
SVREF+
VREF+
CH0+
SVREF+/CH1+
CH1SE
CH0-
SVREF-/CH1-
SVSS
SDCH<2:0>
SVSS
SVREF-
VREF-
SDREFN
VREF+
Filter/Sample
Control and
Interrupt Logic
SDA1IF
DITHER<1:0>
SDGAIN<2:0>
SDINT<1:0>
SDWM<1:0>
RNDRES<1:0>
FILTDIS
+
–
PGA
-
Modulator
SINC³
Low-Pass
Filter
VREF-
SDxRESH
SDxRESL
Primary OSC
FRC
FCY
Clock
Generation
SDDIV<2:0>
SDCS<1:0>
 2012-2013 Microchip Technology Inc.
DS30009312B-page 369