PIC24FJ128GC010 Datasheet, PDF (341/472 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
25.0 OVERVIEW OF ADVANCED
ANALOG FEATURES
The defining feature of PIC24FJ128GC010 family
devices is the collection of analog peripherals,
designed to extend the range of PIC24F microcontrol-
lers into high-performance analog and mixed-signal
applications. All devices include a set of new advanced
modules and several existing analog peripherals, plus
a common voltage reference for ease of use.
The analog block includes four new modules:
• 12-Bit High-Speed, Pipeline A/D Converter
(described in Section 26.0 “12-Bit High-Speed,
Pipeline A/D Converter”)
• 16-Bit Sigma-Delta A/D (described
in Section 27.0, 16-Bit Sigma-Delta
Analog-to-Digital (A/D) Converter)
• Dual 10-Bit Digital-to-Analog Convert-
ers (described in Section 28.0, 10-Bit
Digital-to-Analog Converter (DAC))
• Dual Operational Amplifiers (described in
Section 29.0, Dual Operational Amplifier
Module)
It also includes these legacy PIC24F analog modules:
• Triple Comparator module (described in
Section 30.0, Triple Comparator Module) with
independent voltage reference (described in
Section 31.0, Comparator Voltage Reference)
• CTMU (described in Section 32.0, Charge Time
Measurement Unit (CTMU))
A high-level overview of the analog block and its inte-
grating features is shown in Figure 25-1. For a more
detailed diagram of each module and an explanation of
its operation, please refer to the appropriate chapter.
25.1 Shared Analog Pins
Apart from the reserved differential inputs for the
Sigma-Delta A/D Converter, PIC24FJ128GC010 family
devices may have up to 50 analog input channels (in
100-pin devices). Because of the number of analog
features available on the microcontroller, many of the
inputs and outputs of the other advanced analog
modules share pins with these channels.
Table 25-1 describes how features are multiplexed.
Note that not all of these analog channels and their
shared analog peripherals are available on all devices.
25.2 Internal Band Gap References
As an integrating feature, the analog block of
PIC24FJ128GC010 family devices includes a common
internal voltage reference source. This band gap
provides several functions:
• A single, configurable internal reference source
(BGBUF0) for all on-chip analog consumers
• Two additional and independently programmable
band gap sources that can provide buffered
internal references (BGBUF1 and BGBUF2) to
external pins
• Independent configurability of all sources in Idle,
Sleep and other low-power modes, allowing for
flexibility in power consumption
The reference sources are controlled by three
registers: BUFCON0 for the internal reference
(Register 25-1), and BUFCON1 and BUFCON2
(Register 25-2) for the buffered references.
 2012-2013 Microchip Technology Inc.
DS30009312B-page 341