PIC24FJ128GA MICROCHIP [Microchip Technology], PIC24FJ128GA Datasheet - Page 167

• Manufacturer Part Number: PIC24FJ128GA
• Description: General Purpose, 16-Bit Flash Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

20.0
The 10-bit A/D converter has the following key
features:
• Successive Approximation (SAR) conversion
• Conversion speeds of up to 500 ksps
• Up to 16 analog input pins
• External voltage reference input pins
• Automatic Channel Scan mode
• Selectable conversion trigger source
• 16-word conversion result buffer
• Selectable Buffer Fill modes
• Four result alignment options
• Operation during CPU Sleep and Idle modes
Depending on the particular device pinout, the 10-bit
A/D converter can have up to 16 analog input pins, des-
ignated AN0 through AN15. In addition, there are two
analog input pins for external voltage reference con-
nections. These voltage reference inputs may be
shared with other analog input pins. The actual number
of analog input pins and external voltage reference
input configuration will depend on the specific device.
Refer to the device data sheet for further details.
A block diagram of the A/D converter is shown in
Figure 20-1.
© 2006 Microchip Technology Inc.
Note:
10-BIT HIGH-SPEED A/D
CONVERTER
This data sheet summarizes the features
of this group of PIC24FJ devices. It is not
intended to be a comprehensive reference
source.
Preliminary
PIC24FJ128GA FAMILY
To perform an A/D conversion:
1.
2.
Configure the A/D module:
a)
b)
c)
d)
e)
f)
g)
Configure A/D interrupt (if required):
a)
b)
Select
(AD1PCFG<15:0>).
Select voltage reference source to match
expected
(AD1CON2<15:13>).
Select the analog conversion clock to
match desired data rate with processor
clock (AD1CON3<7:0>).
Select the appropriate sample/conversion
sequence
AD1CON3<12:8>).
Select
presented in the buffer (AD1CON1<9:8>).
Select interrupt rate (AD1CON2<5:2>).
Turn on A/D module (AD1CON1<15>).
Clear the AD1IF bit.
Select A/D interrupt priority.
port
how
range
pins
(AD1CON1<7:0>
conversion
on
as
DS39747C-page 165
analog
analog
results
inputs
inputs
and
are