Datasheet

 2008-2011 Microchip Technology Inc. DS39927C-page 173
PIC24F16KA102 FAMILY
22.0 10-BIT HIGH-SPEED A/D
CONVERTER
The 10-bit A/D Converter has the following key
features:
• Successive Approximation (SAR) conversion
• Conversion speeds of up to 500 ksps
• Nine analog input pins
• External voltage reference input pins
• Internal band gap reference inputs
• 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
On all PIC24F16KA102 family devices, the 10-bit A/D
Converter has nine analog input pins, designated AN0
through AN5 and AN10 through AN12. In addition,
there are two analog input pins for external voltage
reference connections (V
REF+ and VREF-). These
voltage reference inputs may be shared with other
analog input pins.
A block diagram of the A/D Converter is displayed in
Figure 22-1.
To perform an A/D conversion:
1. Configure the A/D module:
a) Configure port pins as analog inputs and/or
select band gap reference inputs
(AD1PCFG<15:13>, AD1PCFG<9:6>).
b) Select voltage reference source to match
expected range on analog inputs
(AD1CON2<15:13>).
c) Select the analog conversion clock to match
the desired data rate with the processor
clock (AD1CON3<7:0>).
d) Select the appropriate sample/conversion
sequence (AD1CON1<7:5> and
AD1CON3<12:8>).
e) Select how conversion results are
presented in the buffer (AD1CON1<9:8>).
f) Select interrupt rate (AD1CON2<5:2>).
g) Turn on A/D module (AD1CON1<15>).
2. Configure A/D interrupt (if required):
a) Clear the AD1IF bit.
b) Select A/D interrupt priority.
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
on the 10-Bit High-Speed A/D Converter,
refer to the “PIC24F Family Reference
Manual”, Section 17. “10-Bit A/D
Converter” (DS39705).