PIC24HJ128GP206-I Datasheet, PDF (206/286 Pages) Microchip Technology – High-Performance, 16-Bit Microcontrollers

PIC24HJXXXGPX06/X08/X10
EQUATION 19-1: A/D CONVERSION CLOCK PERIOD
TAD = TCY(ADCS + 1)
ADCS =
TAD
TCY
–1
FIGURE 19-3:
A/D TRANSFER FUNCTION (10-BIT EXAMPLE)
Output Code
11 1111 1111 (= 1023)
11 1111 1110 (= 1022)
10 0000 0011 (= 515)
10 0000 0010 (= 514)
10 0000 0001 (= 513)
10 0000 0000 (= 512)
01 1111 1111 (= 511)
01 1111 1110 (= 510)
01 1111 1101 (= 509)
00 0000 0001 (= 1)
00 0000 0000 (= 0)
VREFL _{VREFL + VREFH – VREFL}
1024
VREFL + ^{512 * (VREFH – VREFL)}
1024
1023 * (VREFH – VREFL) ^VREFH
VREFL +
1024
(VINH – VINL)
FIGURE 19-4:
ADC CONVERSION CLOCK PERIOD BLOCK DIAGRAM
ADxCON3<15>
ADC Internal
RC Clock
ADxCON3<5:0>
6
0
TAD
1
TOSC⁽¹⁾
X2
TCY
ADC Conversion
Clock Multiplier
1, 2, 3, 4, 5,..., 64
Note:
Refer to Figure 8-2 for the derivation of FOSC when the PLL is enabled. If the PLL is not used, FOSC is equal to
the clock source frequency. TOSC = 1/FOSC.
DS70175F-page 204
© 2007 Microchip Technology Inc.