PIC24HJ12GP201 Datasheet, PDF (155/234 Pages) Microchip Technology – High-Performance, 16-Bit Microcontrollers

PIC24HJ12GP201/202
EQUATION 17-1: ADC CONVERSION CLOCK PERIOD
TAD = TCY(ADCS + 1)
ADCS =
TAD
TCY
–1
FIGURE 17-2:
ADC 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
512 * (VREFH – VREFL)
VREFL +
1024
VREFL + ^{1023 * (VREFH – VREFL) VREFH}
1024
(VINH – VINL)
FIGURE 17-3:
ADC CONVERSION CLOCK PERIOD BLOCK DIAGRAM
AD1CON3<15>
ADC Internal
RC Clock
AD1CON3<5:0>
0
TAD
1
6
TOSC⁽¹⁾
X2
TCY
ADC Conversion
Clock Multiplier
1, 2, 3, 4, 5,..., 64
Note:
Refer to Figure 7-2 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.
© 2007 Microchip Technology Inc.
Preliminary
DS70282B-page 153