Datasheet

 2009 Microchip Technology Inc. DS39897C-page 275
PIC24FJ256GB110 FAMILY
FIGURE 22-2: 10-BIT A/D CONVERTER ANALOG INPUT MODEL
FIGURE 22-3: A/D TRANSFER FUNCTION
CPIN
VA
Rs
ANx
V
T = 0.6V
VT = 0.6V
I
LEAKAGE
RIC  250
Sampling
Switch
R
SS
CHOLD
= DAC capacitance
V
SS
VDD
= 4.4 pF (Typical)
500 nA
Legend: CPIN
VT
ILEAKAGE
RIC
RSS
CHOLD
= Input Capacitance
= Threshold Voltage
= Leakage Current at the pin due to
= Interconnect Resistance
= Sampling Switch Resistance
= Sample/Hold Capacitance (from DAC)
various junctions
Note: CPIN value depends on device package and is not tested. Effect of CPIN negligible if Rs  5 k.
RSS  5 k(Typical)
6-11 pF
(Typical)
10 0000 0001 (513)
10 0000 0010 (514)
10 0000 0011 (515)
01 1111 1101 (509)
01 1111 1110 (510)
01 1111 1111 (511)
11 1111 1110 (1022)
11 1111 1111 (1023)
00 0000 0000 (0)
00 0000 0001 (1)
Output Code
10 0000 0000 (512)
(VINH – VINL)
V
R-
VR+ – VR-
1024
512*(VR+ – VR-)
1024
VR+
V
R- +
V
R- +
1023*(VR+ – VR-)
1024
VR- +
0
(Binary (Decimal))
Voltage Level