2013 Microchip Technology Inc.
Advance Information
DS33030A-page 295
PIC24FV16KM204 FAMILY
FIGURE 27-19:
A/D CONVERSION TIMING
TABLE 27-38: A/D CONVERSION TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 1.8V to 3.6V (PIC24F16KM204)
2.0V to 5.5V (PIC24FV16KM204)
Operating temperature
-40°C
T
A
+85°C for Industrial
-40°C
T
A
+125°C for Extended
Param
No.
Sym
Characteristic
Min.
Typ
Max.
Units
Conditions
Clock Parameters
AD50
T
AD
A/D Clock Period
600
—
—
ns
T
CY
= 75 ns, AD1CON3 in
default state
AD51
T
RC
A/D Internal RC Oscillator Period
—
1.67
—
µs
Conversion Rate
AD55
T
CONV
Conversion Time
—
—
12
14
—
—
T
AD
T
AD
10-bit results
12-bit results
AD56
F
CNV
Throughput Rate
—
—
100
ksps
AD57
T
SAMP
Sample Time
—
1
—
T
AD
AD58
T
ACQ
Acquisition Time
750
—
—
ns
(Note
AD59
T
SWC
Switching Time from Convert to
Sample
—
—
)
AD60
T
DIS
Discharge Time
12
—
—
T
AD
Clock Parameters
AD61
T
PSS
Sample Start Delay from
Setting Sample bit (SAMP)
2
—
3
T
AD
Note 1:
Because the sample caps will eventually lose charge, clock rates below 10 kHz can affect linearity
performance, especially at elevated temperatures.
2:
The time for the holding capacitor to acquire the “New” input voltage when the voltage changes full scale
after the conversion (V
DD
to V
SS
or V
SS
to V
DD
).
3:
On the following cycle of the device clock.
AD55
AD50
AD58
BCLR AD1CON1, SAMP
Q3/Q4
A/D CLK
(1)
A/D DATA
ADC1BUFn
AD1IF
SAMP
OLD DATA
SAMPLING STOPPED
NEW DATA
(Note 2)
11
10
9
2
1
0
Note 1:
If the A/D clock source is selected as RC, a time of T
CY
is added before the A/D clock starts. This allows the
SLEEP
instruction to be executed.
2:
This is a minimal RC delay (typically 100 ns) which also disconnects the holding capacitor from the analog input.
. . . . . .
T
CY
BSET AD1CON1, SAMP
AD59
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