Datasheet

© 2009 Microchip Technology Inc. DS70286C-page 293
dsPIC33FJXXXGPX06/X08/X10
TABLE 25-40: ADC CONVERSION (12-BIT MODE) TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C ≤ T
A ≤ +85°C for Industrial
Param
No.
Symbol Characteristic Min. Typ
(1)
Max. Units Conditions
Clock Parameters
AD50a TAD ADC Clock Period 117.6 — — ns —
AD51a tRC ADC Internal RC Oscillator
Period
— 250 — ns —
Conversion Rate
AD55a t
CONV Conversion Time — 14 TAD ns —
AD56a F
CNV Throughput Rate — — 500 ksps —
AD57a TSAMP Sample Time 3 TAD —— — —
Timing Parameters
AD60a t
PCS Conversion Start from Sample
Trigger
(2)
2.0 TAD — 3.0 TAD — Auto-Convert Trigger
(SSRC<2:0> = 111) not
selected
AD61a t
PSS Sample Start from Setting
Sample (SAMP) bit
(2)
2.0 TAD — 3.0 TAD ——
AD62a t
CSS Conversion Completion to
Sample Start (ASAM = 1)
(2)
— 0.5 TAD —— —
AD63a t
DPU Time to Stabilize Analog Stage
from ADC Off to ADC On
(2,3)
——20μs—
Note 1: These parameters are characterized but not tested in manufacturing.
2: Because the sample caps will eventually lose charge, clock rates below 10 kHz can affect linearity
performance, especially at elevated temperatures.
3: t
DPU is the time required for the ADC module to stabilize when it is turned on (AD1CON1<ADON> = 1).
During this time, the ADC result is indeterminate.