Datasheet
2011-2013 Microchip Technology Inc. DS70000657H-page 463
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
TABLE 30-60: ADC CONVERSION (12-BIT MODE) TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
(1)
Operating temperature -40°C TA +85°C for Industrial
-40°C T
A +125°C for Extended
Param
No.
Symbol Characteristic Min. Typ. Max. Units Conditions
Clock Parameters
AD50 T
AD ADC Clock Period 117.6 — — ns
AD51 tRC
ADC Internal RC Oscillator Period
(2)
—250— ns
Conversion Rate
AD55 t
CONV Conversion Time — 14 TAD ns
AD56 FCNV Throughput Rate — — 500 ksps
AD57a TSAMP Sample Time when Sampling any
ANx Input
3 TAD —— —
AD57b T
SAMP Sample Time when Sampling the Op
Amp Outputs (Configuration A
and
Configuration B)
(4,5)
3 TAD —— —
Timing Parameters
AD60 tPCS Conversion Start from Sample
Trigger
(
2
,3)
2 TAD —3 TAD — Auto-convert trigger is
not selected
AD61 t
PSS Sample Start from Setting
Sample (SAMP) bit
(
2
,3)
2 TAD —3 TAD —
AD62 t
CSS Conversion Completion to
Sample Start (ASAM = 1)
(
2
,3)
— 0.5 TAD ——
AD63 t
DPU Time to Stabilize Analog Stage
from ADC Off to ADC On
(
2
,3)
——20s (Note 6)
Note 1: Device is functional at V
BORMIN < VDD < VDDMIN, but will have degraded performance. Device functionality
is tested, but not characterized. Analog modules (ADC, op amp/comparator and comparator voltage
reference) may have degraded performance. Refer to Parameter BO10 in Table 30-13 for the minimum
and maximum BOR values.
2: Parameters are characterized but not tested in manufacturing.
3: Because the sample caps will eventually lose charge, clock rates below 10 kHz may affect linearity
performance, especially at elevated temperatures.
4: See Figure 25-6 for configuration information.
5: See Figure 25-7 for configuration information.
6: The parameter, t
DPU, is the time required for the ADC module to stabilize at the appropriate level when the
module is turned on (ADON (AD1CON1<15>) = 1). During this time, the ADC result is indeterminate.