30F4013 datasheet(209/228 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS70138G-page 209

dsPIC30F3014/4013

TABLE 23-38: 12-BIT A/D CONVERSION TIMING REQUIREMENTS

AC CHARACTERISTICS

Standard Operating Conditions: 2.7V to 5.5V

(unless otherwise stated)

Operating temperature

-40°C

 TA  +85°C for Industrial

-40°C

 TA  +125°C for Extended

Param

No.

Symbol

Characteristic

Min.

Typ

Max.

Units

Conditions

Clock Parameters

AD50

TAD

A/D Clock Period

334

—

VDD = 3-5.5V (Note 1)

AD51

tRC

A/D Internal RC Oscillator Period

1.2

1.5

1.8

s

Conversion Rate

AD55

tCONV

Conversion Time

—

14 TAD

AD56

FCNV

Throughput Rate

—

200

—

ksps

VDD = VREF = 5V

AD57

TSAMP

Sampling Time

1 TAD

——

VDD = 3-5.5V source

resistance

RS = 0-2.5 k



Timing Parameters

AD60

tPCS

Conversion Start from Sample

Trigger

—1 TAD

—ns

AD61

tPSS

Sample Start from Setting

Sample (SAMP) Bit

0.5 TAD

—1.5

TAD

AD62

tCSS

Conversion Completion to

Sample Start (ASAM = 1)

—0.5 TAD

—ns

AD63

tDPU(2)

Time to Stabilize Analog Stage

from A/D Off to A/D On

——

s

Note 1:

Because the sample caps will eventually lose charge, clock rates below 10 kHz can affect linearity

performance, especially at elevated temperatures.

tDPU is the time required for the ADC module to stabilize when it is turned on (ADCON1<ADON> = 1).

During this time the ADC result is indeterminate.

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