PIC16F873-20/ESP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F873-20/ESP

28/40-Pin 8-Bit CMOS FLASH Microcontrollers

Microchip Technology 

PIC16F87X

FIGURE 15-21: A/D CONVERSION TIMING

BSF ADCON0, GO

Q4

A/D CLK 132

A/D DATA

ADRES

ADIF

GO

(TOSC/2)(1)

1 TCY

131

130

9

8

7 ... ...

2

1

0

OLD_DATA

NEW_DATA

DONE

SAMPLE

SAMPLING STOPPED

Note: If the A/D clock source is selected as RC, a time of TCY is added before the A/D clock starts. This allows the SLEEP

instruction to be executed.

TABLE 15-13: A/D CONVERSION REQUIREMENTS

Param

No.

Sym

Characteristic

130 TAD A/D clock period

Standard(F)

Extended(LF)

Standard(F)

Extended(LF)

131 TCNV Conversion time (not including S/H time)

(Note 1)

132 TACQ Acquisition time

Min

Typ†

1.6

—

3.0

—

2.0

4.0

3.0

6.0

—

(Note 2) 40

Max Units

Conditions

—

µs TOSC based, VREF ≥ 3.0V

—

µs TOSC based, VREF ≥ 2.0V

6.0

µs A/D RC mode

9.0

µs A/D RC mode

12

TAD

—

µs

10*

—

—

µs The minimum time is the

amplifier settling time. This may

be used if the "new" input volt-

age has not changed by more

than 1 LSb (i.e., 20.0 mV @

5.12V) from the last sampled

voltage (as stated on CHOLD).

134 TGO Q4 to A/D clock start

— TOSC/2 § —

— If the A/D clock source is

selected as RC, a time of TCY is

added before the A/D clock

starts. This allows the SLEEP

instruction to be executed.

* These parameters are characterized but not tested.

† Data in "Typ" column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are

not tested.

§ This specification ensured by design.

Note 1: ADRES register may be read on the following TCY cycle.

2: See Section 11.1 for minimum conditions.

 2001 Microchip Technology Inc.

DS30292C-page 175

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