D301 datasheet(373/416 Pages) MICROCHIP

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DS30010118D-page 373

PIC24FJ256GA705 FAMILY

TABLE 32-19: AC SPECIFICATIONS FOR PHASE-LOCKED LOOP MODE

AC CHARACTERISTICS

Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)

Operating temperature

-40°C

 TA  +85°C for Industrial

-40°C

 TA  +125°C for Extended

Sym

Characteristic

Min

Typ

Max

Units

Conditions

FIN

Input Frequency Range

—

MHz

FMIN

Minimum Output Frequency from the

Frequency Multiplier

—

MHz

4 MHz FIN with 4x feedback ratio,

2 MHz FIN with 8x feedback ratio

FMAX

Maximum Output Frequency from the

Frequency Multiplier

—

MHz

4 MHz FIN with 24x net multiplication ratio,

24 MHz FIN with 4x net multiplication ratio

FSLEW Maximum Step Function of FIN at which

the PLL will be Ensured to Maintain Lock

-4

—

Full input range of FIN

TLOCK Lock Time for VCO

—

µs

With the specified minimum, TREF, and a

lock timer count of one cycle, this is the

maximum VCO lock time supported

JFM8

Cumulative Jitter of Frequency Multiplier

Over Voltage and Temperature during Any

Eight Consecutive Cycles of the PLL Output

——

±0.12

4 MHz FIN with 4x feedback ratio

TABLE 32-20: INTERNAL RC ACCURACY

AC CHARACTERISTICS

Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)

Operating temperature

-40°C

 TA  +85°C for Industrial

-40°C

 TA  +125°C for Extended

Param

No.

Characteristic

Min

Typ

Max

Units

Conditions

F20

FRC Accuracy @ 8 MHz

-1.5

+0.15

1.5

2.0V

 VDD 3.6V, 0°C  TA +85°C

(Note 1)

-2

—

2.0V

 VDD 3.6V, -40°C  TA 0°C

-4

—

2.0V

 VDD 3.6V, +85°C  TA 125°C

F21

LPRC @ 31 kHz

-20

—

VCAP Output Voltage = 1.8V

F22

OSCTUN Step-Size

—

0.1

—

%/bit

Note 1:

To achieve this accuracy, physical stress applied to the microcontroller package (ex., by flexing the PCB)

must be kept to a minimum.

TABLE 32-21: RC OSCILLATOR START-UP TIME

AC CHARACTERISTICS

Standard Operating Conditions: 2.0V to 3.6V (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

FR0

TFRC

FRC Oscillator Start-up

Time

—15

—

µs

FR1

TLPRC

Low-Power RC Oscillator

Start-up Time

—50

—

µs

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