ADUCM350BBCZ datasheet(12/41 Pages) AD

12 / 41 page

Data Sheet

ADuCM350

Rev. A | Page 11 of 40

On-Chip RC Oscillators

Table 20. On-Chip RC Oscillators Specifications

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

HIGH FREQUENCY RC OSCILLATOR

Frequency

MHz

Accuracy

−5

Start-Up Time

µs

LOW FREQUENCY RC OSCILLATOR

Frequency

32,768

Accuracy

−20

+20

Start-Up Time

980

µs

PLLs

Table 21. PLL Specifications

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

SYSTEM PLL

Input Frequency

MHz

Output Frequency

MHz

Frequency Error

2500

ppm

RMS Jitter

@ 32 MHz, external XTAL

USB PLL

Input Frequency

MHz

Output Frequency

MHz

16 MHz input

Frequency Error

2500

ppm

Period Jitter

@ 60 MHz, external XTAL

Watchdog, Wake-Up, and General-Purpose Timers

Table 22. Watchdog, Wake-Up, and General-Purpose Timers Specifications

Parameter1

Min

Typ

Max

Unit

Test Conditions/Comments

WATCHDOG TIMERS

Timeout Period

Shortest

0.03

32,768 Hz clock, prescaler = 1

Longest

8191

sec

32,768 Hz clock, prescaler = 4096

WAKE-UP TIMERS

Timeout Period

Shortest

62.5

16 MHz clock, prescaler = 1

Longest

136

Years

32,768 Hz clock, prescaler = 32,768

GENERAL-PURPOSE TIMER × 3

Timeout Period

Shortest

62.5

16 MHz clock, prescaler = 1

Longest

65,535

sec

32,768 Hz clock, prescaler = 32,768

Timer Output PWM Frequency

MHz

Guaranteed by design.

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