AFS090 datasheet(36/334 Pages) MICROSEMI

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Device Architecture

2- 20

R e visio n 2

RC Oscillator

The RC oscillator is an on-chip free-running clock source generating a 100 MHz clock. It can be used as

a source clock for both on-chip and off-chip resources. When used in conjunction with the Fusion PLL

and CCC circuits, the RC oscillator clock source can be used to generate clocks of varying frequency

and phase.

The Fusion RC oscillator is very accurate at ±1% over commercial and industrial temperature ranges. It

is an automated clock, requiring no setup or configuration by the user. It requires only that the power and

GNDOSC pins be connected; no external components are required. The RC oscillator can be used to

drive either a PLL or another internal signal.

RC Oscillator Characteristics

Table 2-9 • Electrical Characteristics of RC Oscillator

Parameter

Description

Conditions

Min.

Typ.

Max.

Units

FRC

Operating

Frequency

100

MHz

Accuracy

Temperature: 0°C to 85°C

Voltage: 3.3 V ± 5%

Temperature: –40°C to 125°C

Voltage: 3.3 V ± 5%

Output Jitter

Period Jitter (at 5 k cycles)

100

Cycle–Cycle Jitter (at 5 k cycles)

100

Period Jitter (at 5 k cycles) with

1 KHz / 300 mV peak-to-peak noise

on power supply

150

Cycle–Cycle Jitter (at 5 k cycles) with

1 KHz / 300 mV peak-to-peak noise

on power supply

150

Output Duty Cycle

IDYNRC

Operating Current

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