GENERAL DESCRIPTION

The 840002 is a 2 output LVCMOS/LVTTL Synthesizer optimized

to generate Fibre Channel reference clock frequencies. Using a

26.5625MHz, 18pF parallel resonant crystal, the following frequencies

can be generated based on the 2 frequency select pins (F_SEL1:0):

212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and 53.125MHz.

The 840002 uses low phase noise VCO technology and can achieve

1ps or lower typical rms phase jitter, easily meeting Fibre Channel jitter

requirements. The 840002 is packaged in a 16-pin TSSOP package.

FEATURES

• Two LVCMOS outputs @ 3.3V, 17Ω typical output impedance

• Selectable crystal oscillator interface

or LVCMOS single-ended input

• Output frequency range: 46.66MHz - 233.33MHz

• VCO range: 560MHz - 700MHz

• Supports the following output frequencies: 212.5MHz,

159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz

• RMS phase jitter @ 212.5MHz (637kHz - 10MHz):

0.83ps (typical)

Typical phase noise at 212.5MHz:

Offset Noise Power

100Hz ................-91.3 dBc/Hz

1kHz ..............-114.3 dBc/Hz

10kHz ..............-120.7 dBc/Hz

100kHz ..............-120.2 dBc/Hz

• Full 3.3V or 3.3V core/2.5V output supply modes

• 0°C to 70°C ambient operating temperature

• Available in lead-free RoHS compliant package