GENERAL DESCRIPTION

The 844002 is a 2 output LVDS 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_SEL[1:0]):

212.5MHz, 187.5MHz, 159.375MHz, 106.25MHz and 53.125MHz.

The 844002 uses IDT’s 3rd generation low phase noise VCO

technology and can achieve <1ps typical rms phase jitter, easily

meeting Fibre Channel jitter requirements. The 844002 is packaged

in a small 20-pin TSSOP package.

FEATURES

• Two LVDS outputs

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

• Supports the following output frequencies: 212.5MHz,

187.5MHz, 159.375MHz, 106.25MHz and 53.125MHz

• VCO range: 560MHz - 680MHz

• RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal

(637kHz - 10MHz): 0.65ps (typical)

• Full 3.3V or 2.5V supply modes

• 0°C to 70°C ambient operating temperature

• Available in lead-free (RoHS 6) package