General Description

The 844004-104 is a 4 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 844004-104 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 844004-104 is packaged in a 32-pin VFQFN

package.

Features

• Four differential 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 at 212.5MHz (637kHz – 10MHz), using a

26.5625MHz crystal: <1ps (typical)

• Full 3.3V or 2.5V output supply modes

• 0°C to 70°C ambient operating temperature

• Available in lead-free (RoHS 6) packages