General Description
The 844003 is a three differential output LVDS Synthesizer designed
to generate Ethernet reference clock frequencies. Using a 31.25MHz
or 26.041666MHz, 18pF parallel resonant crystal, the following
frequencies can be generated based on the settings of four
frequency select pins (DIV_SEL[A1:A0], DIV_SEL[B1:B0]): 625MHz,
312.5MHz, 156.25MHz, and 125MHz. The 844003 has two output
banks, Bank A with one differential LVDS output pair and
Bank B with two differential LVDS output pairs.
The two banks have their own dedicated frequency select pins and
can be independently set for the frequencies mentioned above. The
844003 uses IDT’s 3rd generation low phase noise VCO technology
and can achieve 1ps or lower typical rms phase jitter, easily meeting
Ethernet jitter requirements. The 844003 is packaged in a small
24-pin TSSOP package.

Features
• Three LVDS outputs on two banks, A Bank with one LVDS pair
and B Bank with two LVDS output pairs
• Using a 31.25MHz or 26.041666MHz crystal, the two output
banks can be independently set for 625MHz, 312.5MHz,
156.25MHz or 125MHz
• Selectable crystal oscillator interface or LVCMOS/LVTTL
single-ended input
• VCO range: 560MHz to 700MHz
• RMS phase jitter @ 156.25MHz (1.875MHz - 20MHz): 0.63ps (typical)
• 3.3V output supply mode
• 0°C to 70°C ambient operating temperature
• Available in lead-free (RoHS 6) packaging