General Description

The 844002I-01 is a 2 output LVDS Synthesizer optimized to

generate Ethernet reference clock frequencies. Using a 25MHz,

18pF parallel resonant crystal, the following frequencies can be

generated based on the 2 frequency

select pins (F_SEL[1:0]): 156.25MHz, 125MHz and 62.5MHz. The

844002I-01 uses IDT’s 3rd generation low phase noise VCO

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

meeting Ethernet jitter requirements. The 844002I-01 is packaged

in a small 20-pin TSSOP package.

Features

• Two differential LVDS outputs

• Selectable crystal oscillator interface or

single-ended LVCMOS/LVTTL input

• Supports the following output frequencies: 156.25MHz,

125MHz, 62.5MHz

• VCO range: 560MHz – 680MHz

• RMS phase jitter @ 156.25MHz, using a 25MHz crystal

(1.875MHz – 20MHz): 0.41ps (typical)

• Full 2.5V supply mode

• -40°C to 85°C ambient operating temperature

• Available in lead-free (RoHS 6) package