GENERAL DESCRIPTION

The 843002-01 is a 2 output LVPECL 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 843002-

01 uses ICS’ 3rd generation low phase noise VCO technology

and can achieve 1ps or lower typical rms phase jitter, easily

meeting Ethernet jitter requirements. The 843002-01 is

packaged in a small 20-pin TSSOP package.

FEATURES

• Two 3.3V LVPECL outputs

• Selectable crystal oscillator interface

or LVCMOS single-ended input

• Supports the following input frequencies:

156.25MHz, 125MHz and 62.5MHz

• VCO range: 560MHz - 680MHz

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

(1.875MHz-20MHz): 0.54ps (typical)

• Typical phase noise at 156.25MHz

Phase noise:

Offset Noise Power

100Hz ................-97.3 dBc/Hz

1KHz ..............-119.1 dBc/Hz

10KHz ..............-126.4 dBc/Hz

100KHz ..............-127.6 dBc/Hz

• Full 3.3V supply mode

• Lead-Free package fully RoHS compliant

• -30°C to 85°C ambient operating temperature