GENERAL DESCRIPTION

The 843004-01 is a 4 output LVPECL synthesizer optimized to

generate Ethernet reference clock frequencies and is a member

of the family of high performance clock solutions from IDT. Using

a 25MHz 18pF parallel resonant crystal, the following frequencies

can be generated based on the settings of 2 frequency select pins

(F_SEL[1:0]): 156.25MHz, 125MHz, 62.5MHz. The 843004-01

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 843004-01 is packaged in a small

24-pin TSSOP package.

FEATURES

• Four 3.3V LVPECL outputs

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

• Supports the following output frequencies:

156.25MHz, 125MHz and 62.5MHz

• VCO range: 560MHz - 680MHz

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

(1.875MHz - 20MHz): 0.57ps (typical)

• RMS phase noise at 156.25MHz (typical)

Phase noise:

Offset Noise Power

100Hz ................-95.5 dBc/Hz

1kHz .................-118 dBc/Hz

10kHz .................-126 dBc/Hz

100kHz ..............-126.6 dBc/Hz

• Full 3.3V supply mode

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

• Available in lead-free RoHS compliant package