General Description

The 840002I-01 is a two output LVCMOS/LVTTL Synthesizer

optimized to generate Ethernet reference clock frequencies. Using a

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

be generated based on the two frequency select pins (F_SEL[1:0]):

156.25MHz, 125MHz, and 62.5MHz. The 840002I-01 uses IDT’s 3RD

generation low phase noise VCO technology and can achieve 1ps or

lower typical random rms phase jitter, easily meeting Ethernet jitter

requirements. The 840002I-01 is packaged in a small 16-pin TSSOP

package.

Features

• Two LVCMOS/LVTTL outputs@ 3.3V,

17 typical output impedance

• Selectable crystal oscillator interface or LVCMOS/LVTTL

single-ended TEST_CLK

• Supports the following output frequencies: 156.25MHz, 125MHz

and 62.5MHz

• Output frequency range: 56MHz to 175MHz

• VCO range: 560MHz to 700MHz

• Output skew: 12ps (maximum)

• RMS phase jitter at 156.25MHz, (1.875MHz to 20MHz):

0.47ps (typical)

Phase Noise:

Offset Noise Power

100Hz................ -97.4 dBc/Hz

1kHz .................. -120.2 dBc/Hz

10kHz ................ -127.6 dBc/Hz

100kHz .............. -126.1 dBc/Hz

• Power Supply Modes:

Core / Output

3.3V / 3.3V

3.3V / 2.5V

2.5V / 2.5V

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

• Available in lead-free (RoHS 6) package