General Description
The 840002-01 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 840002-01 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 840002-01 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
• 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
• Full 3.3V or mixed 3.3V core/2.5V output supply modes
• -30°C to 85°C ambient operating temperat