General Description
The 843003 is a 3 differential output LVPECL Synthesizer
designed to generate Ethernet refer- ence clock frequencies.
Using a 31.25MHz or 26.041666MHz, 18pF parallel resonant
crystal, the following frequencies can be generated based on the
settings of 4 fre- quency select pins (DIV_SEL[A1:A0],
DIV_SEL[B1:B0]): 625MHz, 312.5MHz, 156.25MHz, and
125MHz. The 843003 has 2 output banks, Bank A with 1
differential LVPECL output pair and Bank B with 2 differential
LVPECL output pairs.
The two banks have their own dedicated frequency select pins and
can be independently set for the frequencies mentioned above.
The 843003 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 843003 is
packaged in a small 24-pin TSSOP package.

Features
• Three 3.3V LVPECL outputs on two banks, A Bank with one
LVPECL pair and B Bank with 2 LVPECL output pairs
• Using a 31.25MHz or 26.041666 crystal, the two output banks
can be independently set for 625MHz, 312.5MHz, 156.25MHz
or 125MHz
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• VCO range: 560MHz – 700MHz
• RMS phase jitter @ 156.25MHz (1.875MHz - 20MHz):
0.51ps (typical)
Offset Noise Power
100Hz ................ -96.8 dBc/Hz
1kHz .................. -119.1 dBc/Hz
10kHz ................ -126.4 dBc/Hz
100kHz .............. -127.0 dBc/Hz
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
• Industrial temperature available upon request
• Available in ead-free (RoHS 6) package