Overview

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, 17Ω 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 temperature
  • Available in lead-free (RoHS 6) packages

Comparison

Applications

Documentation

Design & Development

Models