The 841N4830 is a 3 HCSL, 1 LVPECL and 2 LVCMOS output Synthesizer optimized to generate PCI Express reference clock frequencies. The device uses Renesas' fourth generation FemtoClock™ NG technology for synthesis of high clock frequency at very low phase noise. It provides low power consumption with good power supply noise rejection. Using a 25MHz, 12pF parallel resonant crystal, the following frequencies can be generated: 100MHz, 50MHz and 25MHz. Maximum rms phase jitter of 0.27ps, easily meets PCI Express jitter requirements. The 841N4830 is packaged in a small 32-pin VFQFN package.


  • Fourth generation FemtoClock™ Next Generation (NG) technology
  • Three differential HCSL outputs, one differential LVPECL and two single-ended LVCMOS/LVTTL outputs
  • Crystal oscillator interface designed for a 25MHz, 12pF parallel resonant crystal
  • CLK/nCLK input pair can accept the following differential input levels: LVPECL, LVDS, HCSL
  • A 25MHz crystal generates output frequencies of: 100MHz, 50MHz and 25MHz
  • VCO frequency: 2GHz
  • RMS Phase Jitter @ 100MHz, (12kHz – 20MHz) using a 25MHz crystal: 0.36ps (maximum)
  • Power supply noise rejection PSNR: -45dB (typical)
  • PCI Express Gen 2 (5 Gb/s) jitter compliant
  • Full 3.3V supply mode
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package




Design & Development