1 to 220 MHz, Differential Digitally-controlled XO

The SiT3921 is a highly flexible, differential DCXO with LVPECL and LVDS outputs. This programmable device supports any frequency, 1 to 220 MHz, along with any combination of voltage (1.8 V, 2.5 V-3.3 V), pull range (±25 ppm to ±200 ppm) and package (3225, 5032, 7050). It enables frequency tuning via a unique one-wire interface, eliminating frequency drift that is caused by board noise and simplifying PLL and clock synchronization design. It comes in 3 industry-standard 6-pin packages (3.2x2.5 mm, 5.0x3.2 mm, 7.0x5.0 mm).

Three industry standard footprints for drop-in replacement of quartz VCXOs with minor design modification
Oscillator Type DCXO-DE
Frequency 1 to 220 MHz
Frequency Stability (ppm) ±10, ±25, ±50
Operating Temperature Range (°C) -20 to +70, -40 to +85
Output type LVPECL, LVDS
Package Type (mm²) 3.2x2.5, 5.0x3.2, 7.0x5.0
Phase Jitter (RMS) 0.5 ps
Features Digitally controlled, Field Programmable
Voltage Supply (V) 2.5, 3.3
Pull Range (ppm) ±25, ±50, ±100, ±200, ±400, ±800, ±1600
Availability Production
  • Digitally controlled 1 ppb frequency pull resolution
  • Frequency from 1 MHz to 220 MHz
  • Supply voltage of 1.8 V; 2.5 V to 3.3 V
  • Frequency stability from ±10 ppm to ±50 ppm
  • Pull range from ±25 ppm to ±1600 ppm:
  • Eliminating a need for external DAC
  • Customized specification for optimal system performance
  • Easy availability of any device specifications within the operating range

One-wire digital frequency tuning

  • Simpler loop control in software controlled system PLL
  • More consistent PLL bandwidth over operating range
  • Faster calibration and lock time
  • Reduction of modulation harmonics;

Three industry-standard packages

  • Minor modification to existing design using VCXO to adopt the DCXO;

4 to 6 weeks lead time

  • Reduce inventory overhead
  • Mitigate shortage risks

 

  • Networking and communication systems
  • Networked video systems and digitizers
  • Jitter cleaner
  • Networked audio systems
  • Instrumentation
  • Low-bandwidth analog phase locked loop (PLL)
  • FPGA data recovery

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