SIT3921

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).

• 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