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The SiT3809 is a highly flexible high-frequency MEMS voltage-controlled oscillator (VCXO) with LVCMOS output. This device supports any combination of frequencies (80.000001 to 220 MHz), voltage (1.8 V; 2.5 V to 3.3 V), pull range (±25 ppm to ±1600 ppm) and package (2520, 3225, 5032, 7050). It provides superior pull range linearity and tuning slope consistency (Kv), 10 times better than quartz VCXOs, which results in a simpler PLL and clock synchronization design. The SiT3809 is 100% compatible with legacy quartz devices in footprint and control voltage and therefore replaces crystal VCXO oscillators without any design changes.

FlexEdgeTM Rise/Fall Time
80 to 220 MHz
Frequency Stability (ppm)
±25, ±50
Operating Temperature Range (°C)
-20 to +70, -40 to +85
Oscillator Type
Output type
Package Type (mm²)
2.5x2.0, 3.2x2.5, 5.0x3.2, 7.0x5.0
Phase Jitter (RMS)
0.5 ps
Pull Range (ppm)
±25, ±50, ±80, ±100, ±150, ±200
Low Jitter, Field Programmable
Voltage Supply (V)
1.8, 2.5, 2.8, 3.3
  • Telecom equipment
  • Wireless base stations
  • Networking and communication gears
  • Networked video systems and digitizers
  • Jitter cleaner
  • Networked audio systems
  • Instrumentation
  • Low-bandwidth analog phase locked loop (PLL)
  • FPGA data recovery


Features & Benefits

Extensive programmability

  • Frequency from 80 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:
  • Customized specification for optimal system performance
  • Readily available products in any specification within the operating range

<1% pull range linearity

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

Superior tuning slope consistency

  • Tighter PLL bandwidth and simpler system design

Four industry-standard packages

  • 100% drop-in replacement for quartz VCXO without any design changes

4 to 6 weeks lead time

  • Reduce inventory overhead
  • Mitigate shortage risks


IBIS Models

LVCMOS IBIS 1.8V SiT3809 (LVCMOS, 1.8 V)
LVCMOS IBIS 2.8V SiT3809 (LVCMOS, 2.8 V)
LVCMOS IBIS 3.3V SiT3809 (LVCMOS, 3.3 V)
LVCMOS IBIS 1.8V SiT3907 (LVCMOS, 1.8 V)

Quality Documents

Additional Resources