In-System Programmable

SiTime’s in-system programmable oscillators enable designers to adjust output frequencies in real time via digital interfaces. With these devices, customers can streamline supply chain management and reduce inventory overhead by standardizing on a single programmable clock component for all their frequency needs. These devices also enhance system robustness by eliminating any sensitivity to board noise.

I2C/SPI Oscillators

SiTime's Elite Platform™ I2C/SPI oscillators enable users to program output frequency and pull frequency in-system using a digital interface, offering designers great flexibility. This family offers ultra-low jitter and utilizes SiTime’s unique DualMEMS™ temperature sensing and TurboCompensation™ technology to deliver exceptional dynamic performance.

  • Ideal for replacing multiple timing components in systems that support multiple frequencies such as telecom, networking, server, storage, broadcasting, test and measurement equipment 
  • Any-frequency mode for programming output frequency via I2C or SPI from 1 MHz to 725 MHz
  • Digitally controlled oscillator (DCO) mode for pulling/tuning frequency up to ±3200 ppm via I2C or SPI with 0.005 ppb resolution
  • Any combination of frequencies (1 MHz to 725 MHz), voltage (2.5 V to 3.3 V), pull range (±25 ppm to ±3200 ppm), and three DE output formats (LVPECL, LVDS, or HCSL)
  • 0.21 ps typical integrated phase jitter
Device Datasheet Frequency Stability(PPM) Output Type Supply Voltage(V) Temp. Range(°C) Package Size(mm2)
SiT3521 1 to 340 MHz ±20 ±25 ±50 LVPECL LVDS HCSL 2.5 to 3.3 -20 to +70 -40 to +85 5.0 x 3.2 10-pin
SiT3522 340.000001 to 725 MHz ±20 ±25 ±50 LVPECL LVDS HCSL 2.5 to 3.3 -20 to +70 -40 to +85 5.0 x 3.2 10-pin

Digitally Controlled Oscillators

SiTime's digitally controlled MEMS oscillators (DCXO) enables users to tune output frequency by up to ±1600 ppm via a one-wire digital interface. This eliminates the need for an external DAC used in traditional VCXO designs. It also eliminates the frequency shift caused by board noise on the voltage control line.

  • Widest pull range options, including ±25, ±50, ±100, ±150, ±200, ±400, ±800, or ±1600 ppm
  • Pull range resolution of 1 ppb
  • Any combination of frequencies (up to 625 MHz), voltage (1.8 V; 2.5 V to 3.3 V), pull range (±25 ppm to ±1600 ppm) and industry-standard packages (3225, 5032, or 7050)
  • LVCMOS outputs (SiT3907) and differential outputs (SiT3921 and SiT3922)
Device Datasheet Frequency Stability(PPM) Output Type Supply Voltage(V) Temp. Range(°C) Package Size(mm2)
SiT3907 1 to 220 MHz ±10 ±25 ±50 LVCMOS 1.8 2.5 2.8 3.3 -20 to +70 -40 to +85 3.2x2.5 5.0x3.2 7.0x5.0
SiT3921 1 to 220 MHz ±10 ±25 ±50 LVPECL LVDS 2.5 3.3 -20 to +70 -40 to +85 3.2x2.5 5.0x3.2 7.0x5.0
SiT3922 220 to 625 MHz ±10 ±25 ±50 LVPECL LVDS 2.5 3.3 -20 to +70 -40 to +85 3.2x2.5 5.0x3.2 7.0x5.0