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
器件 产品说明书 频率 精度(PPM) 输出类型 供电电压(V) 温度范围(°C) 封装尺寸(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

数控 VCXO

SiTime的数控MEMS振荡器(DCXO)能帮助用户通过单线数字接口对输出频率进行微调,牵引范围高达±1600ppm,从而无需在传统的VCXO设计中使用外部DAC。此外,其还可消除在电压控制线路上由电路板噪声引起的频移。

  • 业界最宽泛的拉动范围选项,包括±25±50±100±150±200±400±800±1600ppm
  • 1ppb的拉动范围分辨率
  • 任意组合的频率(高达625MHz)、电压(1.8V2.5V3.3V)、拉动范围(±25ppm±1600ppm)以及业界标准封装(322550327050
  • LVCMOS输出(SiT3907)与差动输出(SiT3921SiT3922
器件 产品说明书 频率 精度(PPM) 输出类型 供电电压(V) 温度范围(°C) 封装尺寸(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