Low Jitter, 10-output MEMS Jitter Cleaner


The SiT95145 is a single-chip MEMS jitter cleaner that provides the highest level of clock tree integration and consolidates multiple clock ICs and oscillators into a single device. Its low noise quad-PLL architecture and programmable output drivers provide up to 10 differential or 20 LVCMOS low-jitter clock outputs. It supports 4 additional clock inputs with Frac-N dividers, enabling virtually any input-to-output frequency translation configurations from 8 kHz to 2.1 GHz.

This jitter cleaner integrates SiTime’s third-generation MEMS resonator. This integrated MEMS approach eliminates the dependency on a crystal reference, along with all quartz related issues. It enables a true clock-system-on-a-chip that improves system robustness:

  • Always-accurate clock synthesis by eliminating crystal capacitive mismatch
  • Always-reliable startup even at cold temperature and other harsh environmental conditions
  • No jitter degradation due to noise coupling onto a crystal interface
  • No activity dips/frequency jumps inherent to quartz
  • 10x more resistant to vibration and board bending

The SiT95145 is supported by TimeMaster™ software to simplify clock tree design. The device can also be shipped with a user-specified, factory pre-programmed default startup configuration. The device configuration can be re-programmed twice using two banks of one-time-programmable (OTP) memory during manufacturing or configured in-system via I2C/SPI for additional BOM flexibility. The SiT95145 is also supported with the SiT6503EB evaluation board.

Single-chip MEMS jitter cleaner consolidates MEMS resonator, multiple clock ICs and oscillators into a single  9 x 9 mm 64-pin device
"Specs" "Value"
Number of Inputs 4
Number of Outputs 10
Input Frequency Range 8 kHz to 2.1 GHz (differential), 8 kHz to 250 MHz (LVCMOS
Output Frequency Range 8 kHz to 2.1 GHz (differential), 8 kHz to 250 MHz (LVCMOS), 1 PPS (one output only)
Number of PLL/Clock Domains 4 PLL, 1 time domain
Operating Temperature Range (°C) -40 to +85
Phase Jitter (rms) 120 fs
Voltage Supply (V) 1.8, 2.5, 3.3
Operating Mode Free running, synchronized, holdover
Package Type (mm²) 9x9 mm, 64-pin
Features Hitless switching, zero-delay buffer mode, DCO with 50-ppt resolution, programmable output delay control
Availability Production

Clock-system-on-a-chip with integrated MEMS, simplifies designs

  • No crystal capacity matching issues, always-accurate frequency synthesis
  • No noise coupling onto crystal circuits, guaranteed jitter
  • Resistant to vibration and board bending, anywhere PCB placement

Flexible features for the highest level of clock consolidation

  • 4 inputs, 10 outputs, 4 PLLs, up to 2.1 GHz output frequency for flexible frequency translation
  • Individually configurable output types and voltage to support a wide range of processor and SOCs
  • Programmable loop bandwidth (1 mHz to 4 kHz)

35% space saving ideal for high density designs

  • 9 x 9 mm package, no external XTAL/oscillator required

Semiconductor level quality and reliability, eliminating quartz related issues associated with traditional clocks

  • Low Jitter Clock Frequency Translation & Generation
  • Clock Tree Consolidation Replacing Crystal Oscillators (XOs) & Buffers
  • 10G / 100G / 400G Ethernet Clocking
  • Synchronous Ethernet (G.8262, options 1 and 2)
  • Optical Transport Network (OTN) Clocking for Framers, Mappers & Processors
  • FPGA, Processor & Memory Clocking
  • Storage, Servers & Datacenters
  • 测量与测试
  • Broadcast Video

SiT6503EB Evaluation Board User Manual

TimeMaster for Clocks Software -- Simplifes clock tree design (Contact SiTime)

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