Low Jitter, Quad PLL, 11-output Clock Generator


The SiT95211 offers programmable quad fractional frequency generation and translation with flexible input to output frequency translation options. Ultra high jitter performance DPLL supports up to 4 differential or single-ended input clocks that are common for all the 4 fractional PLLs and provides 12 differential output clocks. The clock outputs can be derived from any of the 4 PLLs in a fully flexible manner. This device is fully programmable with the I2C/SPI interface or an on-chip one-time programmable non-volatile memory for factory pre-programmed devices. 

  • Lower phase noise minimizes bit error rate and increases design margin in 56G/112G PAM4 I/O systems
  • Better signal integrity increases design margin and leads to faster time to market
  • Higher clock tree integration reduces system BOM and increases overall reliability

64-pin 9x9 mm QFN Network Synchronizers - Jitter Cleaners package
"Specs" "Value"
Operating Temperature Range (°C) -40 to 85
Package Type (mm²) 9x9 mm, 64-pin QFN
Number of Inputs 4
Number of Outputs 12
Input Frequency Range 200 kHz to 2.1 GHz (Differential)
Output Frequency Range 0.5 Hz to 2.94912 GHz (Differential)
Number of PLL/Clock Domains 4 PLL
Phase Jitter (rms) 85 fs typ.; 70 fs typ. (with MEMS oscillator)
Repeatable Input-Output Delay ±225 ps
Frequency Control DCO 0.001 ppt (all outputs)
Phase Control DCO <1 ps (all outputs)
Internal ZDB Mode <0.5 ns Input to Output delay variation
Programmability NVM OTP, External EEPROM, Partial autonomous, SPI/I2C
Features Independent output supply pins: 3.3 V, 2.5 V, or 1.8 V
Availability Production
  • Best-in-class 85 fs / 70 fs integrated jitter for quad PLL
  • JESD204B/C support for data converter clocks
  • External EEPROM support and on-chip OTP
  • Frequency DCO (0.001 ppt) and phase control DCOs (< 1 ps resolution)
  • Internal ZDB on all PLLs with < ±500 ps input to output delay across temp
  • Independent VDDO (3.3 / 2.5 / 1.8 V)
  • Outputs can be phase aligned on independent sync pulse
SiT95211 Functional Overview
  • Ethernet
  • Optical Transport Network (OTN) Clocking for Framers, Mappers & Processors
  • Microwave Backhaul
  • 100G / 200G / 400G / 800G Ethernet
  • Wireless Networks
  • Small Cells
  • Storage, Servers & Datacenters
  • SONET/SDH Stratum 3
  • Test & Measurement
  • Broadcast Video
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