Bumalik sa Texas Instruments

Texas Instruments LMK04208 Ultra Low Noise Clock Jitter Cleaner

Texas Instruments LMK04208 Ultra-Low Noise Clock Jitter Cleaner is a high-performance clock conditioner with superior clock jitter cleaning, generation, and distribution. This device includes advanced features to meet next-generation system requirements. The dual loop PLLatinum™ architecture is capable of 111fs, RMS jitter (12kHz to 20MHz) using a low-noise VCXO module or sub-200fs rms jitter (12kHz to 20MHz) using a low-cost external crystal and varactor diode. The dual loop architecture consists of two high-performance phase-locked loops (PLL), a low-noise crystal oscillator circuit, and a high-performance voltage-controlled oscillator (VCO). The first PLL (PLL1) of the Texas Instruments LMK04208 provides low-noise jitter cleaner functionality, while the second PLL (PLL2) performs the clock generation.

Features

  • Ultra-low RMS jitter performance
    • 111fs, RMS jitter (12kHz to 20MHz)
    • 123fs, RMS jitter (100Hz to 20MHz)
  • Dual loop PLLatinum™ PLL architecture
  • PLL1:
    • Integrated low-noise crystal oscillator circuit
    • Holdover mode when input clocks are lost
    • Automatic or manual triggering/recovery
  • PLL2:
    • Normalized PLL noise floor of –227dBc/Hz
    • Phase detector rate of up to 155MHz
    • OSCin frequency-doubler
    • Integrated low-noise VCO or external VCO mode
  • Two redundant input clocks with LOS
    • Automatic and manual switch-over modes
  • 50% duty cycle output divides, 1 to 1045 (even and odd)
  • Six LVPECL, LVDS, or LVCMOS programmable outputs
  • Digital delay (fixed or dynamically adjustable)
  • 25ps step analog delay control
  • Seven differential outputs, up to 14 single-ended
    • Up to six VCXO/crystal buffered outputs
  • Clock rates of up to 1536MHz
  • 0-delay mode
  • Three default clock outputs at power-up
  • Multi-mode: dual PLL, single PLL, and clock distribution
  • –40°C to +85°C industrial temperature range 
  • 3.15V to 3.45V operation
  • 64-Pin WQFN package (9mm × 9mm × 0.8mm)

Applications

  • Data converter clocking
  • Wireless infrastructure
  • Networking, SONET/SDH, DSLAM
  • Medical, video, military, and aerospace
  • Test and measurement

Software

Simplified Schematic

Schematic - Texas Instruments LMK04208 Ultra Low Noise Clock Jitter Cleaner

Associated Development Tool

Texas Instruments LMK04208EVM Clock Jitter Cleaner EVM

Allows for the evaluation of the LMK04208 with test equipment or other evaluation boards. 

Learn Moretungkol sa Texas Instruments LMK04208EVM Clock Jitter Cleaner EVM View Productskaugnay ng Texas Instruments LMK04208EVM Clock Jitter Cleaner EVM
Inilathala: 2016-10-27 | Na-update: 2022-03-11