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Texas Instruments LMK0480x Low-Noise Clock Jitter Cleaner

Texas Instruments LMK0480x Low-Noise Clock Jitter Cleaner is a high-performance clock conditioner that includes superior clock jitter cleaning, generation, and distribution with advanced features to meet next-generation system requirements. The dual loop PLLatinum™ architecture enables 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) provides a low-noise jitter cleaner function. The 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 up to 155MHz
    • OSCin frequency-doubler
    • Integrated low-noise VCO
  • 2 Redundant input clocks with LOS
    • Automatic and manual switch-over modes
  • 50% Duty cycle output divides, 1 to 1045 (even and odd)
  • 12 LVPECL, LVDS, or LVCMOS programmable outputs
  • Digital delay: fixed or dynamically adjustable
  • 25ps Step analog delay control
  • 14 Differential outputs with up to 26 single-ended
    • Up to 6 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 to 85°C Industrial temperature range
  • 3.15V to 3.45V Operation
  • 2 Dedicated buffered/divided OSCin clocks
  • 64-Pin WQFN (9.0mm × 9.0mm × 0.8mm) package

Applications

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

Associated Product

Texas Instruments LMK0480x Low-Noise Clock Jitter Cleaner

Provides superior clock jitter cleaning, generation, and distribution with advanced features.

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Simplified Schematic

Texas Instruments LMK0480x Low-Noise Clock Jitter Cleaner
Pubblicato: 2015-12-14 | Aggiornato: 2024-01-15