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Texas Instruments LMK04610 Clock Jitter Cleaner

Texas Instruments LMK04610 Clock Jitter Cleaner is a high-performance and low-power jitter cleaner with JESD204B support. The LMK04610 device is very flexible in meeting many application requirements. The typical use case for LMK04610 is a cascaded Dual Loop Jitter Cleaner with optional support for JESD204B. In addition to dual-loop operation, the LMK04610 may be configured for single-loop or clock distribution modes by powering down various blocks.

Features

  • Dual loop PLL architecture
    • 65fs RMS Jitter (10kHz to 20MHz)
    • 85fs RMS Jitter (100Hz to 20MHz)
    • –165dBc/Hz Noise floor at 122.88MHz
  • JESD204B Support
    • Single shot, pulsed, and continuous SYSREF
  • 10 Differential output clocks in 8 frequency groups
    • Programmable output swing between 700mVpp to 1600mVpp
    • Each output pair can be configured to SYSREF clock output
    • 16-Bit channel divider
    • Minimum SYSREF frequency of 25kHz
    • Maximum Output frequency of 2GHz
    • Precision digital delay, dynamically adjustable
      • Digital Delay (DDLY) of ½ × clock distribution path frequency (2GHz maximum)
    • 60ps Step analog delay
    • 50% Duty cycle output divides, 1 to 65535 (even and odd)
  • 2 Reference inputs
    • Holdover mode, when inputs are lost
      Automatic and manual switch-over modes
    • Loss-of-Signal (LOS) detection
  • 0.88W Typical power consumption with 10 outputs active
  • Operates typically from a 1.8V (outputs, inputs) and 3.3V supply (digital, PLL1, PLL2_OSC, PLL2 core)
  • Fully integrated programmable loop filter
  • PLL2
    • PLL2 Phase detector rate up to 250MHz
    • OSCin Frequency-doubler
    • Integrated low-noise VCO
  • Internal power conditioning: better than –80dBc PSRR on VDDO for 122.88MHz differential outputs
  • 3 or 4-Wire SPI interface (4-wire is default)
  • –40ºC to +85ºC Industrial ambient temperature
  • Supports 105ºC PCB temperature (measured at thermal pad)
  • LMK04610: 8mm × 8mm VQFN-56 Package with 0.5mm pitch

Applications

  • Wireless infrastructure like LTE-BTS, small cells, Remote Radio Units (RRU)
  • Data converter and integrated transceiver clocking
  • Networking, SONET/SDH, DSLAM
  • Test and measurement

Simplified Schematic

Schematic - Texas Instruments LMK04610 Clock Jitter Cleaner
Published: 2017-08-29 | Updated: 2022-05-04