LMK61E2 Ultra-Low Jitter Programmable Oscillator

By Texas Instruments 121

LMK61E2 Ultra-Low Jitter Programmable Oscillator

Texas Instruments' LMK61E2 is an ultra-low jitter PLLatinum™ programmable oscillator with a fractional-N frequency synthesizer with integrated VCO that generates commonly used reference clocks. The outputs can be configured as LVPECL, LVDS, or HCSL.

The device features self-startup from on-chip EEPROM that is factory programmed to generate 156.25 MHz LVPECL output. The device registers and EEPROM settings are fully programmable in-system via I2C serial interface. Internal power conditioning provide excellent power supply ripple rejection (PSRR), reducing the cost and complexity of the power delivery network. The device operates from a single 3.3 V ±5% supply. The device provides fine and coarse frequency margining options via I2C serial interface to support system design verification tests (DVT), such as standard compliance and system timing margin testing.

  • Ultra-low noise, high performance
    • Jitter: 90 fs RMS typical fOUT > 100 MHz
    • PSRR: -70 dBc, robust supply noise immunity
  • Flexible output format; user selectable
    • LVPECL up to 1 GHz
    • LVDS up to 900 MHz
    • HCSL up to 400 MHz
  • Total frequency tolerance of ±50 ppm
  • System level features
    • Frequency margining: fine and coarse
    • Internal EEPROM: user configurable default settings
  • Other features
    • Device control: I2C
    • 3.3 V operating voltage
    • Industrial temperature range (-40°C to 85°C)
    • 7 mm × 5 mm 6- or 8-pin package
  • High-performance replacement for crystal-, SAW-, or silicon-based oscillators
  • Switches, routers, network line cards, base band units (BBU), servers, storage/SAN
  • Test and measurement
  • Medical imaging
  • FPGA, processor attach