Ultra-low jitter programmable oscillator with internal EEPROM

The Texas Instruments LMK61E0 family of ultra-low jitter PLLatinum programmable oscillators utilize fractional-N frequency synthesizers with integrated VCOs to generate commonly used reference clocks. The device supports 3.3V LVCMOS outputs. The device features self startup from on-chip EEPROM to generate a factory programmed default output frequency, or the device registers and EEPROM settings are fully programmable in-system via I2C serial interface. The device provides fine and coarse frequency margining control via I2C serial interface, making it a digitally controlled oscillator (DCXO). The PLL feedback divider can be updated to adjust the output frequency without spikes or glitches in steps of <1ppb using a PFD of 12.5MHz (R divider=4, doubler disabled) for compatibility with xDSL requirements, or in steps of <5.2ppb using a PFD of 100MHz (R divider=1, doubler enabled) for compatibility with broadcast video requirements. The frequency margining features also facilitate system design verification tests (DVT), such as standards compliance and system timing margin testing.