1 Features

1• Ultra-Low Noise, High Performance

– Jitter: 500-fs RMS Typical fOUT > 50 MHz on

LMK61E0M

• LMK61E0M Supports 3.3-V LVCMOS Output up

to 200 MHz

• Total Frequency Tolerance of ±25 ppm

• System Level Features

– Glitch-Less Frequency Margining: Up to ±1000

ppm From Nominal

– Internal EEPROM: User Configurable Start-Up

Settings

• Other Features

– Device Control: Fast Mode I2C up to 1000 kHz

– 3.3-V Operating Voltage

– Industrial Temperature Range (–40ºC to

+85ºC)

– 7-mm × 5-mm 8-Pin Package

• Default Frequency: 70.656 MHz

2 Applications

• 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

• xDSL, Broadcast Video

3 Description

The LMK61E0 family of ultra-low jitter PLLatinumTM

programmable oscillators use fractional-N frequency

synthesizers with integrated VCOs to generate

commonly used reference clocks. The LMK61E0M

supports 3.3-V LVCMOS outputs. The device

features self start-up from on-chip EEPROM to

generate a factory programmed default output

frequency, or the device registers and EEPROM

settings are fully programmable in-system through I2C

serial interface. The device provides fine and coarse

frequency margining control through 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 12.5 MHz (R

divider=4, doubler disabled) for compatibility with

xDSL requirements, or in steps of <5.2 ppb using a

PFD of 100 MHz (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.