1 Features
1• Ultra-low Noise, High Performance
– Jitter: 90 fs RMS Typical Fout > 100 MHz
– PSRR: –70 dBc, Robust Supply Noise
Immunity
• Supported Output Format
– LVPECL up to 1 GHz
– LVDS up to 900 MHz
– HCSL up to 400 MHz
• Total Frequency Tolerance of ± 50 ppm
(LMK61X2) and ± 25 ppm (LMK61X0)
• 3.3-V Operating Voltage
• Industrial Temperature Range (–40ºC to +85ºC)
• 7 mm × 5 mm 6-Pin Package, Pin-Compatible
With Industry Standard 7050 XO Package

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

3 Description
The LMK61XX is an ultra-low jitter oscillator that
generates a commonly used reference clock. The
device is pre-programmed in factory to support any
reference clock frequency; supported output formats
are LVPECL up to 1 GHz, LVDS up to 900 MHz, and
HCSL up to 400 MHz. 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.