General Description

The 83PN15639 is a programmable LVPECL synthesizer that is “forward” footprint compatible with standard 5mm x 7mm oscillators.

The device uses IDT’s fourth generation FemtoClock® NG technology for an optimum of high clock frequency and low phase noise performance. Forward footprint compatibility means that a board

designed to accommodate the crystal oscillator interface and the optional control pins are also fully compatible with a canned oscillator

footprint - the canned oscillator will drop onto the 10-VFQFN footprint for second sourcing purposes. This capability provides designers with programability and lead time advantages of silicon/crystal

based solutions while maintaining compatibility with industry standard 5mm x 7mm oscillator footprints for ease of supply chain management. Oscillator-level performance is maintained with IDT’s 4th

Generation FemtoClock® NG PLL technology, which delivers sub

0.2ps RMS phase jitter.

The 83PN15639 defaults to 156.25MHz using a 25MHz crystal but

can also be set to one of four different frequency multiplier settings

to support a wide variety of applications. The table below shows

some of the more common application settings.

Features

• Fourth Generation FemtoClock® NG technology

• Footprint compatible with 5mm x 7mm differential oscillators

• One differential LVPECL output pair

• Crystal oscillator interface which can also be overdriven using a

single-ended reference clock

• Output frequency: 100MHz - 156.25390625MHz

• Crystal/input frequency: 25MHz, 12pF parallel resonant crystal

• VCO range: 2GHz – 2.5GHz

• RMS phase jitter @ 156.25MHz, 10kHz – 1MHz: 0.179ps (typical)

• Full 3.3V or 2.5V operating supply

• -40°C to 85°C ambient operating temperature

• Lead-free (RoHS 6) packaging