特性
- Fourth Generation FemtoClock® Next Generation (NG) technology
- Footprint compatible with 5mm x 7mm differential oscillators
- One differential LVPECL output pair
- Crystal oscillator interface can also be overdriven by a single-ended reference clock
- Output frequency range: 54MHz -148.5MHz
- Crystal/input frequency: 27MHz, parallel resonant crystal
- VCO range: 2GHz - 2.5GHz
- Cycle-to-cycle jitter: 10ps (maximum), 3.3V±5%
- RMS phase jitter @ 148.5MHz, 12kHz - 20MHz: 0.332ps (typical)
- Full 3.3V or 2.5V operating supply
- -40°C to 85°C ambient operating temperature
- Available in lead-free (RoHS 6) package
描述
The 83PN148I 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 is 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 0.5ps rms phase jitter. The 83PN148I defaults to 148.5MHz using a 27MHz crystal with 2 programming pins floating (pulled down/pulled up with internal pullup or pulldown resistors) but can also be set to 4 different frequency multiplier settings to support a wide variety of applications. The below table shows some of the more common application settings.
