PL520-80DC

Clock Generators, PLLs, Frequency Synthesizers Overview

The PL520-80DC is a low phase noise Voltage Controlled Crystal Oscillator (VCXO) IC manufactured by Micrel Inc., now part of Microchip Technology. Designed for fundamental crystal inputs between 19 MHz and 65 MHz, the device features an internal divide-by-two option that extends the output frequency range down to 9.5 MHz. It supports 2.5V or 3.3V power supplies and provides selectable PECL, LVDS, or CMOS outputs with configurable drive strengths. The component integrates variable capacitors and offers programmable enable logic, making it suitable for precision timing applications requiring low jitter and high stability.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Fundamental crystal input range of 19 MHz to 65 MHz with selectable divide-by-two for 9.5 MHz operation
• Selectable output interfaces including PECL, LVDS, and CMOS (High Drive 30mA or Standard Drive 10mA)
• Integrated on-chip varicaps providing a tuning range of approximately 200 ppm and control range of 4–18 pF
• Low phase noise performance with typical RMS period jitter of 2.3 ps at 27 MHz

Clock Generators, PLLs, Frequency Synthesizers Applications

• Precision clock generation in telecommunications equipment
• Frequency synthesis systems requiring low jitter
• Data communication interfaces needing stable VCXO sources
• Test and measurement instrumentation

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the manufacturer lineage as the PL520 series was originally produced by Micrel Inc. before its acquisition by Microchip Technology. Confirm that the DC suffix denotes the die form factor packaged in a waffle pack, which requires specific handling and bonding procedures during assembly. Ensure compatibility with the required operating temperature grade, where 'C' indicates commercial grade availability.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the PL520-80DC when fundamental crystals between 19 MHz and 65 MHz are available. Use the S2 pin configuration to enable the divide-by-two feature if output frequencies below 19 MHz are required. Choose the appropriate output type (PECL, LVDS, or CMOS) based on load requirements and drive strength needs. Ensure the design accounts for the 60 kΩ pull-up resistors on selector pins if default settings are desired without external connections.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the PL520 family of VCXOs designed for low phase noise applications. The PL520-80 variant specifically targets the 19–65 MHz fundamental crystal range. The DC package option refers to the bare die form, distinguishing it from potential packaged variants. This device serves as a critical timing element in systems requiring precise frequency control and low jitter performance.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. Designers should consult Microchip Technology or Micrel sales departments for current equivalent recommendations or updated product line information.