PL502-37QC-R

Clock Generators, PLLs, Frequency Synthesizers Overview

The PL502-37QC-R is a low phase noise multiplier Voltage Controlled Crystal Oscillator (VCXO) manufactured by Micrel Inc. It operates on a single 3.3V supply and accepts fundamental parallel resonant mode crystals between 12MHz and 25MHz. The device multiplies the input frequency up to 32x, generating output frequencies from 750kHz to 800MHz with an LVCMOS interface. It features selectable frequency dividers/multipliers (/16 to x32), a wide pull range of ±200ppm, and integrated varicaps eliminating external load capacitors.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates output frequencies from 750kHz to 800MHz using internal PLL multiplication
• Provides low phase noise performance, reaching -142dBc/Hz at 10kHz offset for 19.44MHz
• Features LVCMOS output compatible with standard logic levels
• Includes selectable frequency divider/multiplier options ranging from /16 to x32

Clock Generators, PLLs, Frequency Synthesizers Applications

• SONET/SDH network synchronization equipment
• Forward Error Correction (FEC) systems
• Clock generation in high-speed digital communication interfaces

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify that the component originates from Micrel Inc., as Microchip Technology acquired Micrel. Confirm the package type matches the 'Q' suffix (16-pin QFN) and the temperature grade corresponds to the 'C' suffix (Commercial). Ensure the ordering suffix includes '-R' for tape and reel packaging if required by assembly processes.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when LVCMOS output compatibility is required alongside VCXO tuning capabilities. Compare against PL502-35 or PL502-38 if LVPECL outputs are preferred, or PL502-39 for LVDS signaling. Verify crystal specifications match the 9.5pF loading rating and ESR requirements to ensure proper pullability and frequency accuracy.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the PL502 family of universal low phase noise ICs. The PL502-37 variant specifically designates the LVCMOS output configuration within the series, which also includes LVPECL (PL502-35, PL502-38) and LVDS (PL502-39) options. All variants share identical electrical characteristics except for the output driver stage.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other members of the PL502 family such as PL502-35, PL502-38, or PL502-39, provided the system can accommodate LVPECL or LVDS signaling differences. Cross-vendor equivalents require matching phase noise, pull range, and operating voltage specifications.