Microchip logo
  • All
  • Products
  • Documents
  • Applications Notes
product primary image

SY89421V

Status: Not Recommended for new designs

Features:

  • 3.3V and 5V power supply options
  • 1.12GHz maximum VCO frequency
  • 30MHz to 560MHz reference input operating frequency
  • External 2.0GHz VCO capability
  • Low jitter differential design
  • PECL differential outputs
  • Frequency doubler mode
  • External loop filter optimizes performance/cost
  • Available in 20-pin SOIC package
View More
Overview
Documents
Development Environment
RoHS Information
Buy Now

Device Overview

Summary

The SY89421V is a digital Phase Locked Loop based on Micrel-Synergy's differential PLL technology. It is capable of operating in the 30MHz to 560MHz reference input frequency range, and up to 2000MHz with the HFIN input and an external VCO. Use of a phase-frequency detector results in excellent PLL locking and tracking characteristics. Error correction voltages are generated by the detector if either phase or frequency deviations occur. The VCO has a frequency range covering more than a 2:1 ratio from 480MHz to 1120MHz.

Feedback for the loop is realized by connecting FOUT, FOUT to FIN, FIN by means of external circuitry. This allows the flexibility of inserting additional circuitry off-chip in the feedback paths, such as an additional divider and/or buffer. Pulldown resistors are required for the FOUT and FOUT pins. High frequency inputs HFIN, HFIN and corresponding outputs HFOUT, HFOUT are featured for use with external components such as an active loop filter and a high frequency VCO.

Select pins S1 and S2 are used to program the N divider for optimum VCO operation, in other words with the VCO in the center of its range. Select pin S3 allows bypassing the N divider enabling the PLL to output the VCO directly. Select pin S4 is used to select off-chip or on-chip VCO. Select pin S5 enables the divide-by-two prescaler, which is useful in frequency doubling applications. All Select pins are TTL compatible.

Additional Features
    • 3.3V and 5V power supply options
    • 1.12GHz maximum VCO frequency
    • 30MHz to 560MHz reference input operating frequency
    • External 2.0GHz VCO capability
    • Low jitter differential design
    • PECL differential outputs
    • Frequency doubler mode
    • External loop filter optimizes performance/cost
    • Available in 20-pin SOIC package
Parametrics
Name
Value
Product Type
Clock Synthesizers
Input Frequency (MHz) Crystal
26.5625
PDB
False
OE
True
FSEL
True
CSEL
False
CLK
False
Ultra Low Power
False
Output Frequency Min. (MHz)
106.25/212.5

Documents

Jump to:

Data Sheets

11/11/2015
67KB

Development tools data is currently unavailable.


Rohs data is currently unavailable.

Buy from the Microchip Store

Grid
View
Table
View
Filter:
Apply
Clear
Only show products with samples
Product
Leads
Package Type
Temp Range
Packing Media
5K Pricing
Buy