Overview

The MK3727H is a low-drive, low-cost, single-output 3.3V Voltage Controlled Crystal Oscillator (VCXO) and PLL clock synthesizer designed to replace expensive VCXOs and crystals. The patented on-chip VCXO accepts a 0V to 3.3V input voltage to cause the output clocks to vary by ±115ppm minimum. Using our analog Phase-Locked Loop (PLL) techniques, the devices use an external, fundamental mode 13.5MHz pullable crystal input to produce output clocks of 27MHz. The drive parameters are optimized for low EMI. The frequency of the on-chip VCXO is adjusted by an external control voltage input into pin VIN. Because VIN is a high-impedance input, it can be driven directly from a PWM RC integrator circuit.

MK3727H - Block Diagram
MK3727H - Pinout
MK3727H - Block Diagram
MK3727H - Pinout
  • Packaged in an 8-pin SOIC
  • Operating voltage of 3.3 V (±5%)
  • Single pullable output clock of 24MHz to 36MHz
  • Uses a fundamental mode 12MHz to 18MHz pullable crystal
  • On-chip patented VCXO with pull range of 230ppm (minimum)
  • VCXO tuning voltage of 0V to 3.3V
  • Low-drive output stage to reduce EMI
  • Advanced, low-power, sub-micron CMOS process
  • RoHS 5 (green) or RoHS 6 (green and lead free) compliant package

Documentation

= Featured Documentation
Type Title Date
Datasheet
MK3727H Datasheet
PDF 233 KB
Application Note
AN-841 Pullable Crystal Selection and VCXO Tuning
PDF 334 KB
Application Note
AN-848 VCXO - Crystal Selection
PDF 222 KB
Application Note
AN-849 Loop Filter Component Selection for VCXO Based PLLs
PDF 218 KB
Application Note
AN-847 VCXO - Absolute Pull Range
PDF 155 KB
5 items

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    MK3727HLF
    circleObsolete
    memory
    view_in_ar
    		SOIC 8 C Yes Tube
    MK3727HLFTR
    circleObsolete
    memory
    view_in_ar
    		SOIC 8 C Yes Reel
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