The MK3720D is a drop-in replacement for the MK3720S and MK3720A devices. Compared to these earlier devices, the MK3720D offers a wider operating frequency range and improved power supply noise rejection. The MK3720 is a low cost, low jitter, high-performance 3.3 volt VCXO and PLL clock synthesizer designed to replace expensive 13.5, 27, or 54 MHz VCXOs. The patented on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3.3 V input voltage to cause the output clocks to vary by ±100 ppm. Using our patented VCXO and analog Phase-Locked Loop (PLL) techniques, the device uses an inexpensive external 13.5 MHz pullable crystal input to produce output clocks of 13.5 MHz, 27 MHz, and 54 MHz. The MK3720D exhibits a moderate VCXO gain of 120 ppm/V typical, when used with a high-quality external pullable quartz crystal. 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.

Features

  • MK3720D is a drop-in upgrade to the earlier MK3720S and MK3720A devices
  • Packaged in 8-pin SOIC
  • Available in Pb (lead) free package
  • Operating voltage 3.3 V (±5%)
  • Output clocks of 54, 27, and 13.5 MHz
  • Uses an inexpensive 13.5 MHz external crystal
  • On-chip patented VCXO with pull range of 200 ppm (minimum)
  • VCXO tuning voltage of 0 to 3.3 V
  • 12 mA output drive capability at TTL levels
  • Advanced, low power, sub-micron CMOS process
  • MK3720D is recommended for new designs

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
MK3720DLF Obsolete DCG8 SOIC 8 C Yes Tube
Availability
MK3720DLFTR Obsolete DCG8 SOIC 8 C Yes Reel
Availability

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
MK3720 Datasheet Datasheet PDF 197 KB
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-841 Pullable Crystal Selection and VCXO Tuning Application Note PDF 334 KB
AN-831 The Crystal Load curve Application Note PDF 395 KB
AN-849 Loop Filter Component Selection for VCXO Based PLLs Application Note PDF 218 KB
AN-848 VCXO - Crystal Selection Application Note PDF 222 KB
AN-847 VCXO - Absolute Pull Range Application Note PDF 155 KB
AN-845 Termination - LVCMOS Application Note PDF 146 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 170 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 442 KB
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 128 KB
AN-839 RMS Phase Jitter Application Note PDF 233 KB
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 115 KB
AN-834 Hot-Swap Recommendations Application Note PDF 153 KB
AN-832 Timing Budget and Accuracy Application Note PDF 131 KB
AN-830 Quartz Crystal Drive Level Application Note PDF 143 KB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 136 KB
AN-800 Approved VCXO Crystals Application Note PDF 150 KB
AN-806 Power Supply Noise Rejection Application Note PDF 438 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
AN-801 Crystal-High Drive Level Application Note PDF 202 KB
Using IDT's Integrated VCXO Products MAN05 Application Note PDF 231 KB
Ferrite Bead Recommendations Application Note PDF 82 KB
PCNs & PDNs
PDN# : CQ-14-08 Manufacturing Discontinunce PDN Product Discontinuation Notice PDF 486 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB

Boards & Kits