1Khz to 20Mhz Low Power Oscillator

  • Rajkumar Sharma
  • 1273
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  • easy
  • Tested

This is a precision, low power oscillator that occupies very little space.  The oscillator frequency is adjustable using an onboard multi-turn trimmer potentiometer. The output of the circuit is very accurate and has a 1.5% frequency error. The project operates with a single 5V power supply and provides a rail-to-rail, 50% duty cycle square wave output. The CMOS output driver of the chip ensures fast rise/fall times and rail-to-rail switching. A multi-turn trimmer provided to adjust the master oscillator frequency between 1Khz to 20Mhz. Jumper provided for the three-state DIV input which determines the master clock is divided by 1, 10,100 before the output, providing three frequency ranges spanning 1Khz to 20Mhz. The output of the project can drive 5 KΩ and/or 10pF loads. The output of the project is limited to 50mA.

Jumper/Sunt J1 Settings

  • J1 Connected to VCC = Frequency Output 1Khz to 200Khz (Set PR1)
  • Jumper J1 Open = Frequency output 10Khz to 2Mhz (Set PR1)
  • Jumper J1 GND= Frequency Output 100Kz to 20Mhz (Set PR1)
Note: Use a shielded high quality wire on output for high frequency output.

Features

  • Operating Power Supply 5V DC (8mA)
  • Multi-turn trimmer to set the frequency
  • Output Current 50mA Maximum
  • Jumper J1, Master Frequency Divider, 1, 10, 100
  • Jumper J1 GND =N1, VCC=N100, Jumper Open N=10
  • Output Frequency 1Khz to 20Mhz
  • Frequency Error ≤1.5% Max, 5kHz to 10MHz
  • 50% ±1% Duty Cycle 1kHz to 2MHz
  • 50% ±5% Duty Cycle 2MHz to 10MHz
  • Fast Start-Up Time: 50μs to 1.5ms
  • PCB Dimensions 27.31 x 13.18mm

Schematic

Parts List

SR.QNTY.REF.DESC.VENDOR/DIGIKEY/MOUSER
11CN14 PIN MALE HEADER 2.54MM PITCHDIGIKEY S1011EC-40-ND
21C110uF/16V SMD SIZE 1206DIGIKEY 399-5091-1-ND
31C20.1uF/50V SMD SIZE 0805YAGEO
41D1LED RED SMD SIZE 0805DIGIKEY 475-1415-1-ND
51J1JUMPER 3P/ SHUNTDIGIKEY S9001-ND
61PR12M MULI-TURN POTDIGIKEY 3296W-205LF-ND
71R110K 5% SMD SIZE 0805YAGEO
82R2,R4DNPOMIT
91R31K 5% SMD SIZE 0805YAGEO
101U1LTC6900DIGIKEY LTC6900CS5#TRMPBFCT-ND

Connections



Gerber View

Photos

Video

LTC6900 Datasheet

6900fa

PCB

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