Si5351 Oscillator Breakout Board

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Si5351 001 720px.jpg

Features[edit]

  • I2C Daisy-chain connector
  • 3 outputs
  • 25 or 27 MHz crystal (Rev 1)
  • 27 MHz TCXO (Rev 3)
  • Can be used as a heat shrinked assembly with cables

Pinout[edit]

VFO3.PNG

J1 - Daisy-chained I2C[edit]

  1. SCL
  2. SDA
  3. +3.3V
  4. GND

J2 - VFO Outputs[edit]

  • VFO out / GND Pairs
  1. VFO0
  2. VFO1
  3. VFO2

Test Setup[edit]

Test Hardware[edit]

  • Arduino Pro Mini
    • 3.3V/8MHz
  • Rotary Encoder/Breakout Board
  • 128x32 OLED
  • Breadboard Power Supply
    • 3.3V operation

Test Software[edit]

Measurements[edit]

  • 10 MHz FFT
    • Square wave has high odd harmonic content

10MHz VFO FFT-01.png

Revision History[edit]

Rev 3[edit]

  • TXCO
  • Fixed solder mask clearance
  • Tested
    • Correction factor less than +10 Hz at 10 MHz
      • 1ppm (spec 2.5ppm)

Rev 2[edit]

  • TXCO instead of crystal
  • Insufficient solder mask (too big a clearance)

Rev 1[edit]

  • Used crystal

Assembly Sheet - Rev 3[edit]

I2C-VFO3-CAD-Rev 2 Front Back.png

Qty Value RefDes Qty Value RefDes
2 0.1uF C1,C2 1 Header, Right Angle, 2x3 J2
2 2.2K R1,R2 1 Header, Right Angle, 2x4 J1
1 TCXO, 27 MHz FOX924B-27 U2
1 Si5351A U1