View source for Si5351 Oscillator Breakout Board

[[File:Si5351_001_720px.jpg]]

== Features ==

* 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 ==

[[File:VFO3.PNG]]

=== J1 - Daisy-chained I2C ===

# SCL
# SDA
# +3.3V
# GND

=== J2 - VFO Outputs ===

* VFO out / GND Pairs

# VFO0
# VFO1
# VFO2

== Test Setup ==

=== Test Hardware ===

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

=== Test Software ===

* [https://github.com/land-boards/lb-Arduino-Code/tree/master/LBCards/I2C-VFO3 I2C-VFO3 Arduino Code on GitHub]

== Measurements ==

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

[[File:10MHz_VFO_FFT-01.png]]

== Revision History ==

=== Rev 3 ===

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

=== Rev 2 ===

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

=== Rev 1 ===

* Used crystal

== Assembly Sheet - Rev 3 ==

[[File:I2C-VFO3-CAD-Rev 2_Front_Back.png]]

{| class="wikitable"
! 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 [https://www.mouser.com/ProductDetail/559-FOX924B-27 FOX924B-27]
| U2
| 
| 
| 
| 
|-
| 1
| [https://www.mouser.com/Semiconductors/Clock-Timer-ICs/Clock-Generators-Support-Products/Si5351-Series/_/N-4k38u?P=1y963j3Z1z0z33o&Keyword=Si5351A&FS=True Si5351A]
| U1
| 
| 
| 
| 
|-
|}