Mark,
Here is info from the data sheet, seems it will do
exactly what
Your wanting to do.
73's
KQ4TQ
A handy way to use the Si5351A clock generator IC
in your RF and microcontroller projects.
The Silicon Labs Si5351A is a fantastic clock
generator IC with some features that you won't see
anywhere else. It can generate three independent
output signals between 8 kHz and 160 MHz (there
are some limitations, see Constraints below),
using only a simple 25 MHz crystal reference
oscillator. Each output can be independently
tuned, switched on or off, and have a variable
drive level selected. Using an Arduino and a
library provided by us, you may control almost
every parameter of the IC. The Si5351A is very
useful in a variety of applications, such as
wide-range VFOs (and can also simultaneously
provide a BFO signal), handy signal source, beacon
transmitter, or any other project where a stable
and tuneable signal is needed.
The Etherkit Si5351A Breakout Board makes it
convenient to use the Si5351A with your Arduino or
other favorite microcontroller. While the Si5351A
is a +3.3 V IC, our board provides a low-dropout
voltage regulator and level conversion circuitry
so that it can be used with either 3.3 V or 5 V
controllers. The three outputs are brougt out to
pads which accept SMA female end launch connectors
(sold separately) and also to 0.1" headers. You
may choose a standard 25 MHz crystal reference
oscillator, or an optional high-stability 25 MHz
TCXO reference oscillator.
Specifications
.All SMT components assembled, 0.1" headers
included separately
.Fully tested
.Output frequency range: 8 kHz to 160 MHz (see
Constraints below)
.Number of outputs: 3
.Output impedance: 50 Ω
.Output drive levels: 2 mA, 4 mA, 6 mA, 8 mA (into
50 Ω)
.Power supply: +3.3 V or +5 V
.Interface: I2C (on a 0.1" header)
.Output jacks: 0.1" header or optional SMA female
end launch
.PCB material: high quality 1.6 mm double-sided
FR4 with soldermask and ENIG coating
.PCB dimensions: 30 mm x 50 mm
.RoHS Compliant
Constraints
Two multisynths cannot share a PLL with when both
outputs are < 1.024 MHz or >= 112.5 MHz. This
means that you may only have two outputs under
those conditions.
Documentation
Schematics
You will find all of the official documentation at
the Etherkit Documentation Wiki.
-----Original Message-----
From: minima-bounce@xxxxxxxxxxxxx
[mailto:minima-bounce@xxxxxxxxxxxxx] On Behalf Of
Mark Smith (Redacted sender "smittyhalibut" for
DMARC)
Sent: Saturday, July 02, 2016 5:10 PM
To: minima@xxxxxxxxxxxxx
Subject: [minima] Si5351 instead of Si570?
I have several Si5351 boards already and was
thinking of using one as both the VFO and the
20MHz LO. I'm new to hacking on RF design like
this, so forgive me if this is a stupid question,
but is there a reason not to do this? I could
control the USB vs LSB frequency shift in
software, and could even implement an IF Shift
feature for a little bit of filter control.
Second potentially stupid question: can I use the
first stage RF -> IF mixer design as the second IF
-> Audio mixer too? I'm laying out the sections as
individual boards to be fabbed by OSH Park, and
would love to just reuse a section if possible.
Thanks for your help!
-Mark
