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High Quality PLL Frequency Synthesizer Develpment Board for Electronics DIY.
Well designed and crafted from quality circuit board with exquisite workmanship. This frequency synthesizer board is the combination of neat layout and stable performance. Ideal for ham radio hobbyists or school, science education.
Specifications:
Output frequency range: 137M-4.4GHz
Supply voltage: 4-9V (5VDC)
Output :
2.2GHZ--4.4GHz sine (fundamental)
137MHZ--2.2GHz squarewave (fundamental division)
Output : wideband output, strength: + 5dBm (programmable)
RF connector: SMA female head
Control Interface: Three-wire Serial Peripheral Interface Bus
Reference Clock: 10.000MHZ (default), through the interface to an external SMA
Weight: 16g
Connection:
The module can pin microcontroller LCD1602 / LCD12864 module connection (can be plugged directly Backward), convenient software debugging, both lock indicator (Lock). Pin correspond to the following:
GND ------------------------- GND
VDD (5V) ------------------- VCC
VO -------------------------- NC (empty)
RS -------------------------- NC (empty)
R / W ------------------------- MUXOUT
EN -------------------------- CLK
DB0 ------------------------- DATA
DB1 ------------------------- LE
DB2 ------------------------- CE (has 10K pullup)
DB3 ------------------------- GND (do not take)
Reference Clock:
10.000MHZ default reference clock is active clock or an external reference clock , you need to modify the three-way connection with a soldering iron, connect EXT_REF external reference .
Package Included:
1 x RF Source Frequency Synthesizer
John McNelly
Reviewed in the United States on January 14, 2025
Wasn't able to get PLL lock after quite a number of hours trying everything I could think of. Swapped for an ADF4351 dev board and got lock and good RF output immediately with the same code (changed one value since the AD4351 dev board has a 25MHz oscillator instead of a 10MHz oscillator). Not sure what is wonky but the dodgy soldering on the back of the IC certainly doesn't help.
Customer
Reviewed in the United States on April 4, 2024
I spent hours with this board, poring over the datasheet for the ADF4350, calculating register values, and trying lots of different settings. I also grabbed Analog Devices' ADF435x software, which provides a GUI for configuring the registers, with sanity checks and error messages. Nothing worked -- it would always stabilize at one frequency, which was never the one I specified.Finally, in frustration I ordered one of the ADF4351 boards on Amazon from another listing. That one worked immediately, with a beautiful, stable signal. The differences between the ADF4350 and ADF4351 are relatively minor, unless you care about one of the key differences, and generally the *1 is just an improvement.Are all of the green ADF4350 boards bad? Does mine just have a bad chip? Don't know! But there are no schematics, no successful projects I can find on YouTube using this board, etc. Whereas the ADF4351s actually show up a bit around the Internet. For me, this board is just not worth it unless the manufacturer wants to step up and provide some guarantees and documentation. I imagine they work *sometimes*, but I wouldn't suggest taking the risk.
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