Hi Dave, I didn't realize the Elektor May-2007 SDR used the CY27EE16. I'll have another look at the article.
I need to compare the instruction sets for the CY27EE16 and the newer CY22393 to see if they overlap. If they do, then the software that works with the Elektor SDR receiver should work with the Peppermint board. It turns out if you go to the Files>DJ9CS folder on this Group, there's a spectral comparison at 28MHz of the CY27EE16, a crystal, and the DDS60 from www.amqrp.org. The DDS60 uses the AD9851. The CY27EE16 is clean as a whistle, albeit with a higher noise floor compared to the crystal. The AD9851 is full of spurs. There's no explanation how the measurement was done, but it looks like he used one of those USB VNA's from Italy. Thanks, David --- In [email protected], "Dave Wade" <[EMAIL PROTECTED]> wrote: > > The Elektor USB Controller genberal coverage SDR uses the CY27EE16 running at 4x rx frequency. You can download the article for free from :- > > http://www.elektor.com/magazines/2007/may/software-defined-radio.91527.lynkx > > It uses the FT232R to get from USB into the chip. A number of the Softradio programs including G8JCF and WinRadio will drive this board. I just wonder if the Analog DDS chips such as the AD9851 might not be as good a solution, but again no USB on these... > > Dave G4UGM > Illegitimi Non Carborundum > > ----- Original Message ----- > From: drmail377 > To: [email protected] > Sent: Wednesday, February 27, 2008 6:18 AM > Subject: [soft_radio] Cypress Programmable Clock Generators (PCG's) - Options? > > > Hi All... > > I've been thinking about using a Cypress Semiconductor > (www.cypress.com) serial Programmable Clock Generator (PCG) as a VFO. > I think the PLL-based design would have much cleaner output compared > to a DDS. But I have some questions: > > Do any of the decent PC programs for SDR control either the Blueberry > or Peppermint PGC eval boards via USB? > > Are the Cypress parts the best solution out there in terms of > PLL-based PCGs? > > It seems Cypress has discontinued the Blueberry evaluation board for > the CY27EE16 PCG (P/N CY30703). > > There is a $20 USD Peppermint eval board available though (P/N > CY30701). Peppermint is USB capable. Peppermint is based on the > CY22393 part, which seems fine, SPI programmable, three PLL's, up to > 200MHz 4X4 crosspoint switch. > > Has anyone used the Peppermint board? Are there any disadvantages to > using the CY22393 instead of the older CY27EE16 that was on the now > discontinued Blueberry board? The only down-side I can see is minor: > The older part supported both SPI and I2C serial protocols, the latter > part does SPI only. > > Thanks, David >
