rsavas

Member Since: January 24, 2011

Country: Canada

Profile

Spoken Languages

English & foreign vugarity

Programming Languages

C, BASIC, Unix Shells

Universities

Graduated 1980, Centennial College as an Electronics Technologist

Expertise

Telling people the way it is

Interests

Electronics of course, Gardening, fishing/outdoors, drinking/parties

  • Product WRL-10906 | about 2 years ago

    Pretty straight forward, get the data sheet and follow the examples. Get a login, from SI & check out all the application notes, programming guide. Check out SI4735 AM & FM Receiver Shield as an example.

  • News - 1st Annual SparkFun Elect… | about 2 years ago

    Soldering a DFN package, with a 0.5mm pitch is a real challenge for me at least!! Or as “Member #120184” says, add some barnacle wires (30AWG solid) to a 0.5mm pitch QFP, is a good measure of soldering skills. Have done this a number of times to hookup a logic analyzer. Did this when I worked for McDATA, out of Broomfield, just down the road from Boulder. Good luck with these, without a microscope or a 10x magnifier. With these skills, you have a real competition. I guess it depends on your skill level. It would be nice to include some quality metrics as speed is well, just one way to measure ability. When I worked a Motorola many years ago, they would not let any tech. perform re-work because of too much product damage. I could not believe how well the girls could re-work a board using only a de-solder bulb. Have fun folks!!

    Rick

  • Product SWG-10713 | about 2 years ago

    Hey dude, nice dred’s, spark one up, eh!!

  • Product SEN-10701 | about 2 years ago

    No, you can not have two or more devices responding to the same address or you will have bus contention. That is, if they are all powered up at the same time.

    On another note, not sure why one would power this device from 2.5V, this would mean that your I2C interface must run from the same supply voltage. Good luck with that!! This device is capable of having a 3.3V supply. There is nothing that says you can not have different A & D supply voltages, as long as they are within the spec’s.

  • Product DEV-10342 | about 2 years ago

    Hello,

    The antenna tuning cap is only used for AM mode. I beilive that in FM mode, it is set to its maximum value so that it is an RF short to ground. When sending, the Command 0x40. AM_TUNE_FREQ, I set Ant tune cap to “0”, “If both bytes are set to zero, the tuning capacitor value is selected automatically” ANTCAP manual range is 1–6143 You should choose a coil so that in the middle of the AM band, the tuning capacitance is in the middle of it range, 7pF to - Look at the spec, for LW,L=2.8mH, for AM L=180-450uH. Do the math for a resonant circuit at the frequency of interest. As a reference for antenna design ffor SI4735, this site is an wealth of information, http://www.elektronik-labor.de/ElektorDSP/ElektroDSP4.html. Will require goggle translator, as it is in German. For FM,I used a coil of about 100nH. This seems to work well with a 75 ohm source. I will spend some time to evaluate optimization of this value using a transformer or tapped coil.

  • Product WRL-10906 | about 2 years ago

    Process Change Notice #1105171 Title: Si4704/05/06/30/31/34/35 to Revision D PCN; Revisions A, B, C End of Life / Last Time Buy, Last Order Date: 23Nov2011 Would not affect this breakout board, as pin functions have not changed.

  • Product DEV-10342 | about 2 years ago

    That is strange, when I look, Mouser shows non-stocked item, http://www.mouser.com/Search/Refine.aspx?Keyword=Si4735-D60 I even tried Brazil Mouser site & same results. Found out that Digi-Key has stock. 336-2140-ND for $16.20, more than what Sparkfun sells them for!!

  • Product DEV-10342 | about 2 years ago

    Fortifies my earlier statement, “a bunch of idiots”. I’d be awefully upset with these folks if I spent the time & money to design a board using the SPI I/F and they pulled the rug out under my legs. BTW, where did you obtain a D60? I can not find one. Is it in the QFN or SSOP package? Thanks Rick

  • Product DEV-10342 | about 2 years ago

    If this is so, then these folks are a bunch of idiot’s, make a change like this and not notify their customer’s or update the data sheet that they released well after the date you say. I would question the accuracy of the statement from Liang Wu. BTW, C40 is end of life (Process Change Notice #1105171,Last Order Date: 23Nov2011).There is nothing in the PCN that says SPI(3-wire I/F) is removed. I looked at an earlier verion of the D60 datasheet (Rev. 1.0 3/11). It showed that they were directly grounding pin(22) on the -GU part. I was doing my layout at that time, so put provision in for this change. Then in this new release (1.1 11/11)they went back to having it the same as C40-GU, a bypass pin, requiring a 22nF cap to ground. The latest datasheet is still at Rev. 1.1 11/11, as of today,Jan 18,2012. Have you actually been able to get one of these new parts,D60-GU? I can not find one out there. I am using C40-GU, seems to be working okay.

  • Product DEV-10342 | about 2 years ago

    No it is not, it is a QSOP, 0.635" pitch!!

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