[PIC] Opinions on these resonators ...
PicDude
I'm looking for an SMD resonator with built-in caps at 20Mhz, that is
physically smaller than the Abracon AWSCR's I currently use, and found these
candidates. Looking for opinions on these, especially as it pertains to
reliablilty issues (such as startup or frequency issues). I'll be using
these with PIC16F's ...
Murata CSTCE20M0V53-R0:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=490-1199-1-ND
Panasonic EFO-BM2005E5:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=PX200BCT-ND
TDK CCR20.0MXC7T:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=445-1649-1-ND
ECS ECS-CR2-20.00-B-TR:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=XC1109CT-ND
The Murata's claim the best tolerance (0.1% initial), so I would lean
towards those first, but reliability is still key.
Thanks,
-Neil.
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Bob Blick
Here's a reprint of a post I made after testing some resonators last year:
I've just tested a handful of 20MHz ceramic resonators
with builtin caps. The board I tested it on has two
pics, one is connected to the resonator, the other is
a slave via a 100 ohm resistor from master's OSCOUT to
slave OSCIN. So it's tougher than your usual single
PIC setup.
The good news is, all the resonators I tested worked,
although I would not use some of them as you will see.
In case you don't know, these are all overtone
resonators. The fundamental (6.666 MHz) is
mechanically suppressed so no tank is required.
All these resonators are surface mount. Unfortunately
there is very little standarization in packaging.
Master PIC is a 16F876A set to HS mode. Slave is a
16F877A set to HS mode.
Scope probe is a Tektronix 6109B 100MHz x10 of unknown
capacitance, probably somewhere around 11 pF.
All the resonators are available at Digikey, since
they are fast and I have an account there :)
Enjoy the results!
-Bob
Panasonic EFJ-C2005E5B (digikey PA200CCT-ND)
1.0 mm pitch, marked with weird squiggly code
$0.41 in 100s
Starts and runs
If started with scope probe attached runs at
fundamental
Feedback amplitude lower than output
ECS ECS-HFR-20.00-B-TR (digikey XC1094CT-ND)
1.0 mm pitch, easy to read 20.00
$0.42 in 100s
Starts and runs
If started with scope probe attached runs at
fundamental
Feedback amplitude lower than output
ECS ECS-CR2-20.00-B-TR (digikey XC1109CT-ND)
1.5 mm pitch, marked 20.0M
$0.42 in 100s
Starts and runs even with scope attached to either
lead
High and balanced amplitude
Panasonic EFO-BM2005E5 (digikey PX200BCT-ND)
1.35 mm pitch, easy to read 20.0
$0.48 in 100s
Starts and runs even with scope attached to either
lead
Very high and balanced amplitude
TDK CCR20.0MXC7T (digikey 445-1649-1-ND)
1.0 mm pitch, 20 marked by laser hard to see
$0.42 in 100s
Starts and runs even with scope attached to either
lead
High amplitude, higher on feedback
Murata CSTCE20M0V53-R0 (digikey 490-1199-1-ND)
1.2 mm pitch, tiny metal package, marked in code E.e.
$0.53 in 100s
Starts and runs even with scope attached to either
lead
Very high and balanced amplitude
AVX PBRC-20.00HR (digikey 478-2114-1-ND)
2.5 mm pitch, marked 20.00Z
$0.62 in 100s
Starts and runs even with scope attached to either
lead
Very high amplitude, higher on feedback
PicDude wrote:
> I'm looking for an SMD resonator with built-in caps at 20Mhz, that is
> physically smaller than the Abracon AWSCR's I currently use, and found these
> candidates. Looking for opinions on these, especially as it pertains to
> reliablilty issues (such as startup or frequency issues). I'll be using
> these with PIC16F's ...
>
> Murata CSTCE20M0V53-R0:
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=490-1199-1-ND
>
> Panasonic EFO-BM2005E5:
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=PX200BCT-ND
>
> TDK CCR20.0MXC7T:
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=445-1649-1-ND
>
> ECS ECS-CR2-20.00-B-TR:
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=XC1109CT-ND
>
>
> The Murata's claim the best tolerance (0.1% initial), so I would lean
> towards those first, but reliability is still key.
>
> Thanks,
> -Neil.
>
>
>
>
>
--
PicDude
Hmmm... not sure how I missed this. Good info, Thanks.
-Neil.
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