Author Topic: What model of crystal  (Read 2229 times)

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Offline Crystal-JU-206

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What model of crystal
« on: October 24, 2016, 03:57:28 am »
Dear All,
May I ask who knows what model of crystal generally used in bluetooth products, such as bluetooth USB adaptor, bluetoooth speaker, or bluetooth headphones ?
TKS in advance! :)
 

Offline evb149

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Re: What model of crystal
« Reply #1 on: October 24, 2016, 04:57:29 am »
Download some reference designs for the chip types that you are interested in and the BOM file will list the exact part that is suggested as a good possibility by the IC manufacturer.

Anyway there are only several important criteria for a crystal so any crystal that meets the same 6-9 or so specifications will work for such applications technical requirements.  Then you just consider the availability, size, cost, et. al.

 

Offline Crystal-JU-206

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Re: What model of crystal
« Reply #2 on: October 24, 2016, 06:28:06 am »
Thank you so much
 

Offline Crystal-JU-206

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Re: What model of crystal
« Reply #3 on: October 28, 2016, 03:30:17 am »
 

Offline evb149

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Re: What model of crystal
« Reply #4 on: October 28, 2016, 03:42:25 am »
I do not know where you could buy songji manufacturer's components, but SMD3225 is a generic package type for crystals and many different manufacturing companies make similar sorts of crystals in the 3225 SMD package size.
DigiKey is a distributor that sells many similar size crystals.
http://www.digikey.com/product-search/en

Element14, Mouser, Avnet Electronics, Arrow Electronics are some other distributors that very likely sell such general kinds of crystals.
You will have to match the following parameters well enough to your device:
(a) Crystal nominal frequency xx.xxx MHz.
(b) Crystal oscillation circuit type, usually it is parallel resonant mode, but sometimes it could be series resonant mode.
(c) Crystal frequency tolerance: acceptable parts per million tolerance of the frequency of a crystal compared to the ideal value.
(d) Crystal frequency aging variation tolerance
(e) Crystal operating temperature range
(f) If the resonant circuit mode for the crystal is parallel resonant type (the usual type),, the crystal load capacitance must match the rest of your circuit and PCB.  The nominal load capacitance will be specified in picofarads.
(g) The crystal's maximum ESR, effective series resistance value.  It will be specified by your crystal and circuit / IC to match.
(h) The maximum drive level specified for the crystal must be suited to your circuit's / IC's specification.
(i) The soldering process of your board must be suitable for the chosen crystal.
(j) Of course you may require or prefer a certain crystal package such as SMD type and 3225 size for instance.

That is most of the parameters for a crystal to match a crystal oscillator circuit based on an IC.  If those characteristics are suitably matched between the IC / circuit and the crystal then the crystal should work for the circuit.
 
where can I find Crystal Resonator SMD3225?Do you know
 
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