Otu esi achọpụta ngwa ngwa Crystal Oscillator ọdịda?

• Kedu nsogbu Crystal oscillator ezighi ezi nwere ike ịkpata?

1.Enweghị nzaghachi na ike - elu (oke ọdịda): Mgbe oscillator kristal akwụsịghị ịmalite oscillating, onye na-ahụ maka isi anaghị enweta elekere ntụaka, mgbagha nrụgharị n'ime enweghị ike mezue, sistemụ ahụ dum ka na-arụ ọrụ. Mgbaàmà ndị a na-ahụkarị gụnyere: nyefe ugbu a dị n'okpuru ọkwa arụ ọrụ nkịtị, amataghị ihe nrụzi, na enweghị ngosi na ihuenyo.

2.Mkpọka ma ọ bụ nrụpụta random n'oge arụ ọrụ (ọdịda dị nro): mbelata na njupụta mmepụta nke oscillator ma ọ bụ mgbanwe mberede na ugboro ole, na-eduga na mmebi oge CPU na nkwụsị ntụziaka na-ezighi ezi. Mgbaàmà ndị a na-ahụkarị gụnyere ifriizi oge ụfọdụ, nrụpụta nke onye nche na-ebute, yana mmeputakwa mmejọ na-ekwekọghị ekwekọ.

3.Cọgwụ mgbochi ọrịaMmegharị interface na mperi mperi:Ngbanwe ugboro elekere (njehie PPM) nwere ike gafere ntakịrị{0} mpio mmekọrịta nke protocols dị ka UART, USB, na Ethernet, na-eduga na data akọrọ, ọdịda checksum, mmụba mgbasa ozi, na, n'ọnọdụ siri ike, nkwụsị njikọ anụ ahụ zuru oke{1}.

4.Ogologo oge na nha nhata ewedara:Maka RTC, mita eletrik, na ngwa ndị ọzọ na-adabere na oge ziri ezi, ịkwọ ụgbọ mmiri na-agbakọta iji mepụta njehie oge kwa ụbọchị. Mgbe kristal na-ata ahụhụ site na ntinye mmiri ma ọ bụ ịka nká, nkeji nke abụọ{1} pulse na-agbanwe, na-emetụta izizi ịgba ụgwọ ma ọ bụ usoro{2}}nkenke oge.

• Kedu ihe kpatara Crystal Oscillators ji ada?

Ewezuga ntụpọ n'ichepụta (dị ka waya dị n'ime{0}oghere mgbụsị akwụkwọ ma ọ bụ nrụgide fọdụrụnụ), usoro ọdịda a na-ahụkarị na ngwa ubi gụnyere:

1.Nchegbu n'ọrụ na ujo ọkụ:Oghere kristal dị elu- dị oke mkpa. Ehulata nchekasị n'oge mwepu PCB na mgbanwe okpomọkụ ngwa ngwa n'oge reflow reflow nwere ike ime ka micro- cracks ma ọ bụ electrode detachment, nke na-eduga na ịrị elu dị nkọ na usoro nguzogide (ESR).

2.Usoro mmetọ nke PCB (ihe fọdụrụnụ):Ịzụta - fụrụ akpụ na-etolite ụzọ ntapu na-adịghị ike n'etiti ntụtụ, na-ewebata nguzogide nje parasitic na-eweda ọscillation na-ebelata{1} uru loop. Ọnọdụ dị nro na-ebute mgbanwe ugboro ugboro; ikpe siri ike na-eduga na mfu nke oscillation.

3.Oscillation ụdị ụda olu:Ọ bụrụ na arụghị ikike ibu ma ọ bụ ọkwa ọkwọ ụgbọ ala nke ọma, oscillator nwere ike igbachi na ugboro nke 3rd ma ọ bụ 5th overtone nke kristal. N'okwu a, kristal n'onwe ya adịghị agbaji, mana elekere usoro na-aghọ ọnụọgụ nke ugboro ole a chọrọ, na akụkụ niile na-arụ ọrụ adịghị mma.

4.Mmebi nke mwepu ọkụ (ESD):Ihe egwu a dị mkpa maka oscillators na-arụ ọrụ nwere sekit CMOS dị n'ime. ESD nwere ike mebie ọnụ ụzọ ámá oxide, na mmejọ ya na-egosipụtakarị dị ka enweghị ntụkwasị obi ugboro ugboro na oke okpomọkụ.

5.Ugboro -okpomọkụ ịkpafu:N'akụkụ oke ọnọdụ okpomọkụ akọwapụtara na akwụkwọ data (dịka, -20 ogo ma ọ bụ +70 ogo), mgbagha ugboro ugboro na-abawanye nke ọma. Ọ bụrụ na ikpo ọkụ nke onwe- na-agbakwunye na ọnọdụ okpomọkụ, nkwụghachi n'ezie nwere ike iru ọtụtụ narị ppm.

6.Ike ịkwọ ụgbọala karịrị akarị: Ịkwọ ụgbọala dị elu nke ukwuu na-ebuli nrụgide okpomọkụ na oghere kristal, na-eme ka ịka nká dịkwuo elu, ma nwee ike ịkpalite mgbanwe ndị na-abụghị{0}linear impedance, na-eweda nkwụsi ike ugboro ole.

• HOlee otú ibelata ihe ize ndụ nke Crystal Oscillator mmebi?

1.Nhazi PCB iji zeren'ibunrụgide:Debe kristal dị ka o kwere mee na ntụtụ IC, debe akara ndị ahụ mkpụmkpụ na ala-; zere ịchọta ya nso panel{1}}akụkụ nkewa ma ọ bụ mpaghara nrụgide- dị elu, ma tụlee ịgbakwụnye oghere dịpụrụ adịpụ.

2.Soldering na nhicha akara: Jiri mba - dị ọcha flux wee mee nnwale mmetọ ion ka ọ gafechara ire ere; etinyela nrụgide kwụ ọtọ na ahụ kristal.

3.Tọọ ike mbanye kwesịrị ekwesị:Dakọta usoro nke ugbu a- na-amachi resistor (nke na-abụkarị 100 Ω ruo 1 kΩ) iji dokwaa ikike draịva n'ezie n'okpuru 100 μW, dabere na akwụkwọ datasheet{4}} ụkpụrụ akwadoro.

4.Nchekwa ESD:Yiri eriri - static nkwojiaka n'oge a na-ere ya, wee hụ na bench arụrụala nke ọma.

5.Mgbanwe gburugburu:Maka ngwa mpụga siri ike ma ọ bụ ụgbọ ala, họrọ ụlọ ọrụ mmepụta ihe/ụgbọala{0}}ọla (-40 degrees to +125℃) metal{3}}ngwugwu kristal na-enyekwa mgbochi mmiri na sulfidation.