Passive crystal and active brilliant brace up limits of distinction, application and usage
Passive crystal and active brilliant brace up limits of distinction, application and usage:
1, passive crystal — passive crystal needs to use DSP piece the oscillator inside, there is the join method of the proposal on Datasheet. Passive crystal does not have the problem of voltage, signal n is alterable, it is the basis rises that is to say brace up circuit will decide, same crystal can apply to a variety of voltage, can use at the DSP that voltage of a variety of different clock signal ask, and the price normally inferior also, if the condition permits a proposal,use crystal to general application accordingly, this agrees with especially product line abounds batch of generous generator. Passive crystal is opposite Yu Jing brace up its blemish is signal quality poorer, normally need matchs periphery circuit accurately (wait with the electric capacity that matchs at signal, inductance, resistor) , change circumjacent configuration circuit needs to do corresponding adjustment when the crystal of different frequency. The proposal uses the quartz with taller precision crystal, do not use the vigilance of pottery and porcelain with low precision as far as possible.
2, active brilliant brace up — active brilliant brace up the in-house oscillator that does not need DSP, signal quality is good, stabler, and join way is relatively simple (basically be to make wave of filter of good power supply, use network of wave of the PI that a capacitance and inductance form filter normally, the resistor that output end is worth with a small block filters signal can) , do not need complex configuration circuit. Active brilliant brace up normally usage: One foot is impending, 2 feet ground connection, 3 feet receive output, 4 feet receive voltage. Opposite at passive crystal, active brilliant brace up blemish is his signal n is fixed, need has chosen appropriate output n, flexibility is poorer, and the price is high. To the application with sequential sensitive requirement, the brilliant that the individual thinks returning is active brace up good, because can choose more accurate brilliant brace up, it is high-grade temperature compensation brilliant even brace up. Some DSP interior did not rise brace up circuit, the any crystalline substance that can use active only brace up, the 6000 series that are like TI. Active brilliant brace up compare at passive crystal volume is normally larger, but now a lot of active brilliant brace up the watch is stuck, bulk and crystal comparative, some is even smaller than a lot of crystal even.
A few note:
1, the DSP that needs times frequency needs to configure good PLL periphery to configure circuit, basically be segregation and filter wave;
2, the crystal brilliant under 20MHz brace up the parts of an apparatus that basically is fundamental frequency, stability is good, of 20MHz above is harmonic mostly (wait a moment like 5 3 harmonic, harmonic) , stability is poor, because this suggests strongly to use the parts of an apparatus of low frequency, after all the circumjacent configuration that the PLL circuit that times frequency uses needs basically is capacitance, resistor, inductance, its stability and price side are far good at crystal brilliant brace up parts of an apparatus;
3, clock signal takes line length as far as possible short, the line is broad as far as possible big, print line span with other as far as possible big, rely on wiring of layout of parts of an apparatus closely, can walk along lining when necessary, and surround with ground wire;
4, through backboard from exterior when introducing, bell signal designs a requirement specially from time to tome, need the data related detailed reference.
In addition do a few specifications even:
Overall for brilliant brace up the body of respect good Yu Jing such as stability, especially nicety is measured wait for a domain, what great majority uses is high-grade brilliant brace up, such OK an all sorts of compensation technologies are compositive together, reduced the complexity of the design. Just think, if use crystal, next oneself design compensation of undee plastics, interference rejection, temperature, what kind of will the complexity that in that way word designs be? The tall to clock requirement circumstance such as radio frequency circuit is designed here, use high accuracy lukewarm Bu Jingzhen namely, of industrial level want 100 yuan several one.
If the application of special domain cannot find appropriate any crystalline substance brace up, the complexity that designs that is to say exceeded brilliant of the finished product on the market brace up level, must oneself were designed, be about to choose crystal below this kind of circumstance, nevertheless these crystal are not the common crystal on the market for certain, however special high-end crystal, if ruby crystal is waited a moment.
The domain situation of higher demand is more special, even the equipment such as atomic clock, rubidium bell offers the clock that uses when high accuracy checks here, accept plug-in unit connection through appropriative radio frequency, it is a large facility, quite cumbersome.
1, brilliant brace up: Namely alleged quartz crystal resonator and quartz a general designation of crystal clock oscillator. In because be in,consuming kind of electron product nevertheless, what resonator uses is more, general concept is so medium brilliant brace up be equal to understand at resonator. Latter indicates normally namely Zhong Zhen.
2, classification. Say resonator above all.
Resonator is divided commonly for plug-in unit (Dip) and stick piece (SMD) . Divide again in plug-in unit for HC-49U, HC-49U/S, tonometer model (columnar) . HC-49U weighs 49U commonly, some purchase common to say ” tall model ” , and HC-49U/S weighs 49S commonly, common says ” short model ” . Tonometer can divide according to body integral for 3*8, 2*6, 1*5, 1*4 is waited a moment. Stick piece model it is to press size and foot will classify. For example 7*5 (0705) , 6*3.5 (0603) , 5*3.2 (5032) etc. Foot the branch that has 4pin and 2pin.
And the oscillator also is OK cent is mixed for plug-in unit stick piece. Of plug-in unit can press size and foot will divide. For example of so-called full measure, weigh a rectangle again or 14pin, of half dimension call a square again or 8pin. What want an attention nevertheless is, the 14pin here and 8pin are the crural digit that points to IC of oscillator interior core, oscillator itself is 4pin. And from different application the level is divided, can divide again for) of OSC(common Zhong Zhen, TCXO (temperature is compensated) , VCXO (pressure accuse) , OCXO (constant temperature) etc.
3, basic technical terms. I think this also is a lot of places that purchase a classmate to blur quite. I chose a few commonly used resonator term to be taken here become an explanation.
Frequency Tolerance (adjust frequency difference) : Below rated condition, in fiducial temperature (2 ℃ of 25 ± ) with nominal the deviation that frequency allows. Use PPm commonly (hundred) express.
) of frequency difference of Frequency Stability(temperature: Point to the working temperature limits in the regulation inside, with nominal the deviation that frequency allows. Express with PPm.
Aging (year ageing leads) : Below rated condition, the opposite change that crystal job frequency lets time and allows. With year lead to year of ageing is called when quantum of time is measured.
Shunt Capacitance (electrostatic look) : The capacitance that receives with series connection arm in equivalent circuit, also cry and capacitance, express with C0 normally.
Load Capacitance (laden capacitance) : Decide the effective outside electric capacity of FL of laden and syntonic frequency together with crystal, express with CL normally.
The parameter that pays close attention to most commonly has 2, adjust frequency difference namely, laden capacitance. One part has a demand to temperature frequency difference. If working temperature range is wider, can be opposite working temperature limits asks somewhat, namely alleged wide lukewarm.
4, choose: Basically tell tell resonator. Theoretic for, want parameter to decide only, choosing a kind of any model can be used normally. For example 49U and 49S are replaced, 49S and cylinder and and stick piece replace, do not have a problem. But ground of the meeting in choosing actually circuit characteristic, cost and convenience sex will think and choose. Generally speaking, basically be in simple application considering from cost. But some products or circuit will be right brilliant brace up equivalent resistor, incentive power raises a requirement etc, can be so in different type try to choose. Additional, stick piece basically be to get used to a product increasingly miniaturization and the requirement that improve manufacturing efficiency. Hear some to purchase a friend to say, can choose 49S only and cannot use 49U or conversely, this is a small error. Ah.
And the requirement of character of Zhong Zhen that chooses to basically decide product circuit, generally speaking the demand that Zhong Zhen achieves relevant applying in accurate sex and need will be better. For example mobile phone, communication equipment stands, the satellite is waited a moment.
1, passive crystal — passive crystal needs to use DSP piece the oscillator inside, there is the join method of the proposal on Datasheet. Passive crystal does not have the problem of voltage, signal n is alterable, it is the basis rises that is to say brace up circuit will decide, same crystal can apply to a variety of voltage, can use at the DSP that voltage of a variety of different clock signal ask, and the price normally inferior also, if the condition permits a proposal,use crystal to general application accordingly, this agrees with especially product line abounds batch of generous generator. Passive crystal is opposite Yu Jing brace up its blemish is signal quality poorer, normally need matchs periphery circuit accurately (wait with the electric capacity that matchs at signal, inductance, resistor) , change circumjacent configuration circuit needs to do corresponding adjustment when the crystal of different frequency. The proposal uses the quartz with taller precision crystal, do not use the vigilance of pottery and porcelain with low precision as far as possible.
2, active brilliant brace up — active brilliant brace up the in-house oscillator that does not need DSP, signal quality is good, stabler, and join way is relatively simple (basically be to make wave of filter of good power supply, use network of wave of the PI that a capacitance and inductance form filter normally, the resistor that output end is worth with a small block filters signal can) , do not need complex configuration circuit. Active brilliant brace up normally usage: One foot is impending, 2 feet ground connection, 3 feet receive output, 4 feet receive voltage. Opposite at passive crystal, active brilliant brace up blemish is his signal n is fixed, need has chosen appropriate output n, flexibility is poorer, and the price is high. To the application with sequential sensitive requirement, the brilliant that the individual thinks returning is active brace up good, because can choose more accurate brilliant brace up, it is high-grade temperature compensation brilliant even brace up. Some DSP interior did not rise brace up circuit, the any crystalline substance that can use active only brace up, the 6000 series that are like TI. Active brilliant brace up compare at passive crystal volume is normally larger, but now a lot of active brilliant brace up the watch is stuck, bulk and crystal comparative, some is even smaller than a lot of crystal even.
A few note:
1, the DSP that needs times frequency needs to configure good PLL periphery to configure circuit, basically be segregation and filter wave;
2, the crystal brilliant under 20MHz brace up the parts of an apparatus that basically is fundamental frequency, stability is good, of 20MHz above is harmonic mostly (wait a moment like 5 3 harmonic, harmonic) , stability is poor, because this suggests strongly to use the parts of an apparatus of low frequency, after all the circumjacent configuration that the PLL circuit that times frequency uses needs basically is capacitance, resistor, inductance, its stability and price side are far good at crystal brilliant brace up parts of an apparatus;
3, clock signal takes line length as far as possible short, the line is broad as far as possible big, print line span with other as far as possible big, rely on wiring of layout of parts of an apparatus closely, can walk along lining when necessary, and surround with ground wire;
4, through backboard from exterior when introducing, bell signal designs a requirement specially from time to tome, need the data related detailed reference.
In addition do a few specifications even:
Overall for brilliant brace up the body of respect good Yu Jing such as stability, especially nicety is measured wait for a domain, what great majority uses is high-grade brilliant brace up, such OK an all sorts of compensation technologies are compositive together, reduced the complexity of the design. Just think, if use crystal, next oneself design compensation of undee plastics, interference rejection, temperature, what kind of will the complexity that in that way word designs be? The tall to clock requirement circumstance such as radio frequency circuit is designed here, use high accuracy lukewarm Bu Jingzhen namely, of industrial level want 100 yuan several one.
If the application of special domain cannot find appropriate any crystalline substance brace up, the complexity that designs that is to say exceeded brilliant of the finished product on the market brace up level, must oneself were designed, be about to choose crystal below this kind of circumstance, nevertheless these crystal are not the common crystal on the market for certain, however special high-end crystal, if ruby crystal is waited a moment.
The domain situation of higher demand is more special, even the equipment such as atomic clock, rubidium bell offers the clock that uses when high accuracy checks here, accept plug-in unit connection through appropriative radio frequency, it is a large facility, quite cumbersome.
1, brilliant brace up: Namely alleged quartz crystal resonator and quartz a general designation of crystal clock oscillator. In because be in,consuming kind of electron product nevertheless, what resonator uses is more, general concept is so medium brilliant brace up be equal to understand at resonator. Latter indicates normally namely Zhong Zhen.
2, classification. Say resonator above all.
Resonator is divided commonly for plug-in unit (Dip) and stick piece (SMD) . Divide again in plug-in unit for HC-49U, HC-49U/S, tonometer model (columnar) . HC-49U weighs 49U commonly, some purchase common to say ” tall model ” , and HC-49U/S weighs 49S commonly, common says ” short model ” . Tonometer can divide according to body integral for 3*8, 2*6, 1*5, 1*4 is waited a moment. Stick piece model it is to press size and foot will classify. For example 7*5 (0705) , 6*3.5 (0603) , 5*3.2 (5032) etc. Foot the branch that has 4pin and 2pin.
And the oscillator also is OK cent is mixed for plug-in unit stick piece. Of plug-in unit can press size and foot will divide. For example of so-called full measure, weigh a rectangle again or 14pin, of half dimension call a square again or 8pin. What want an attention nevertheless is, the 14pin here and 8pin are the crural digit that points to IC of oscillator interior core, oscillator itself is 4pin. And from different application the level is divided, can divide again for) of OSC(common Zhong Zhen, TCXO (temperature is compensated) , VCXO (pressure accuse) , OCXO (constant temperature) etc.
3, basic technical terms. I think this also is a lot of places that purchase a classmate to blur quite. I chose a few commonly used resonator term to be taken here become an explanation.
Frequency Tolerance (adjust frequency difference) : Below rated condition, in fiducial temperature (2 ℃ of 25 ± ) with nominal the deviation that frequency allows. Use PPm commonly (hundred) express.
) of frequency difference of Frequency Stability(temperature: Point to the working temperature limits in the regulation inside, with nominal the deviation that frequency allows. Express with PPm.
Aging (year ageing leads) : Below rated condition, the opposite change that crystal job frequency lets time and allows. With year lead to year of ageing is called when quantum of time is measured.
Shunt Capacitance (electrostatic look) : The capacitance that receives with series connection arm in equivalent circuit, also cry and capacitance, express with C0 normally.
Load Capacitance (laden capacitance) : Decide the effective outside electric capacity of FL of laden and syntonic frequency together with crystal, express with CL normally.
The parameter that pays close attention to most commonly has 2, adjust frequency difference namely, laden capacitance. One part has a demand to temperature frequency difference. If working temperature range is wider, can be opposite working temperature limits asks somewhat, namely alleged wide lukewarm.
4, choose: Basically tell tell resonator. Theoretic for, want parameter to decide only, choosing a kind of any model can be used normally. For example 49U and 49S are replaced, 49S and cylinder and and stick piece replace, do not have a problem. But ground of the meeting in choosing actually circuit characteristic, cost and convenience sex will think and choose. Generally speaking, basically be in simple application considering from cost. But some products or circuit will be right brilliant brace up equivalent resistor, incentive power raises a requirement etc, can be so in different type try to choose. Additional, stick piece basically be to get used to a product increasingly miniaturization and the requirement that improve manufacturing efficiency. Hear some to purchase a friend to say, can choose 49S only and cannot use 49U or conversely, this is a small error. Ah.
And the requirement of character of Zhong Zhen that chooses to basically decide product circuit, generally speaking the demand that Zhong Zhen achieves relevant applying in accurate sex and need will be better. For example mobile phone, communication equipment stands, the satellite is waited a moment.