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  • 1.6x1.0mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PSX1610 Features Ultra miniature SMD tuning fork crystal resonator A ceramic package with metal lid providing high precision and reliability. Metal lid connected to GND terminal to reduce EMI Suitable for mobile communications and consumer devices. Applications Mobile communications and consumer devices, etc. Smart card and Wearable devices More

  • 2.0x1.2x0.5mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PSX215 Features Ultra miniature SMD tuning fork crystal resonator A ceramic package with metal lid providing high precision and reliability. Metal lid connected to GND terminal to reduce EMI Suitable for mobile communications and consumer devices. Applications Mobile communications and consumer devices, etc. Smart card and Wearable devices More

  • 3.2 x 1.5mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PSX315 Features 3215 Size Miniature And Fork Crystal Resonator With A Low Profile Pf 0.75mm. A Ceramic Package Providing High Precision And Reliability. Metal Lid Connected To GND Terminal To Reduce EMI. Noise Resistance Application (Smart Meter Etc.) series resistance 50KΩ max available. AEC-Q200 Compliant Applications Mobile Communications, PDA, Wave Clock, Digital Appliance Auto Motive Applications Such As Multimedia Device More

  • 4.1x1.5mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PSX415 Features 4115 size miniature and fork crystal resonator with a low profile pf 0.75mm. a ceramic package providing high precision and reliability. metal lid connected to GND terminal to reduce EMI. Noise Resistance application (smart meter etc.) AEC-Q200 compliant Applications mobile Communications, PDA, wave clock, digital appliance auto motive applications such as multimedia device More

  • 6.9x1.4mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PMX145 Features Ultra Miniature SMD Tuning Fork Crystal Resonator Plastic molded SMD tuning fork crystal of heat-resistance Metal Lid Connected To GND Terminal To Reduce EMI Suitable For Mobile Communications And Consumer Devices. Applications Mobile Communications And Consumer Devices, Etc. Smart Card And Wearable Devices More

  • 8.0x3.2mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PMX206 Features Ultra Miniature SMD Tuning Fork Crystal Resonator Plastic molded SMD tuning fork crystal of heat-resistance Metal Lid Connected To GND Terminal To Reduce EMI Suitable For Mobile Communications And Consumer Devices. Applications Mobile Communications And Consumer Devices, Etc. Smart Card And Wearable Devices More

  • 9.6x4.0mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PMX405 Features Ultra Miniature SMD Tuning Fork Crystal Resonator Plastic molded SMD tuning fork crystal of heat-resistance Metal Lid Connected To GND Terminal To Reduce EMI Suitable For Mobile Communications And Consumer Devices. Applications Mobile Communications And Consumer Devices, Etc. Smart Card And Wearable Devices More

  • 9.6x4.0mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PMX406 Features Ultra Miniature SMD Tuning Fork Crystal Resonator Plastic molded SMD tuning fork crystal of heat-resistance Metal Lid Connected To GND Terminal To Reduce EMI Suitable For Mobile Communications And Consumer Devices. Applications Mobile Communications And Consumer Devices, Etc. Smart Card And Wearable Devices More

  • Test Method to Measure Oscillator's Performances
    Test Method to Measure Oscillator's Performances
    • Mar 01, 2021

    Oscillation Allowance (OA) from “MICRO CRYSTAL” Test-Methode to measure the Oscillator-Performance -Resistor Rx is placed in series to the crystal. -Increase Rx until oscillation stops / starts. Oscillation Allowance (OA) from “MICRO CRYSTAL” . The OA value describes the performance of the active part of the oscillator (inverter). .Rx value is increased until the oscillation starts / stops. .OA= RXstart+ESRxTAL .Safety margin: The maximal crystal ESR(Rs1,R1) must be 5 times smaller than the OA, in order to have enough safety margin for lC's production tolerances and negative influence of increasing ambient temperature on lC and crystal .ESRTYP≤OA/ 5 Why a Safety Margin is Needed? Crystal ESR vs Temperature Effective Load Capacitance ·CG and CD are the load capacitors of the oscillator circuit (regarded in series). They are integrated into the lC or external as SMD components. · Cstray is equal to the board layout stray(parasitic) capacitance. ·CLoadis equal to CG and CD in series + Cstray . CL of the crystal is the capacitance CLoad the crystal needs to“see”from the oscillator circuit, it is not the capacitance of the crystal itself. CLoad=CD*CG/(CD+CG))+Cstray Chart of△FL,Dependant on CL Load Capacitance / pF Load Capacitance / pF Defining CLoad FL: 32.768 kHz CL:12.5 pF Tol.:+/- 30 ppm Always start with a known crystal! R1 Fs C1 ∆ FL C0 P ㏀ KHz fF ppm pF ㎼ 39.684 32.76557 2.25 +9.9 0.86 1.037 Frequency measured on a buffered clock output.√ Frequency measured directly on the crystal: Using a high impedance probe (0.1 pF).√ Using a standard probe (8-12 pF).Ⅹ Frequency offset calculation from time observation on a display over several days.√ The result represents the design offset + the crystal's tolerance (∆FL). Frequency vs Temperature Conventional Tuning Fork T: 25+/-5℃ Temperature /℃ Frequency Accuracy Time Deviation of a 32.768 kHz Crystal Deviation ppm Per day seconds Per 3days seconds Per month seconds Per year minutes Specified Tolerance +100 8.64 25.9 259 51.8 Specified Tolerance +30 2.59 7.8 78 15.6 Specified Tolerance +20 1.73 5.2 52 10.4 Specified Tolerance +10 0.86 2.6 26 5.2 Nominal Frequency 0 0.00 0 0 0 Specified Tolerance -10 -0.86 -2.6 -26 -5.2 Specified Tolerance -20 -1.73 -5.2 -52 -10.4 Specified Tolerance -30 -2.59 -7.8 -78 -15.6 Specified Tolerance -100 -8.64 -25.9 -259 -51.8 Frequency Accuracy Additionally to the specified tolerance,the following factors influence the total time deviation: . The aging of the crystal as a permanent frequency shift. . The design offset: mismatch between the crystal CL specification and the effective load capacitance of the oscillator design. - The frequency vs temperature characteristic as a temporary frequency shift. Example of Calculation Crystal Tolerance +8.0 ppm crystal Aging -1.0 ppm Design Offset +5.8 ppm Temperature Drift at 35℃ -3.5 ppm Total +9.3...

  • Mother of Timing 32.768kHz Clock Crystal
    Mother of Timing 32.768kHz Clock Crystal
    • Feb 26, 2021

    Clock Crystal Specification: FL:32.768kHz, CL:12.5pF,Tol.: +/-30ppm Standard Pierce Oscillator from MICRO CRYSTAL WITZERLANO information: The"inverter" characteristics define the oscillator's performances and crystal constraints. The serial resistor R.helps to suppress the crystal's overtone mode and may helps toreduce the drive level. The chosen crystal and its specification should match the oscillator's design and constraints. The load capacitors Cg and C。 (regarded inseries) form the oscillator's effective load capacitance. Oscillation Conditions - Loop gain: At steady state, the closed loop gain = 1. . Phase shift: At the oscillation's frequency, the closed loop phase shift = 2T .Startup: When initially energized,the noise component at the frequency which satisfies the phase condition for oscillation is propagated around the loop with increasing amplitude.Startup times around 1 second are normal values for such low frequency tuning fork crystals. Amplitude: The signal amplitude increases continually, until the amplifier gain is reduced either by nonlinearity of the active elements ("Self Limiting Pierce") or by some automatic level control (AGC circuitry, "Controlled Pierce"). Things to Check on an Oscillator . Oscillation Allowance: Negative resistance model, crystal constraints. . Effective Load Capacitance: Frequency accuracy. . Overtone Mode Suppression: Crystal's overtone mode ~6.ix the fundamental mode frequency.. . Drive Level: Maximal power which could be dissipated by the crystal. Layout Considerations General Constraints - Crystals oscillators are analog circuit and the PCB design must follow analog-board layout rules. · Tuning Fork crystals drive level is extremely low(<1 uW). . Long traces make crystals oscillators very sensitive to ESD,EMC and crosstalk. For all these reasons, special attention should be paid on the PCB layout! Design Rules . Traces between the micro controller pins, the crystal and the external load capacitors, should be as short as possible. · External load capacitors layout have to be symmetrical and both ground connections should be as close as possible. . ln order to avoid direct signal coupling,XIN and XOUT traces should be routed as far as possible from each other. - Routing on inner layers and vias must be avoided. .Digital signal lines should be kept as far as possible from the crystal. . Digital signal lines should not be routed on inner layers under the crystal area. . The crystal housing (Metal-can packages) should be connected to ground. .A ground guard ring or an inner layer (or opposite side) ground plane is recommended.The guard ring or ground plane should be connected with a short trace to VSS of the micro controller, and should not be connected to any other ground signals. Layout Example 1: Layout Example 2 Zhe Jiang A-Crystal electronic technology Co.,Ltd A-Crystal factory tour: https://www.youtube.com/watch?v=uMqJq6e_8Ew Web: ...

  • Motion of a tuning fork crystal
    Motion of a tuning fork crystal
    • Feb 23, 2021

    Acrystal tuning fork crystals from the Quartz Bar crystals on wafer to assembly metal package with cylinder type and assembly ceramic package with SMD type, which have good selling in whole world. Fundamental Mode Overtone Mode 6 times fund mode Tuning Fork vs AT-Cut: Tuning Fork: . Frequency Range: 10KHz to 200KHz with fundamental mode. 200KHz to 560KHz with overtone mode(6.1xfundamental). 560KHz to 2.1MHz with extensional mode resonator . Drive Level: 1uW max. and applications on power saving or sleep mode crystals, low power crystals, RTC AT-CUT: .Frequency Range: 2MHz to 30MHz with fundamental mode. >30 MHz with 3rd,5th and 7th harmonics are possible. 30MHz to 250MHz with High frequency fundamentals/inverted mesa crystals . Drive Level: 500uW max. and applications on Clock oscillators, VCXO,TCXO,OCXO Crystal Shapes: Crystal Size Evolution 32.768KHz from 5.0mm to 1.6mm Crystal Geometry CC7V. Here we will quote MICRO CRYSTAL's data information as below: Zhe Jiang A-Crystal electronic technology Co.,Ltd A-Crystal factory tour: https://www.youtube.com/watch?v=uMqJq6e_8Ew Web: https://www.acrystals.com/ Email: eva.wang@acrystals.com Wechat:13857686588 Address: 17th Building, A District, Feiyue Technology Innovation Park, Jiaojiang, Taizhou, Zhejiang, China. ZIP:318014 #32.768kHz Crystal #32.768khz #32.768khz tuning fork crystal #SMD 3215 32768Hz Xtal #Electronic Component 32.768KHz #32.768 khz Crystal Oscillator #watch Crystal 32.768 khz #Quartz Resonator 32.768 KHz #Resonator 32.768 KHz #Quartz 32.768 KHz #32.768KHz DIP Tuning Fork #12.5pf 20ppm 32.768KHz #Electronic Component Crystals 32.768KHz #32.768KHz 6pF Quartz Crystal #DIP Tuning Fork Xtal 32.768KHz #Components Resonator 32.768KHz 6pF Quartz Crystal #32.768KHz Crystal Oscillator #SMD 32.768KHz #32.768KHz Crystal 3225 #Oscillator 32.768KHz #SMD Oscillator 32.768KHz

  • How to Test the values of Q on Resonator oscillator & Quartz Crystal
    How to Test the values of Q on Resonator oscillator & Quartz Crystal
    • Dec 29, 2020

    Values of Q test and the relationship between Qo & the size of cavities For the cavity filter used in the field of modern mobile communication base stations, the insertion loss is one of the essential RF key indicators. We often expect the smaller the loss, the better: if the insertion loss of the filter can be effectively reduced, it will be of great benefit to the realization of other indicators of the filter or to the entire mobile base station system. The development of modern mobile communications, especially 5G micro base stations, requires the size of filters to become smaller and smaller, which will inevitably bring about the reduction of the unloaded Q value of a single cavity. Therefore, how to effectively use the limited cavity volume and allocate the Q value has become the key to the filter insertion loss. The designers of most filter design companies design a single cavity with almost the same size for each channel. In fact, the reasonable layout of the size of each single cavity can reduce the insertion loss of the filter, increase the insertion loss margin of the product, and even make the product of the customer index that cannot be achieved in the first place, thereby meeting customer requirements. 1. The relationship between Q value and single cavity size The Q value is a measure of the average energy storage and loss of the resonant tank. Large energy storage and small loss means high Q value. The Q value is related to the volume and surface area of a single cavity. The larger the volume, the greater the electromagnetic energy stored in the single cavity. The smaller the surface area, the smaller the loss of the single cavity, and the greater the Q value, and vice versa. Here we share some reference values of filter single cavity (including circular cavity and square cavity) of different sizes and corresponding Q values of each frequency band. For your reference and reference when designing. AMPS AMPS GSM GSM Cavity size(mm) F0(RX) 836MHz Q0 F0(TX) 881MHz Q0 F0(RX) 902MHz Q0 F0(TX) 948MHz Q0 F0 1530MHz Q0 20 1280 1310 1330 1360 1730 25 1600 1640 1660 1700 2160 30 1910 1970 1990 2040 9590 35 2230 2306 2330 2360 3020 40 2550 2630 2660 2720 3450 45 2870 2950 2990 3060 3880 50 3190 3280 3300 3400 4310 55 3500 3610 3650 3740 4740 DCS DCS PCS PCS UMTS Cavity size(mm) F0(RX) 1747MHz Q0 F0(TX) 1842MHz Q0 F0(RX) 1880MHz Q0 F0(TX) 1960MHz Q0 F0 2140MHz Q0 20 1850 1900 1920 1960 2040 25 2310 2370 2390 2440 2550 30 2770 2840 2870 2930 3060 35 3230 3310 3350 3420 3570 40 3690 3780 3820 3900 4070 45 4140 4250 4200 4380 4580 50 4600 4720 4770 4870 5080 55 5050 5190 5240 5350 5580 AMPS AMPS GSM GSM Square cavity size(mm) F0(RX) 836MHz Q0 F0(TX) 881MHz Q0 F0(RX) 902MHz Q0 F0(TX) 948MHz Q0 F0 1530MHz Q0 20×20 1530 1580 1600 1640 2080 25×25 1910 1970 2000 2040 2600 30×30 2300 2360 2390 2450 3110 35×35 2680 2760 2790 2860 3630 40×40 3060 3150 3190 3270 4140 45×45 3440 3540 3590 3600 4660 50×50 3820 3940 3990 4080 5170 55×55 4200 4330 4380...

  • The Solutions & Reasons for Making the Crystal Oscillator Working
    The Solutions & Reasons for Making the Crystal Oscillator Working
    • Jun 14, 2019

    The importance of a crystal is equal to the heart of mankind. The crystal oscillator in the motherboard suddenly does not work, it is really anxious, the crystal oscillator is usually stopped for what reason. Crystal oscillator can not solve the solution: 1, the material parameter selection error causes the crystal to not vibrate This problem occurs more in the load capacitance of the crystal, why is the load capacitance easy to make a mistake? In the use of passive crystal oscillators, the external components usually need external capacitors and other components, so that the passive crystal oscillator can normally start to work for the IC. Here, we need to note that the unit of the external capacitor is also PF, and the load capacitance unit of the crystal oscillator is also PF. When the supplier asks about the load capacitance, it is easy to confuse the parameters of the two, so the parameters are not Matching will naturally cause the crystal oscillator to not start properly, or the frequency accuracy will be biased, and it will easily stop the vibration when the crystal oscillator performance is stable. 2, the internal wafer is broken or damaged, resulting in no vibration This problem occurs mostly in cylindrical crystal oscillators, 49/S crystal oscillators, ceramic plug-in crystal oscillators, etc. Therefore, the series of crystal oscillators have no fixed braids, and they are all packaged in transparent bags. It is easy to be damaged during transportation, or the wafers inside the crystals are damaged due to factors such as falling and impact during use, resulting in the crystals not vibrating. 3, the oscillation circuit does not match, causing the crystal to not vibrate Three indicators affecting the oscillation circuit: frequency error, negative impedance, and excitation level. The frequency error is too large, causing the actual frequency to shift to the nominal frequency and causing the crystal to not vibrate. This is also a lot of purchases do not understand, the same frequency, the same package of crystal oscillators will have different unit prices, because the higher the accuracy of the crystal oscillator, which means the better product performance. Do not blindly pursue the price of crystal oscillators, and ignore the quality of crystal oscillators! Solution: Choose the right PPM value for the product. Negative impedance If the negative impedance is too large or too small, the crystal will not vibrate. Solution: If the negative impedance is too large, the value of the crystal external capacitors Cd and Cg can be increased to reduce the negative impedance. If the negative impedance is too small, the values of the external capacitors Cd and Cg can be adjusted to increase the negative. Sexual impedance. In general, the negative impedance value should satisfy not less than 3-5 times the nominal maximum impedance of the crystal. Excitation level If the excitation level is too large or too small, the crystal will not vibrate. Solution: Ad...

  • Micro Precision Clock Crystal for Wireless Communication Solutions
    Micro Precision Clock Crystal for Wireless Communication Solutions
    • Jun 14, 2019

    The crystal oscillator is the most important component of the clock circuit. It can provide the standard time for timing control. In wireless communication equipment, the accuracy of the crystal oscillator and the stability of the operating frequency directly determine the reliability of the communication product. The main products include: passive crystal, active crystal oscillator, TCXO, VCXO, SAW oscillator, etc. The frequency coverage ranges from KHz to GHz. In recent years, with the widespread use of Bluetooth technology and WiFi technology, its market share in the field of wireless communication has become more and more significant, especially the emergence of smart phones and tablets, and the use of various devices has increased, and in the device. Most of them have wireless communication functions, and an important device for realizing wireless communication connection is the crystal oscillator module. With the concept of smart wear, the demand for micro-precision clock crystal oscillators is becoming more and more obvious. According to the new wireless communication application, A-Crystal has introduced some high-precision crystal oscillator products with small size, low thickness and high cost performance, which can well meet the application requirements of various wireless communication modules for clock crystal. Features: 1. High precision 2. Can adapt to harsh industrial application temperature environment 3. Small size package for small portable communication devices Application industry: Smartphone 2. Bluetooth, WLAN 3. Microprocessor 4. GPS field 5. Telecommunications industry

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