!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 1 example of noise suppression in desktop pcs noise emission status noise is emitted from the cables connected to a personal computer when using a computer case that does not have efficient shielding radiated noise from the computer body may sometimes cause problems 1 extension card back side of pc power supply usb mouse keyboard display cable conducted noise radiated noise 2
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!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 2 example of noise suppression in notebook pcs noise emission status noise emission from pc body lcd connection cables and connection cable between pc body and lcd in notebook pcs pcbs incorporate many signal lines with high-level noise generally notebook pcs use a resin case with conductive plating which provides a lower shielding effect than the metal case of desktop pcs causing high level noise to be emitted from the pc body furthermore they use many connection cables which also emit noise in most cases transmission signals to the lcd are lvdss low voltage differential signals since the lvdss are high-speed signals containing
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!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 3 example of noise suppression for usb s noise suppression content for usb usb s support three types of transmission modes depending on the function of the connected device ls low speed 1.5mbps fs full speed 12mbps and hs high speed 480mbps in order to suppress noise emission without deforming the signal waveform it is necessary to take noise suppressing measures suitable for individual transmission modes for noise suppression in the ls/fs mode chip ferrite bead blm18bb121sn1 or common mode choke coil dlp31sn121sl2 should be mounted on the signal line and the blm pg series chip ferrite bead should be mounted on the power supply a
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!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 example of noise suppression in cd-rom drives 4 installing emi filters on the headphone output port to suppress noise in the headphone output port it is important to minimize the gnd s noise level of the port the pcb s gnd and metal case are screwed together to make a low impedance connection at high frequency the nfm21c series chip emifil® capacitor is then installed on the headphone lines more effective noise suppression can be achieved by also installing blm series chip ferrite bead on the lines shield case pc board chip emifil® nfm21cc102r1h3 1000pf screwed chip ferrite bead blm18ag221sn1 220 at 100mhz headphone cable 4 install
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!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 5 example of noise suppression in dvd players improving the shielding the size of the opening in the metal case affects the shielding effects as the opening becomes larger the shielding effect decreases it is best if larger openings are divided into multiple smaller openings making each opening as small as possible with the objective of making the longest part of the opening as small as possible opening connectors poor example opening is large opening opening connectors good example opening is small 5 installing emi filters on interface cable ports when noise is conducted to the cable the cable will radiate high noise levels to s
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!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 example of noise suppression in printers 6 installing emi filters on the clock line clock signals generate high frequency noise noise and signal frequencies may be close to each other therefore an emi filter with high and steep attenuation is used such as the nfw31s series chip emifil® for signal lines or the blm b series chip ferrite bead for high-speed signal lines noise caused by transient currents is also generated on the power supply line therefore a chip ferrite bead is installed as well as a by-pass capacitor to suppress noise on the power supply line chip ferrite bead blm18pg300sn1 30 at 100mhz vcc chip ferrite bead blm18p
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!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 7 example of noise suppression in fax machines example of effects produced when installing emi filters on the clock lines noise suppression effects produced when installing the emi filter on the data clock lines before measure 60 50 noise level dbµv/m 40 30 before measure 20 10 30 84 138 192 246 300 frequency mhz when the emi filter for signal line is mounted to a clock line and the chip ferrite bead inductor is mounted to a dc power supply line 60 chip ferrite bead blm18bd102sn1 1000 typ at 100mhz chip emifil® for signal lines nfw31sp107x1e4 cut-off frequency 100mhz noise level dbµv/m 7 50 40 22 cpu 30 37mhz clock 20 10 30 84 138
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!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 example of noise suppression for car navigators 8 installing emi filters on the clock lines high frequency clock signals generate high frequency noise noise and signal frequencies may be close to each other therefore an emi filter with high and steep attenuation is used such as the nfw31s series chip emifil® for signal lines or the blm b series chip ferrite bead for high-speed signal lines noise caused by transient currents is also generated on the power supply line therefore a chip ferrite bead is installed as well as a by-pass capacitor to suppress noise on the power supply line chip ferrite bead blm21pg300sn1 30 at 100mhz vcc c
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!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 9 example of noise suppression in ac power supplies noise tendencies in switching power supplies newer switching power supplies tend to have a high switching frequency that generates high levels of noise noise is especially strong in the several hundred khz frequency range close to the switching frequency the figure below shows an example of measured mains terminal interference voltage in this example noise of 500khz or less frequency is strongly generated when this noise is broken down into common mode and differential mode components it is found that the noise consists mainly of differential mode components newer switching power
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!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 10 example of noise suppression in mobile phones noise emission status when noise from the base band section flows into rf section sensitivity suppression occurs resulting in ber bit error rate deterioration mobile phone base band section typically the base band ic controls various signals such as voice signal and lcd signal the base band ic is a significant noise source because it operates at a high-speed and connects many data lines if such noise flows into the rf section through the data line or power/gnd line sensitivity suppression occurs resulting in ber bit error rate deterioration ant base band ic lcd panel rf chip set rf
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!note please read rating and !caution for storage operating rating soldering mounting and handling in this pdf catalog to prevent smoking and/or burning etc this catalog has only typical specifications therefore you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering c35e.pdf 04.10.8 note 1 export control for customers outside japan murata products should not be used or sold for use in the development production stockpiling or utilization of any conventional weapons or mass-destructive weapons nuclear weapons chemical or biological weapons or missiles or any other weapons for customers in japan for products which are controlled items subject to the foreign exchange and foreign trade law of japan the export license specified by the law is required for export 2 please contact our sales representatives or product engineers before using the products in this catalog for the applications listed below which req
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