Ceramic Filters CERAFIL® Application Manual 08/06/2016 by Murata Manufacturing Co.,Ltd.

More catalogs by Murata Manufacturing Co.,Ltd. | Ceramic Filters CERAFIL® Application Manual 08/06/2016 | 24 pages | 2018-02-02

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Catalog Ceramic Filters CERAFIL® Application Manual 08/06/2016

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p11e.pdf note • please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 1 2015.12.25 1 types of filter rohs portable audio car audio tv vcr rke tpms wireless data communication mobile phone cordless phone 10.7mhz ○ ○ ○ ○ ○ ○ ○ ○ 2 ceramic discriminator 4.5mhz 5.5mhz 6.0mhz 6.5mhz 10.7mhz ceramic trap ceramic filter smd type 4.5mhz 5.5mhz 6.0mhz 6.5mhz ○ ○ ○ ○ ○ ○ ○ radio communication equipment hi-fi audio types of filter typical center frequency types of cerafil® and applicable

p11e.pdf note • please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 3 operating principles of cerafil® 2015.12.25 rohs cerafil® ceramic filter is a filter which uses a piezoelectric ceramics barium titanate ceramics lead-zirconate-titanate ceramics etc as an electrical-mechanical transducer and as a mechanical resonator it provides the electrical and the mechanical system simultaneously within a single element 3 1 what is piezoelectric effect? distortion takes place in the crystal lattice when a stress is applied upon it and the crystal group which has no symmetric center causes a polarization in addition to the distortion this phenomenon was found by the curie brothers in 1880 and is called the

p11e.pdf note • please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 2015.12.25 2 ‌symbols in the electrical circuit of the electrical-mechanical transducer and the equivalent circuit 3 the symbols as shown in fig 3-2 are used for the electricalmechanical transducer in an electrical circuit the equivalent circuit with two-terminal type transducer near the resonating point is shown in fig 3-3 even if the vibrating mode used is different each parameter can be considered as spring-pendulum shown in fig 3-4 two-terminal transducer three-terminal transducer fig 3-2 symbols in the electrical circuit for the transducer c0 the capacitance between the electrodes is called the parallel equivalent capacitance c1

note • please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 2 other terminologies 1 input/output impedance signifies the internal impedance value of the input and output side at the center frequency of cerafil ® and it is expressed in Ω it causes no problem even if the input and the output are used in reverse with cerafil ® since the input and the output impedance are in a symmetry of substantially the same value 4 2 impedance matching when connecting one electric circuit to another or a component to another or one electric circuit to a component the electric energy is supplied most efficiently from the signal source to the load if the signal source impedance and the load impedance are the same if

p11e.pdf note • please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 5 features of cerafil® 1 no peaking needed because cerafil® is employing a mechanical resonance it is almost unaffected by the surrounding circuits its characteristics do not deviate when it is implanted in the printed circuit and no adjustment is required 2 a very suitable component for miniaturization cerafil® is available in various forms for many applications cerafil® facilitates space savings and a low profile in your products 3 a very suitable component for integrated filters 5 10 there is a growing need for integrating the selective elements because the gain per stage is greater when ic is used in the amplifier when

note • please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 2 consideration for gain distribution the impedance of both input and output is symmetric and small it is necessary to consider the distribution in the circuit a resister is used for the impedance matching as described in section 6.1 and a certain d.c loss is caused by the resistors which reduces the gain this sometimes creates a problem if the set has no allowance for this loss the following countermeasures are available countermeasures 1 using cerafil® in the amplifier stage instead of using it in the interstage design the amplifier for the gain performance consideration 2 use in combination with ift for minimizing both matching loss and d.c loss

p11e.pdf note • please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 2015.12.25 7 ceramic trap cerafil® rohs 1 trap  as mentioned above ceramic filters pass only a particular frequency however a band eliminate filter b e f which blocks or attenuates a particular frequency is called a trap a sound trap for tv set is one famous example of b e f in a tv set a video signal is used in picture amplitude circuit after a video signal detection block a ceramic resonator is insert here and a trap circuit is formed in order to eliminate the sound signal involved in the video signal 2 ceramic trap cerafil®  three-terminal ceramic trap a three-terminal ceramic trap has a monolith structure formed from 2 ceramic

p11e.pdf note • please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 2015.12.25 2 detection methods 1 ratio detection m ratio detection is the most popular method in use at present let us introduce its simple operating principle as shown in fig 8-1 the voltage e1 and e2 applied to the diode d1 and d2 are composed of both the primary voltage v1 and a half of the secondary voltage v2 the voltage e1 and e2 are expressed in the equations as shown in fig 8-1 b by this high frequency voltage the rectified current l1 of diode d1 has voltage e1 generated at both ends of c3 and voltage e2 as well as e1 occurs at both ends of c4 moreover the voltage of both ends of r3 and r4 becomes e1+e2 2 since the voltage e1+e2 takes

p11e.pdf note • please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 2015.12.25 3 ceramic discriminator application in this chapter we will illustrate four applied circuits using our ceramic discriminator and their characteristic data they will be useful as circuits in small radios vics rke and so forth the advantage to this is that adjustment is not required in the if stage including the detection stage our murataʼs product manager will be happy to recommend the appropriate ceramic discriminator for use with your chosen ic cdscb10m7ga105a-r0 applications small radios headphone stereos etc cdscb10m7ga113-r0 applications small radios headphone stereos etc 0.1µ 36 2 35 3 34 4 33 5 32 tea5757hl philips 6

p11e.pdf note • please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 2015.12.25 4 correct use of ceramic discriminator accurate circuit values are required to obtain specified electrical characteristic in the case of input/output impedance mismatching or application to unsuitable ic it may cause characteristic shift to determine the appropriate ceramic discriminator and circuit condition for your specific application we recommend you contact a murata product specialist to help develop the circuit design 5 applied ic reference table for ceramic discriminator example cdscb 10m7 ① ② ga ③ 027 r0 ④ ⑤ ① product id ic manufacturer atmel infineon cdscb smd type panasonic ②

p11e.pdf 2015.12.25 cat no p11e-5 global locations for details please visit www.murata.com note 1 export control for customers outside japan no murata products should be used or sold through any channels for use in the design development production utilization maintenance or operation of or otherwise contribution to 1 any weapons weapons of mass destruction [nuclear chemical or biological weapons or missiles or conventional weapons or 2 goods or systems specially designed or intended for military end-use or utilization by military end-users 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 require especially high reliability for the prevention of defects which might directly damage a third