[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-183585-105":59,"doc-detail-183585-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","lc7210-tuning-circuit-of-psl-electronic-tuning-system","LC7210 - Tuning Circuit of PSL² Electronic Tuning System","","LC7210 presents the tuning circuitry used in a PSL² electronic tuning system for FM/AM radio reception. The design supports multiband reception with micro-computer control and provides three tuning methods: auto search, preset, and manual. Frequency control is implemented via a PLL synthesizer mode, an SL² voltage synthesizer auto-search mode, and S-curve AFC reception, including a local oscillation frequency counter. Low harmonic interference is achieved through a low 32 kHz reference oscillator, enabling fine frequency tuning and stable IF offset adjustment.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/lc7210-tuning-circuit-of-psl-electronic-tuning-system/183585/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/lc7210-tuning-circuit-of-psl-electronic-tuning-system/183585.png","ImageObject",300,407,{"name":92,"@type":93},"Aditya","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-20","2026-09-02",true,{"@type":102,"interactionType":103,"userInteractionCount":44},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What tuning methods are supported by the LC7210 PSL² electronic tuning system?","Question",{"text":112,"@type":113},"It supports three tuning methods: auto search, preset, and manual tuning.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How is frequency control implemented in the system?",{"text":117,"@type":113},"Frequency control uses multiple modes, including a PLL synthesizer mode, an SL² voltage synthesizer auto-search mode, and an S-curve AFC reception mode with a local oscillation frequency counter.",{"name":119,"@type":110,"acceptedAnswer":120},"Why is harmonic interference on the FM band reduced?",{"text":121,"@type":113},"Harmonic interference on the FM band is reduced by using a low reference oscillation frequency of 32 kHz.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},183585,1788353266,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":44,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":81,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":129,"read_time":39},962085564549,"https://ap-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","LC7210  \nTUNING CIRCUIT OF PSL²ELECTRONICTUNING SYSTEM  \n# Features\n\n■ Multiband reception(FM,MW,LW/FM,SW1,SW2/TV,FM,MW,etc.)is available with micro-computer control.  \n■ 3 tuning methods of auto search,preset,manual.  \n■ Tuning control of PLL synthesizer mode,SL²voltage synthesizer auto search mode,S curveAFC reception mode,local oscillation frequencycount mode.  \n■ Little harmonic interference to FM band due tolow reference oscillation frequency of 32kHz.  \n# Functions\n\n■ SL²auto search control.  \n■ PLL control(Number of frequency divisionsFM:39999 max.,AM:3999 max.).  \n■ Analog switch for S curve AFC.  \nLC7220 series offer a choice of the following types according to destination and package.  \n*:AM(1)or AM(2)is selected by changing pin connection.  \n■ Package Number:3025B(LC7220,7221,7222,7223),3026B(LC7225,7226,7227)  \nC-mos LSI  \n■ With FM-IF ceramic filter variation adjustingfunction provided(±150kHz/10kHz step fineadjustment),multirank ceramic filter can beused.  \n■ Because of S curve AFC reception,PLL controlstep can be made small(10kHz step)by lower-ing comparison frequency (fref=0.1kHz:FMband)without regard to CN ratio at the time ofPLL operation.  \n■ +5V single power supply,C-MOS process,28-pin DIP.  \n■ Local oscillation frequency counter(Number ofcounts FM,  AM:  39999 max./10ms).  \n■ Data generation for FM band IF offset fineadjustment (5 bits).  \nLC7220 series are PLL frequency synthesizer C-MOS LSls designed for use in FM/AM 2-radio band radios.By using in conjuction with LB3500(1/8 frequency division prescaler),electronic tuning system with 18-dotanalog frequency display can be formed.  \n\n| Type No    | Package   | Area   | Radio  \u003Cbr>band   | Frequency   | Step   | fref   | IF   |\n| --- | --- | --- | --- | --- | --- | --- | --- |\n| LC7220  \u003Cbr>LC7225   | DIP42S  \u003Cbr>QIP64   | U.S.A.   | FM   | MHz  \u003Cbr>87.5～108.1   | 200 kHz   | 6.25 kHz   | +10.70,+10.75 MHz   |\n|  |  |  | AM(1)*   | kHz  \u003Cbr>520～1610   | kHz  \u003Cbr>10   | 10 kHz   | +450 kHz   |\n|  |  |  | AM(2)*   | kHz  \u003Cbr>522～1611   | 9 kHz   | 9 kHz   | +450 kHz   |\n| LC7221  \u003Cbr>LC7226   | DIP42S  \u003Cbr>QIP64   | Japan   | FM   | MHz  \u003Cbr>76.0～90.0   | 100  \u003Cbr>kHz   | 6.25 kHz   | -10.70,-10.65 MHz   |\n|  |  |  | AM   | 522~1611  \u003Cbr>kHz   | 9  \u003Cbr>kHz   | 9kHz   | +450 kHz   |\n| LC7223   | DIP42S   | Japan   | FM   | MHz  \u003Cbr>76.0 to 90.0   | 100 kHz   | 6.25 kHz   | -10.70,-10.65MHz   |\n|  |  |  | AM   | kHz  \u003Cbr>522 to 1629   | 9  \u003Cbr>kHz   | 9 kHz   | +450kHz   |\n| LC7222  \u003Cbr>LC7227   | DIP42S  \u003Cbr>QIP64   | Europe  \u003Cbr>(U.S.A.)   | FM   | 87.5~108.1  \u003Cbr>MHz   | 50 kHz   | 6.25 kHz   | +10.70,+10.75 MHz   |\n|  |  |  | AM(1)*   | kHz  \u003Cbr>520~1610   | kHz  \u003Cbr>10   | 10 kHz   | +450 kHz   |\n|  |  |  | AM(2)*   | 522~1611  \u003Cbr>kHz   | 9  \u003Cbr>kHz   | 9 kHz   | +450 kHz   |\n\nELECTRONIC TUNING SYSTEMS(monolithic integrated cirait)  \n\n| Type Number   | Page   | Case   |  |  | Circuit  \u003Cbr>Drawing  \u003Cbr>No.   | Circuit Functions &Applications   | Main Specifications   |\n| --- | --- | --- | --- | --- | --- | --- | --- |\n|  |  | Peckage   | Pins   | Package  \u003Cbr>No.   |  |  |  |\n| LC7210   | 222   | DIP   | 28   | 3012A   | 4053   | PSL²Electronic Tuning System   | Kit available with controller microoomputer,preset memory   |\n| LC7220  \u003Cbr>LC7221  \u003Cbr>LC7222  \u003Cbr>LC7223  \u003Cbr>LC7225  \u003Cbr>LC7226  \u003Cbr>LC7227   | 222  \u003Cbr>222  \u003Cbr>222  \u003Cbr>222  \u003Cbr>222  \u003Cbr>222  \u003Cbr>222   | DIP  \u003Cbr>DIP  \u003Cbr>DIP  \u003Cbr>DIP  \u003Cbr>QIP  \u003Cbr>QIP  \u003Cbr>QIP   | 42S  \u003Cbr>42S  \u003Cbr>42S  \u003Cbr>42S  \u003Cbr>64  \u003Cbr>64  \u003Cbr>64   | 3025B  \u003Cbr>3025B  \u003Cbr>3025B  \u003Cbr>3025B  \u003Cbr>3026B  \u003Cbr>3026B  \u003Cbr>3026B   | 4054  \u003Cbr>4054  \u003Cbr>4054  \u003Cbr>4054  \u003Cbr>4054  \u003Cbr>4054  \u003Cbr>4054   | PLL Electronic Tuning System for FM/AM Radio  \u003Cbr>PL Electronic Tuning Sysetm for FM/AM Radio  \u003Cbr>PL Electronic Tuning Sysetm for FM/AM Radio  \u003Cbr>PLL Electronic Tuning Sysetm for FM/AM Radio  \u003Cbr>PLL Electronic Tuning Sysetm for FM/AM Radio  \u003Cbr>PLL Electronic Tuning Sysetm for FM/AM Radio  \u003Cbr>PLL Electronic Tuning Sysetm for FM/","cbCaibCd9Cnvkwfw","https://ap.wps.com/l/cbCaibCd9Cnvkwfw","pdf",195038,"English","# Features\n## Multiband reception and tuning methods\n## PLL/SL²/S-curve AFC/local oscillator functions\n# Functions\n## SL² auto search control\n## Frequency division and analog switch\n# LC7220 series overview\n## Package options and selection by pin connection\n## Main specifications and FM/AM tuning behavior\n# Electronic tuning systems and related ICs\n## LC7210/LC7220 variants table\n## Direct PLL tuning system components\n## LB3500 1/8 prescaler","[{\"question\":\"What tuning methods are supported by the LC7210 PSL² electronic tuning system?\",\"answer\":\"It supports three tuning methods: auto search, preset, and manual tuning.\"},{\"question\":\"How is frequency control implemented in the system?\",\"answer\":\"Frequency control uses multiple modes, including a PLL synthesizer mode, an SL² voltage synthesizer auto-search mode, and an S-curve AFC reception mode with a local oscillation frequency counter.\"},{\"question\":\"Why is harmonic interference on the FM band reduced?\",\"answer\":\"Harmonic interference on the FM band is reduced by using a low reference oscillation frequency of 32 kHz.\"}]","LC7210 - Tuning Circuit of PSL² Electronic Tuning System | PDF"]