CN2932830Y - SD card type FM receiving device - Google Patents
SD card type FM receiving device Download PDFInfo
- Publication number
- CN2932830Y CN2932830Y CN 200620116566 CN200620116566U CN2932830Y CN 2932830 Y CN2932830 Y CN 2932830Y CN 200620116566 CN200620116566 CN 200620116566 CN 200620116566 U CN200620116566 U CN 200620116566U CN 2932830 Y CN2932830 Y CN 2932830Y
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- China
- Prior art keywords
- card
- pin
- card type
- circuit board
- receiving system
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- Expired - Fee Related
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- 239000013078 crystal Substances 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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Abstract
An SD card type FM receiver relates to an FM receiver, in particular to an SD card type FM receiver. The receiving device comprises a shell (1), wherein a circuit board (2) is arranged in the shell (1), a receiving chip (3) is installed on the circuit board, and a crystal oscillator (4), a resistor (5), a capacitor (6) and a diode (7) are arranged on the periphery of the receiving chip (3) and correspond to the terminal pin of the chip. The utility model discloses improve to FM radio reception part size. The FM radio part is arranged in the structure of the SD card. This kind of new and improved circuit structure allows the SD cassette that brings on playback devices such as MP3 can be compatible normal SD card, MMC card and the utility model discloses a FM radio card.
Description
Technical field
The utility model relates to the FM receiving system, particularly SD card type FM receiving system.
Background technology
FM broadcasting is a very mature technique, being applied to all over the world by wide model in preceding half a century.It can send information to mass audience reliably with lower price, acceptable sound quality.So the FM broadcast receiver almost is integrated among the various forms of consumption electronic products.Up to now, all FM radio functions all are that the mode with the standalone feature module is fixedly mounted among the equipment.In other words, when increasing the FM radio function in the consumption electronic product, all be that whole FM function of radio receiver circuit is fixedly mounted in this consumption electronic product, become whole indivisible some.But along with miniaturization, the diversification of existing digital product, the FM radio function is fixed on that to become indivisible part in the audio-frequence player device undesirable.
Summary of the invention
The purpose of this utility model is to provide a kind of FM radio reception partly is installed in SD card type FM receiving system in the SD card structure.
The purpose of this utility model can realize like this, design a kind of SD card type FM receiving system, comprise housing, be provided with circuit board in the described housing, receiving chip is installed on the circuit board, is required to be provided with crystal oscillator, resistance, electric capacity, diode at the end pin of the peripheral corresponding chip of receiving chip.
Radio reception partly improves the utility model at FM.FM radio reception partly is placed in the SD card structure.This improvement allow on the playback equipment such as MP3 with the SD deck can compatible FM radio reception card.
Description of drawings
Fig. 1 is the schematic diagram of the circuit board section of the utility model preferred embodiment.
Fig. 2 is the schematic diagram of the circuit board section of the utility model preferred embodiment.
Fig. 3 is the schematic diagram of the housing of the utility model preferred embodiment.
Fig. 4 is the electrical schematic diagram of one of the utility model preferred embodiment.
Embodiment
The utility model will be further described below in conjunction with embodiment.
As Fig. 1, shown in Figure 3, a kind of SD card type FM receiving system comprises housing 1, is provided with circuit board 2 in the described housing 1, receiving chip 3 is installed on the circuit board, is required to be provided with crystal oscillator 4, resistance 5, electric capacity 6, diode 7 at the end pin of the peripheral corresponding chip of receiving chip 3.Utilize the reasonable distribution mode of main components and parts on circuit board, FM is received module be placed in the SD/MMC card size shell.
As Fig. 2, shown in Figure 3, described housing 1 is of a size of (30～31) * (21.5～23) * (1.9～2.1) millimeter, and housing wall thickness D1 is equal to or less than 0.3 millimeter; The height of described chip 3, crystal oscillator 4, resistance 5, electric capacity 6, diode 7 is less than 1.1 millimeters, and the thickness D4 of circuit board 2 and components and parts stack is less than 1.4 millimeters.
In the present embodiment, main components and parts are receiving chips 3 of FM.This chips can be selected the TEA5767HN as PHILIPS for use.It is the core of whole design, and overall height is 1.0MM.The important components and parts of next are crystal oscillator 4, and selected frequency is 32.768KHZ.This must be earlier with the thinnest a kind of, can make it highly be lower than receiving chip 3.In the used components and parts, at present the highest with the height of one group of electrochemical capacitor, even minimum element also reaches 1.1MM.So thick (height) that components and parts allow degree must be with this as adjusting the limit.
The thickness D3 that another factor that influences this receiver module thickness is a circuit board 2.The thinnest high-strength F R4 circuit board is that 0.3MM is thick at present.On circuit board, each components and parts all must be placed in one side to reduce gross thickness.
The thickness D1 of plastic casing, upper and lower covers respectively is 0.3MM, altogether 0.6MM.So if with upper and lower cover, circuit board and the thickest components and parts stack, gross thickness is 2.0MM, is less than the standard 2.1MM of SD card slightly.Stay 0.1MM as allowable tolerance.D2 is that shell is removed the height of outer casing thickness on one side.
Fig. 3 is the schematic diagram of housing.Wherein go up lower cover 11 and 12 by injection molded production.Its thickness D1 can not surpass 0.3MM, and the space of maximum is provided for the cavity 13 of centre.So its total height of FM module (comprising FM receiver module+circuit board) that can place in the cavity 13 can reach 1.5MM.
Described housing also is provided with filler in the 1 formed inner space 13.After FM radio reception circuit was placed in the cavity 13 fully, its remaining space can select for use filler to fill up to increase integral intensity, further protective circuit and components and parts.Filler is the filler that does not hinder the filler of heat radiation or help to dispel the heat.
Because a large amount of portable consumer electronic products all possess the SD/MMC card slot, the utility model becomes another optional equipment of SD/MMC slot.
Though this design has been a FM receiving card, but still need the support of some ancillary equipment.These ancillary equipment have comprised external antenna, power supply, power amplifier and loud speaker or earphone.These equipment all are arranged in the corresponding consumption electronic product, and they all will be by the SD deck, existing contact links to each other with FM receiving card on the SD card.
Because some character of exporting into signal of FM radio reception card and SD card has suitable difference, when taking contact on the SD card, must match cautiously signal so go into when the output of FM.The 8th, 9 pin positions of described card base position are the end pin of stereosonic two output channels of FM, and the 6th pin position is ground wire and antenna duplexer pin position.
The signal of SD card and mmc card turnover is digital signal fully, but the FM card then is mixed with the FM antenna input of simulation or the output signal of audio frequency.So select for use two pin positions 8 of on the SD/MMC card, the most seldom using and 9 to be stereosonic two output channels of FM.Because this is the path of audio signal, so the peripheral circuit that cooperates should select for use a pair of analog switch to shunt this two signals.But analog switch must be able to provide enough passband frequency ranges, to prevent the being distortion that bandwidth causes inadequately.
In addition, the 6th pin is chosen as ground wire and the FM aerial signal is shared.At this, aerial signal will be led to the inlet of FM radio reception aircraft antenna through High frequency filter.Could guarantee the integrality of ground wire like this, reduce noise.
As shown in Figure 4, at receiving chip 3, adopt the TEA5767HN of PHILIPS in the present embodiment, 16,17 pin are connected with the crystal resonator that capacitor C 68, C69 form with crystal oscillator X2; 8 pin of receiving chip are the data pin, and 9 pin are clock, and 22,23 pin are the output of FM left and right acoustic channels; Filter input 35,37 pin that the antenna input is formed through filter and capacitor C 50, C51, the inductance L 9 of capacitor C 49, resistance R 43 compositions; 6 pin are ground connection.
Claims (5)
1, a kind of SD card type FM receiving system, comprise housing (1), it is characterized in that: be provided with circuit board (2) in the described housing (1), receiving chip (3) is installed on the circuit board, is required to be provided with crystal oscillator (4), resistance (5), electric capacity (6), diode (7) at the end pin of the peripheral corresponding chip of receiving chip (3).
2, SD card type FM receiving system according to claim 1 is characterized in that: described housing (1) is of a size of (30～31) * (21.5～23) * (1.9～2.1) millimeter, and the housing wall thickness is equal to or less than 0.3 millimeter; The height of described chip (3), crystal oscillator (4), resistance (5), electric capacity (6), diode (7) is less than 1.1 millimeters, and the thickness of circuit board (2) and components and parts stack is less than 1.4 millimeters.
3, SD card type FM receiving system according to claim 1 is characterized in that: on the card base position of described SD card type FM receiving system the end pin that 2 pin positions are stereosonic two output channels of FM is set, a pin position is ground wire and antenna duplexer pin position.
4, SD card type FM receiving system according to claim 3, it is characterized in that: the 8th, 9 pin positions of described card base position are the end pin of stereosonic two output channels of FM, the 6th pin position is ground wire and antenna duplexer pin position.
5, SD card type FM receiving system according to claim 2, it is characterized in that: described housing (1) also is provided with filler in the formed inner space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620116566 CN2932830Y (en) | 2006-06-14 | 2006-06-14 | SD card type FM receiving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620116566 CN2932830Y (en) | 2006-06-14 | 2006-06-14 | SD card type FM receiving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2932830Y true CN2932830Y (en) | 2007-08-08 |
Family
ID=38349319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620116566 Expired - Fee Related CN2932830Y (en) | 2006-06-14 | 2006-06-14 | SD card type FM receiving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2932830Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109904647A (en) * | 2017-12-08 | 2019-06-18 | 西部数据技术公司 | Memory card pin layout for avoiding conflicting in combination card connector slot |
-
2006
- 2006-06-14 CN CN 200620116566 patent/CN2932830Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109904647A (en) * | 2017-12-08 | 2019-06-18 | 西部数据技术公司 | Memory card pin layout for avoiding conflicting in combination card connector slot |
| CN109904647B (en) * | 2017-12-08 | 2020-08-11 | 西部数据技术公司 | Memory card pin layout for avoiding collisions in combo card connector slot |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070808 Termination date: 20120614 |