【正文】 al frequency modulation, the use is more troublesome, moreover, because the receiving sensitivity is not high, receives the frequency band is narrow. What this design uses is the TEA5767 chip, it is promotes by PHILIPS Corporation in view of the low voltage application single chip digit harmonious FM stereophonic receiver chip. In the TEA5767 chip integrated the plete IF frequency selection and the frequency discrimination system, only need the very few low cost periphery part, be possible to realize the FM radio39。s and the attention by the extremely high performance price, therefore the application is very broad, the development is very quick. Monolithic integrated circuit39。另外，它具有高性能的 RF、 AGC 電路，其接收靈敏度高；參考頻率選擇靈活；可實(shí)現(xiàn)自動搜臺。本設(shè)計(jì)采用的是TEA5767 芯片，它是由 PHILIPS 公司推出的針對低電壓應(yīng)用的單芯片數(shù)字調(diào)諧 FM 立體聲收音機(jī)芯片。例如，本文所要論述的通過單片機(jī)來控制 TEA5767 芯片及 驅(qū)動 LCD 液晶顯示 實(shí)現(xiàn) FM 收音并顯示頻率 。以前采用硬件電路實(shí)現(xiàn)的大部分控制功能，正在用單片機(jī)通過軟件方法來實(shí)現(xiàn)。我們可以開發(fā)利用單片機(jī)系統(tǒng)以獲得很高的經(jīng)濟(jì)效益 。正因?yàn)閱纹瑱C(jī)有如此多的優(yōu)點(diǎn)，因此其應(yīng)用領(lǐng)域之廣，幾乎到了無孔不入的地步。I 小信號調(diào)頻收音機(jī)電路的設(shè)計(jì) 摘要 單片機(jī)自 從 20 世紀(jì) 70 年代問世以來，以極其高的性能價格比受到人們的重視和關(guān)注，所以應(yīng)用很廣，發(fā)展很快。單片機(jī)的特點(diǎn)是體積小、集成度高、重量輕、抗干擾能力強(qiáng)，對環(huán)境要求不高，價格低廉，可靠性高，靈活性好，開發(fā)較為容易。在我國，單片機(jī)已被廣泛地應(yīng)用在工業(yè)自動化控制、自動檢測、智能儀表、智能化家用電器、航空航天系統(tǒng)和和國防軍事、尖端武器等各個方面。更重要的意義是單片機(jī)的應(yīng)用改變了控制系統(tǒng)傳統(tǒng)的設(shè)計(jì)思想和方法。這種以軟件結(jié)合硬件或取代硬件并能提高系統(tǒng)性能的控制技術(shù)稱為微控制技術(shù)。 現(xiàn)在人們常使用的收音機(jī)為手動調(diào)頻收臺，使用較為麻煩，而且由于接收靈敏度不高，所接收的頻段較窄。 TEA5767 芯片內(nèi)集成了完整的 IF 頻率選擇和鑒頻系統(tǒng) ，只需很少的低成本外圍元件，就可實(shí)現(xiàn) FM 收音機(jī)II 的全部功能。 關(guān)鍵詞 ： 單片機(jī) FM 收音機(jī) TEA5767 III Abstract The singlechip has e out since the 1970s, pared to is valued people39。s characteristic is the volume is small, the integration rate is high, the weight is light, antijamming ability, is not high to the environment request, the low in price, the reliability is high, the flexibility is good, the development is easier. Because just the monolithic integrated circuit has so many merits, therefore broad its application domain, arrived at the situation which nearly seizes every opportunity. In our country, the monolithic integrated circuit widely has been applied in the industrial automation control, the automatic detection, the intelligent measuring appliance, the intellectualized domestic electric appliances, the aerospace system and with the national defense military, the advanced weapon and so on each aspect. We may develop using the monolithic integrated circuit system obtain the very high economic efficiency. A more vital significance was monolithic integrated circuit39。s plete function. Moreover, it has high IV performance RF, the AGC electric circuit, its receiving sensitivity is high。 May realize searches for Taiwan automatically. Keywords ： singlechip ,FM radio , TEA5767 V 目錄 摘要 ................................................................................................................. I Abstract .......................................................................................................III 目錄 ................................................................................................................V 前言 ............................................................................................................. VII 1 FM 收音機(jī)概述 .......................................................................................... 2 發(fā)射系統(tǒng)的簡單概述 ...................................................................... 2 接收系統(tǒng)的簡單概述 ...................................................................... 2 典型數(shù)字式收音機(jī)模塊組成 ........................................................... 3 收音機(jī)的調(diào)制方案簡單介紹和該方案原理簡單介紹 .................. 4 收音機(jī)的調(diào)制方案簡單介紹 ................................................... 4 調(diào)頻廣播收音機(jī)的原理 ........................................................... 6 2 方案論證與硬件選擇 ................................................................................ 8 本方案涉及到的硬件選擇 .............................................................. 8 無線芯片的選擇 ............................................................................... 8 TEA5767 方案選擇 .................................................................... 9 TEA5767 的 IIC 總線 ................................................................ 9 控制模塊 ........................................................................................... 9 STC89C52 外形和引腳 ........................................................... 10 STC89C52 主要功能 ............................................................... 11 STC89C52 的控制電路 ........................................................... 11 功放模塊 ......................................................................................... 14 TDA2822 基 本信息 ......................................................... 14 TDA2822 工作特點(diǎn) .............................................................. 16 液晶顯示頻率 ................................................................................. 17 Nokia5110 液晶簡單簡介 ........................................................ 17 Nokia5110 液晶特點(diǎn) ................................................................ 19 使用 Nokia5110 液晶理由 ....................................................... 20 SPI 總線 .................................................................................... 20 電源模塊 ......................................................................................... 22 VI 3 TEA5767 芯片介紹 .................................................................................. 23 TEA5767 芯片簡介 ........................................................................ 23 TEA5767 寄存器描述 .................................................................... 25 FM 模塊介紹 .................................................................................. 30 I2C 總線簡介 .................................................................................. 31 4 硬件電路設(shè)計(jì) .......................................................................................... 35 微控制器模塊 ..........