首頁晶振行業(yè)動(dòng)態(tài) IQD的CMOS、HCMOS和ACMOS振蕩器LFSPXO070975REEL之間的區(qū)別
IQD的CMOS、HCMOS和ACMOS振蕩器LFSPXO070975REEL之間的區(qū)別
來源：http://m.py519.com 作者：億金電子 2024年03月08
IQD的CMOS、HCMOS和ACMOS振蕩器LFSPXO070975REEL之間的區(qū)別
CMOS與HCMOS與ACMOS–振蕩器的歷史教訓(xùn)
本博客旨在揭開石英晶體振蕩器技術(shù)的秘密，闡明CMOS、HCMOS和ACMOS之間的區(qū)別，揭示使它們?cè)陔娮与娐肥澜缰懈骶咛厣莫?dú)特特征。
CMOS（互補(bǔ)金屬氧化物半導(dǎo)體）最早出現(xiàn)于1963年，基本上取代了TTL技術(shù)（晶體管晶體管邏輯）。TTL邏輯的問題在于，保持線路高電平需要功耗。而CMOS石英晶振實(shí)際上不使用功率來保持高或低狀態(tài)（盡管其操作較慢）；相反，在狀態(tài)之間切換時(shí)會(huì)消耗功率。在振蕩器中，輸出在半個(gè)周期內(nèi)為高電平，在另一半周期內(nèi)為低電平，這意味著在任何1秒鐘內(nèi)，輸出只有0.5秒為高電平。實(shí)際上，輸出在每個(gè)時(shí)鐘周期從高到低切換兩次，這意味著26MHz振蕩器每秒切換4200萬次。
到20世紀(jì)90年代，CMOS已經(jīng)取代TTL成為最常見的邏輯形式，顯然TTL即將過時(shí)。在通往主導(dǎo)地位的旅程中，CMOS有源晶振經(jīng)歷了幾次迭代。首先是高速版本的HCMOS和高級(jí)版本的ACMOS。此外，回到90年代，最常見的電源電壓仍然是5V，但3.3V是新的未來（有點(diǎn)像今天的1.8V），這不可避免地導(dǎo)致了低壓CMOS、LVCMOS的出現(xiàn)。
當(dāng)時(shí)，區(qū)分這些不同類型的CMOS貼片振蕩器非常重要，因?yàn)樗鼈兌季哂胁煌碾妷弘娖健⒉煌拈_關(guān)速度，并且可以驅(qū)動(dòng)不同數(shù)量的功率到下一個(gè)器件的輸入端。因此，設(shè)計(jì)工程師必須將振蕩器的輸出與產(chǎn)品下一級(jí)的輸入相匹配。謝天謝地，現(xiàn)在世界變得簡單了。一切都是兼容的，它們都可以被歸類為CMOS區(qū)分所有不同的選項(xiàng)不再有幫助。出于這個(gè)原因，我們只說“CMOS輸出”，以避免任何混淆。
當(dāng)然，如果CMOS是唯一的輸出選項(xiàng)，生活將會(huì)很簡單……然而，也存在替代方案:對(duì)于單輸出振蕩器，這包括:限幅正弦波或正弦波；對(duì)于雙輸出振蕩器：LVPECL、LVDS或偶爾HSCL差分晶振。
IQD的CMOS、HCMOS和ACMOS振蕩器LFSPXO070975REEL之間的區(qū)別
CMOS vs HCMOS vs ACMOS – A History Lesson in Oscillators
CMOS (Complementary Metal Oxide Semiconductor) first came about in 1963, and essentially replaced TTL Technology (Transistor Transistor Logic). The problem with TTL Logic was that it took power to hold a line high. Whereas CMOS uses virtually no power to hold a high or low state (although it is slower to operate); power is instead consumed when switching between the states. In an oscillator, the output is high for half the cycle and low for the other half, meaning for any 1 second, it is high for only 0.5 seconds. In reality, the output switches from high to low and back twice for every clock cycle, that means a 26MHz oscillator switches 42million times a second.
By the 1990’s CMOS had replaced TTL as the most common form of logic and TTL was obviously going to become obsolete. Along the journey to its dominance, CMOS went through a few iterations. Firstly, HCMOS, the High Speed version, and ACMOS, the Advance version. Additionally, back in the 90’s the most common supply voltage was still 5V, but 3.3V was the new future (a bit like 1.8V is today), and this inevitably led to Low Voltage CMOS, LVCMOS.
Back then, it was important to differentiate between these different CMOS types because they all had different voltage levels, different switching speeds, and they could drive different amounts of power to the input of the next device. Therefore, a design engineer had to match the output of an oscillator to the input of the next stage of their product. Thankfully, the world is simpler now. Everything is compatible and they can all be classed as just CMOS; It’s no longer helpful to differentiate between all the different options. For that reason we just say “CMOS output” and avoid any confusion.
Of course, life would be simple if CMOS was the only output option… However, alternatives to exist: for single output oscillators this includes: clipped sine wave or sine wave, and for dual output oscillators: LVPECL, LVDS or occasionally HSCL
| 進(jìn)口晶振 | 型號(hào) | 頻率 | 頻率穩(wěn)定性 | 電壓 |
| LFSPXO064535REEL | IQXO-642 | 4.0MHz | ±30ppm | 1.8V |
| LFSPXO065833REEL | IQXO-640 | 8.0MHz | ±50ppm | 3.3V |
| LFSPXO070969REEL | IQXO-642 | 8.0MHz | ±50ppm | 1.8V |
| LFSPXO072774CUTT | IQXO-640 | 10.0MHz | ±50ppm | 3.3V |
| LFSPXO072774REEL | IQXO-640 | 10.0MHz | ±50ppm | 3.3V |
| LFSPXO059847CUTT | IQXO-640 | 12.0MHz | ±50ppm | 3.3V |
| LFSPXO059847REEL | IQXO-640 | 12.0MHz | ±50ppm | 3.3V |
| LFSPXO073768REEL | IQXO-642 | 12.0MHz | ±50ppm | 1.8V |
| LFSPXO066574CUTT | IQXO-640 | 20.0MHz | ±50ppm | 3.3V |
| LFSPXO066585REEL | IQXO-642 | 20.0MHz | ±50ppm | 1.8V |
| LFSPXO059848CUTT | IQXO-640 | 24.0MHz | ±50ppm | 3.3V |
| LFSPXO059848REEL | IQXO-640 | 24.0MHz | ±50ppm | 3.3V |
| LFSPXO066580CUTT | IQXO-642 | 24.0MHz | ±50ppm | 1.8V |
| LFSPXO073783REEL | IQXO-640 | 24.0MHz | ±30ppm | 3.3V |
| LFSPXO082137REEL | IQXO-642 | 24.0MHz | ±25ppm | 1.8V |
| LFSPXO059400REEL | IQXO-640 | 25.0MHz | ±50ppm | 3.3V |
| LFSPXO070975REEL | IQXO-642 | 25.0MHz | ±50ppm | 1.8V |
| LFSPXO073775REEL | IQXO-642 | 27.0MHz | ±50ppm | 1.8V |
| LFSPXO070959CUTT | IQXO-640 | 32.0MHz | ±50ppm | 3.3V |
| LFSPXO070982REEL | 貼片晶振 | 32.0MHz | ±50ppm | 1.8V |
| LFSPXO079160REEL | IQXO-640 | 32.0MHz | ±30ppm | 3.3V |
| LFSPXO065835REEL | IQXO-640 | 40.0MHz | ±50ppm | 3.3V |
| LFSPXO066581REEL | IQXO-642 | 40.0MHz | ±50ppm | 1.8V |
| LFSPXO070985REEL | IQXO-642 | 48.0MHz | ±50ppm | 1.8V |
| LFSPXO066575REEL | IQXO-640 | 50.0MHz | ±50ppm | 3.3V |
| LFSPXO066583CUTT | IQXO-642 | 50.0MHz | ±50ppm | 1.8V |
| LFSPXO066583REEL | IQXO-642 | 50.0MHz | ±50ppm | 1.8V |
| LFSPXO058071CUTT | IQXO-540 | 3.0MHz | ±50ppm | 3.3V |
| LFSPXO082146CUTT | IQXO-540 | 4.0MHz | ±25ppm | 3.3V |
| LFSPXO082164RL3K | IQXO-542 | 4.0MHz | ±25ppm | 1.8V |
| LFSPXO068241CUTT | IQXO-540 | 7.3728MHz | ±50ppm | 3.3V |
| LFSPXO068242CUTT | IQXO-540 | 8.0MHz | ±50ppm | 3.3V |
| LFSPXO068242REEL | IQXO-540 | 8.0MHz | ±50ppm | 3.3V |
| LFSPXO068242RL3K | IQXO-540 | 8.0MHz | ±50ppm | 3.3V |
| LFSPXO082147RL3K | IQXO-540 | 8.0MHz | ±25ppm | 3.3V |
| LFSPXO082166RL3K | IQXO-542 | 8.0MHz | ±25ppm | 1.8V |
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此文關(guān)鍵字： 石英晶體振蕩器
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