愛(ài)普生GPS定位器差分晶振Q3805CA00004400，隨著高科技的發(fā)展以及智能產(chǎn)品的推出，針對(duì)與GPS定位器專用晶振，可穿戴智能等一些電子產(chǎn)品逐步成為當(dāng)今智能電子產(chǎn)品的主流方案。而這些智能電子產(chǎn)品主板上需要用到晶振也越來(lái)越廣泛,就好比GPS定位器來(lái)說(shuō) 最常用到的晶振就是愛(ài)普生的EG-2121CA石英晶體振蕩器，編碼Q3805CA00004400，頻率75.000000兆赫，輸出WaveLV-PECL，電源電壓2.38 ~ 2.62 V，尺寸(LxWxH)7.00 x 5.00 x 1.20 mm，工作溫度0至+70°C，頻率公差±100ppm，額外的OptionsN /OSC TypeClock OSC，這款GPS定位器晶振是一款微型封裝，具備低損耗，低抖動(dòng)，高品質(zhì)，高精度特性,對(duì)于GPS定位器來(lái)說(shuō)，都是十分合適,選擇一款合適GPS定位器晶振其對(duì)頻率精度,穩(wěn)定性和體積要求較高。

Product Number	Model	Frequency	LxWxH	差分晶振	Supply Voltage	Ope Temperature
Q3805CA00004000	EG-2121CA	156.250000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00004300	EG-2121CA	62.500000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00004400	EG-2121CA	75.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00004600	EG-2121CA	161.132800 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00004700	EG-2121CA	156.250000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	-5 to 85 °C
Q3805CA00004800	EG-2121CA	100.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00004900	EG-2121CA	350.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00005000	EG-2121CA	175.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00005100	EG-2121CA	400.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00005200	EG-2121CA	156.250000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	-5 to 85 °C
Q3805CA00005300	EG-2121CA	100.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	-5 to 85 °C
Q3805CA00005400	EG-2121CA	100.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00005500	EG-2121CA	159.375000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00005600	EG-2121CA	311.040000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	-5 to 85 °C
Q3805CA00005700	EG-2121CA	175.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00005800	EG-2121CA	350.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00005900	EG-2121CA	125.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00006000	EG-2121CA	312.500000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00006100	EG-2121CA	156.250000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C
Q3805CA00006200	EG-2121CA	100.000000 MHz	7.00 x 5.00 x 1.20 mm	LV-PECL	2.375 to 2.625 V	0 to 70 °C

愛(ài)普生GPS定位器差分晶振Q3805CA00004400，有源晶振不需要DSP的內(nèi)部振蕩器，信號(hào)質(zhì)量好，比較穩(wěn)定，而且連接方式相對(duì)簡(jiǎn)單（主要是做好電源濾波，通常使用一個(gè)電容和電感構(gòu)成的PI型濾波網(wǎng)絡(luò)，輸出端用一個(gè)小阻值的電阻過(guò)濾信號(hào)即可），不需要復(fù)雜的配置電路。

有源晶振引腳定義，也就是說(shuō)通常的接法：一腳懸空，二腳接地，三腳接輸出，四腳接電壓。相對(duì)于無(wú)源晶體，有源晶振的缺陷是其信號(hào)電平是固定，需要選擇好合適輸出電平，靈活性較差，而且價(jià)格高。