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??? ADA4939差分放大器專(zhuān)為驅(qū)動(dòng)當(dāng)今的14 bit 和16 bit 轉(zhuǎn)換器而優(yōu)化，在3.3 V單電源下的功耗低于120 mW，在70 MHz頻率下的無(wú)雜散動(dòng)態(tài)范圍(SFDR)達(dá)到82 dB。新款差分放大器提供單通道和雙通道版本，能驅(qū)動(dòng)高達(dá)16 bit分辨率的ADC，如ADI公司的AD9460與AD9461，也可以驅(qū)動(dòng)低功耗14 bit ADC，如AD9246。
??? ADA4939可以使用差分-差分配置或單端-差分配置。內(nèi)部共模反饋環(huán)路允許用戶獨(dú)立調(diào)整輸出共模電平，以與 ADC的輸入共模電壓匹配，同時(shí)實(shí)現(xiàn)良好的輸出平衡和偶次諧波抑制。
??? ADA4939特別適合通信應(yīng)用，例如，在高達(dá)100 MHz頻率使用低中頻（IF）與基帶信號(hào)處理的手機(jī)基站中，要求14 bit 和16 bit 的精度，雙通道ADA4939-2非常適合驅(qū)動(dòng)正交解調(diào)器方案中使用的雙ADC，在100 MHz提供-80 dB的低串?dāng)_" title="串?dāng)_">串?dāng)_，同時(shí)保證增益和相位匹配。
??? ADA4939采用ADI公司專(zhuān)有的硅鍺(SiGe)互補(bǔ)雙極工藝制造，具有極低的失真度，輸入電壓噪聲為2.3 nV/rt Hz，-3 dB帶寬為1.4 GHz (G=+2)，壓擺率為5000 V/μS。采用3.3 V~5 V電源電壓，工作溫度范圍為-40℃～+105℃。
供貨與報(bào)價(jià)
??? ADA4939-1與ADA4939-2現(xiàn)已批量供貨。ADA4939-1采用3 mm × 3 mm 16引腳LFCSP無(wú)鉛 封裝，雙通道ADA4939-2采用4 mm × 4 mm 24引腳 LFCSP封裝。ADA4939-1千片訂量報(bào)價(jià)為3.79美元/片，ADA4939-2千片訂量報(bào)價(jià)為5.69美元/片。欲了解更多信息，請(qǐng)?jiān)L問(wèn)www.analog.com/pr/ADA4939.