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??? ADA4939差分放大器專為驅動當今的14 bit 和16 bit 轉換器而優(yōu)化，在3.3 V單電源下的功耗低于120 mW，在70 MHz頻率下的無雜散動態(tài)范圍(SFDR)達到82 dB。新款差分放大器提供單通道和雙通道版本，能驅動高達16 bit分辨率的ADC，如ADI公司的AD9460與AD9461，也可以驅動低功耗14 bit ADC，如AD9246。

??? ADA4939可以使用差分-差分配置或單端-差分配置。內部共模反饋環(huán)路允許用戶獨立調整輸出共模電平，以與 ADC的輸入共模電壓匹配，同時實現(xiàn)良好的輸出平衡和偶次諧波抑制。

??? ADA4939特別適合通信應用，例如，在高達100 MHz頻率使用低中頻（IF）與基帶信號處理的手機基站中，要求14 bit 和16 bit 的精度，雙通道ADA4939-2非常適合驅動正交解調器方案中使用的雙ADC，在100 MHz提供-80 dB的低串擾" title="串擾">串擾，同時保證增益和相位匹配。

??? ADA4939采用ADI公司專有的硅鍺(SiGe)互補雙極工藝制造，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℃。

供貨與報價

??? 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。ADA4939-1千片訂量報價為3.79美元/片，ADA4939-2千片訂量報價為5.69美元/片。欲了解更多信息，請訪問www.analog.com/pr/ADA4939.