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title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器" title="差分放大器">差分放大器产品系列，在驱动通信基础设施、仪器仪表以及其它高速设备中的高分辨率模数转换器（ADC）时，它能提供所需的最大性能。

    ADA4939差分放大器专为驱动当今的14 bit 和16 bit 转换器而优化，在3.3 V单电源下的功耗低于120 mW，在70 MHz频率下的无杂散动态范围(SFDR)达到82 dB。新款差分放大器提供单通道和双通道版本，能驱动高达16 bit分辨率的ADC，如ADI公司的AD9460与AD9461，也可以驱动低功耗14 bit ADC，如AD9246。

    ADA4939可以使用差分-差分配置或单端-差分配置。内部共模反馈环路允许用户独立调整输出共模电平，以与 ADC的输入共模电压匹配，同时实现良好的输出平衡和偶次谐波抑制。

    ADA4939特别适合通信应用，例如，在高达100 MHz频率使用低中频（IF）与基带信号处理的手机基站中，要求14 bit 和16 bit 的精度，双通道ADA4939-2非常适合驱动正交解调器方案中使用的双ADC，在100 MHz提供-80 dB的低串扰" title="串扰">串扰，同时保证增益和相位匹配。

    ADA4939采用ADI公司专有的硅锗(SiGe)互补双极工艺制造，具有极低的失真度，输入电压噪声为2.3 nV/rt Hz，-3 dB带宽为1.4 GHz (G=+2)，压摆率为5000 V/μS。采用3.3 V~5 V电源电压，工作温度范围为-40℃～+105℃。

供货与报价

    ADA4939-1与ADA4939-2现已批量供货。ADA4939-1采用3 mm × 3 mm 16引脚LFCSP无铅 封装，双通道ADA4939-2采用4 mm × 4 mm 24引脚 LFCSP封装。ADA4939-1千片订量报价为3.79美元/片，ADA4939-2千片订量报价为5.69美元/片。欲了解更多信息，请访问www.analog.com/pr/ADA4939.