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| ADI ADA4939高性能ADC驱动方案 | |||||
作者：ADI 文章来源：ADI 点击数： 更新时间：2008-6-16  |
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The ADA4939 is a low noise, ultralow distortion, high speed differential amplifier. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 100 MHz. The output common-mode voltage is user adjustable by means of an internal common-mode feedback loop, allowing the ADA4939 output to match the input of the ADC. The internal feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products. With the ADA4939, differential gain configurations are easily realized with a simple external feedback network of four resistors that determine the closed-loop gain of the amplifier. The ADA4939 is fabricated using Analog Devices, Inc., proprietary silicon-germanium (SiGe), complementary bipolar process, enabling it to achieve very low levels of distortion with an input voltage noise of only 2.3 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4939 make it well suited for a wide variety of data acquisition and signal processing applications. ADA4939主要特性: Extremely low harmonic distortion 102 dBc HD2 10 MHz 83 dBc HD2 70 MHz 77 dBc HD2 100 MHz 101 dBc HD3 10 MHz 97 dBc HD3 70 MHz 91 dBc HD3 100 MHz Low input voltage noise: 2.3 nV/√Hz High speed 3 dB bandwidth of 1.4 GHz, G = 2 Slew rate: 6800 V/μs, 25% to 75% Fast overdrive recovery of <1 ns ±0.5 mV typical offset voltage Externally adjustable gain Stable for differential gains ≥2 Differential-to-differential or single-ended-to-differential operation Adjustable output common-mode voltage Single-supply operation: 3.3 V to 5 V ADA4939应用: ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers  图1.ADA4939功能方框图  图2.ADA4939失真测量电路图  图3. G=2时ADA4939单端到差分系统电路图  图4.输入和输出采用AC耦合的驱动AD9445 ADC电路图 详情请见: http://www.analog.com/UploadedFiles/Data_Sheets/ADA4939-1_4939-2.pdf |
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