Differential amplifier from ADI drives high-speed ADCs
Analog Devices has introduced a high-speed differential amplifier that delivers the industry’s best combination of high performance, low noise and reduced power consumption for engineers driving high-gain ADCs (analogue-to-digital converters) in power-sensitive communications and instrumentation systems. Drawing less than half the current of other devices in its class, ADI’s ADA4927 differential amplifier achieves greater than 80 dB SFDR (spurious-free dynamic range) at G=10 (gain=10), more than 6 dB better than competing ADC drivers. Even at such high gain, the current feedback architecture of the ADA4927 allows it to maintain performance over an input bandwidth range of dc to more than 100 MHz, while the performance of other ADC drivers quickly degrades at frequencies beyond 70 MHz.The
The internal common-mode feedback loop of the ADA4927 allows the user to independently adjust the output common-mode level to match the input common-mode voltage of the ADC, while achieving exceptional output balance and suppression of even-order harmonics.
The ADA4927 is fabricated using ADI’s proprietary silicon-germanium (SiGe) complementary bipolar process, enabling it to achieve very low levels of distortion with an input voltage noise of 2.3 nV/rt Hz, as well as –3 dB bandwidth of 1.4 GHz (G=+2) and a slew rate of 5000 V/µS. Consuming less than 120 mW from a single 3.3-V supply, the ADA4939 is specified to operate over the −40 degrees C to +105 degrees C temperature range for both 3.3-V and 5-V operation.
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