Summary of Analog Devices’ 120-Milliwatt ADC Driver Features Industry’s Best Distortion Performance and Lowest Power Consumption at 70 MHz : New differential amplifier drives 14- and 16-bit ADCs in communications and high-speed instrumentation applications
The ADA4939 is a versatile amplifier designed for differential and single-ended signal configurations, with an internal common-mode feedback system to optimize output balance and reduce distortion. It is ideal for communication applications like cellular base stations, supporting frequencies up to 100 MHz and high-accuracy ADCs (14- and 16-bit). The dual-channel ADA4939-2 variant offers low cross-talk and precise gain and phase matching for I/Q demodulation. Manufactured using a proprietary silicon-germanium process, it provides low noise, wide bandwidth, and high slew rate.
Parts used in the ADA4939 Amplifier Project:
- ADA4939 Amplifier
- ADA4939-2 Dual-Channel Amplifier
- Silicon-Germanium (SiGe) Complementary Bipolar Process Components (fabrication technology)
NORWOOD, Mass. (PRWEB) June 11, 2008
The ADA4939 can be used in either differential-to-differential or single-ended-to-differential configurations. An internal common-mode feedback loop allows the user to independently adjust the ADA4939 output common-mode level to match the input common mode voltage of the ADC, and at the same time achieve exceptional output balance and suppression of even-order harmonics.
The ADA4939 is especially well suited to communications applications, such as cellular base stations using low IF (intermediate frequency) and baseband signal processing at frequencies up to 100 MHz, and where 14- and 16-bit accuracy is required. The two-channel version, the ADA4939-2, is ideal for driving dual ADCs used in I/Q demodulation schemes. It offers low cross-talk of 80 dB at 100 MHz while providing gain and phase matching.
The ADA4939 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/
