High-speed op amp claims lowest noise performance with 900-MHz bandwidth at a gain of 10
May 18, 2010 // Paul Buckley
A new ultra-high-speed operational amplifier (op amp) from National Semiconductor Corp., claims to deliver the industry's lowest noise (0.69 nV/sqrt Hz) with -3 dB bandwidth of 900 MHz at a gain of 10.
The PowerWise LMH6629 provides designers a mix of wide bandwidth, high gain and precision amplification for systems where minimal noise addition is a key performance requirement. These include 16-bit systems for communications, test and measurement, medical imaging, industrial, and light detecting and ranging (LIDAR) applications.
The LMH6629 also provides low input current noise (2.6 pA/sqrt Hz) and second and third harmonic distortion (f = 1 MHz) performance of -90 dBc and -94 dBc, respectively. The op amp's low input noise, low distortion and high speed combined with ultra-low DC errors - 780 uV input offset voltage max at 25 degrees C and ±0.45 µV per degree C of TCVos - enable precision operation in both AC- and DC-coupled applications.
The LMH6629's input common-mode range extends below ground and the output swings to within 0.8 V of either rail with a linear output current of greater than ±250 mA. The PowerWise op amp consumes 15.5 mA and features a supply voltage range from 2.7 V to 5.5 V. Its user selectable internal compensation eliminates the external compensation components and additional design time required with other amplifiers. With the LMH6629, designers can set a minimum gain of 4 or 10 by pulling the minimum gain select pin low or high.
The LMH6629 is manufactured on National's new CBiCMOS8 silicon-germanium (SiGe) complementary bipolar-CMOS process technology. Among the most advanced analog processes in the industry, CBiCMOS8 features a monolithic combination of SiGe NPN and PNP transistors, as well as low-power CMOS transistors that enable high speed, linearity, circuit density, low power and low noise for demanding high-speed analog applications.
Availability and Pricing
Available now, the LMH6629 is supplied in an 8-pin LLP package and operates over the extended industrial temperature range of -40 to 125 degrees C. The LMH6629 is priced at 1.88 US Dollars each in 1,000-unit quantities.
Related link: LMH6629
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