Electronic Design

CB Process Yields Power-Efficient High-Speed Op Amps

Leveraging its VIP10 sixth-generation dielectrically isolated complementary bipolar (CB) process, National Semiconductor has launched a new line of power-efficient high-speed op-amp ICs. Designed for xDSL, set-top boxes, cable modems, and other communications applications, the LMH-66xx series delivers a good bandwidth-to-power ratio, high output-drive current, and low power consumption.

Each member addresses a specific market. The LMH6672 dual high-speed amplifier suits xDSL line drivers. The LMH6654 and -55 are crafted for xDSL receivers. Likewise, the LMH6642 and -43 are tweaked for products like cable set-top boxes and image scanners. The LMH6645, -46, and -47 are designed for use in GPS receivers, DVD players, and portable information appliances.

Offering a bandwidth-to-power ratio of 150 MHz/5.5 mA and a very low distortion rate of −84 dBc, the LMH6672 provides an output current of ±320 mA and a slew rate of 150 V/µs. The LMH6654 and -55 achieve a ratio of 240 MHz/4.5 mA with an output drive of 110 mA and a noise performance of 4.5 nV/√Hz. Their slew rate is 200 V/µs.

Similarly, the LMH6642 and -43 offer a bandwidth of 130 MHz with an output current of ±90 mA using only 2.4 mA of supply current from a single 3- to 10-V supply. The high-speed LMH6645, -46, and -47 draw only 650 µA of supply current to deliver a −3-dB bandwidth of 80 MHz and a slew rate of 24 V/µs. Also, the LMH6647 features zero power in the shutdown mode.

Of the eight devices, five are in production now. The LMH6645, -46, and -47 are slated for release in the third quarter. In quantities of 1000, prices start at $0.79 each. National's second wave of LMH series ICs, targeting optical storage and video applications, will be unwrapped in the fourth quarter.

National Semiconductor Corp., 2900 Semiconductor Dr., P.O. Box 58090, Santa Clara, CA 95052-8090; (408) 721-5000; www.national.com.

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