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Low-power receiver ICs advance ultrasound system design

November 08, 2010 | Paul Buckley | 222901743
Low-power receiver ICs advance ultrasound system design Analog Devices, Inc., has launched the fourth generation of its octal (eight-channel) ultrasound receivers with the introduction of two new ICs that reduce system size, complexity, and power consumption for high-end, mid-range, and portable ultrasound systems. The need for smaller, faster, lower-power ultrasound equipment continues to grow as hospitals, medical clinics, and medical emergency units increasingly rely on more sophisticated ultrasound equipment for providing diagnostic imaging.
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The new AD9278 and AD9279 receiver chips each integrate ADI's data conversion technology for low noise TGC (time-gain-control) mode performance while providing high dynamic range I/Q demodulators that reduce the power and area for implementation of CW (continuous wave) Doppler processing.

The new octal ultrasound receivers provide the highest available output-referred large-signal SNR - up to 67 dB - enabling improved sensitivity in diagnostic ultrasound systems while reducing board space up to 40 percent.

The AD9278 octal ultrasound receiver is designed for portable ultrasound systems while the AD9279 octal ultrasound receiver is suitable for high-end and mid-range systems. The devices are pin- and package-compatible with each other and allow designers to use a common PCB layout that can be leveraged across multiple ultrasound platforms to save development time and cost.

Products in Analog Devices' octal ultrasound receiver portfolio include the AD9271, which, when unveiled in April 2007, was the first device to integrate a complete octal ultrasound receiver on a single chip, and is used today in ultrasound equipment throughout the world. Other octal ultrasound receivers include the AD9272 for high-and mid-range cart-based ultrasound equipment, AD9273 for portable ultrasound systems, and the AD9276 and AD9277 that enable high-quality CW Doppler processing.

The new AD9278 and AD9279 octal ultrasound receivers feature a variable gain range of 45 dB, a fully differential signal path, an active input preamplifier termination, a maximum gain of up to 52 dB, and an ADC (analog-to-digital converter) with a conversion rate of up to 80 MSPS.

Each device is optimised for dynamic performance and low-power operation in applications where a small package size is critical.

In CW mode, the AD9278 features ultra-low power consumption of 25 mW per channel, while the AD9279 offers low power consumption of 50 mW per channel.

In TGC mode, the AD9278 consumes only 88 mW per channel at 40 MSPS, and the AD9279 consumes only 139 mW per channel at 40 MSPS. For high-end systems, the AD9279 offers a highly configurable LNA featuring low input-referred noise density of 0.67 nV/Hz.

Availability and Pricing

AD9278 is available now and packaged in a 10-mm 10-mm BGA and is priced at $58 each in 1,000 pieces.

AD9279 is available now and packaged in a 10-mm 10-mm BGA and is priced at $62 each in 1,000 pieces.

AD9279 and AD9279-65EBZ are available now and are priced at $250 per unit in single unit quantities.

More information about the AD9278 octal ultrasound receivers at
www.analog.com/en/digital-to-analog-converters/da-converters/AD9278/products/product.html

More information about the AD9279 octal ultrasound receivers at
www.analog.com/en/digital-to-analog-converters/da-converters/AD9279/products/product.html

Visit Analog Devices at www.analog.com

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