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8-channel ultrasound receivers enhance CW doppler processing

Norwood, Mass.—Analog Devices Inc. has introduced the third generation of its octal (eight-channel) ultrasound receivers. Designed for CW (continuous wave) as well as PW (pulse wave) Doppler ultrasound, the AD9276 and AD9277 octal ultrasound receivers integrate gain, filtering, data conversion, and demodulation for CW Doppler signal processing on a single chip.

ADI's octal ultrasound receivers allow system designers to provide CW Doppler capabilities while reducing system size, complexity, and power consumption for mid- and high-end cart-based ultrasound systems. The AD9276 and AD9277 octal ultrasound receivers consume 90 mW per channel when processing signals in CW Doppler mode and require 80 percent less board space than competing ultrasound receiver subsystems, according to ADI.

The AD9276 octal ultrasound receiver combines an eight-channel VGA (variable-gain amplifier) with a LNA (low-noise preamplifier), anti-aliasing filters, and a 12-bit 80-MSPS (million samples per second) ADC (analog-to-digital converter). The AD9277 octal ultrasound receiver features the same level of integration but incorporates a 14-bit 50-MSPS ADC.

According to ADI, these two octal receivers provide the industry's lowest input-referred noise (0.75 nV/rt-Hz @ 5 MHz typical) when operating under real-world conditions, and 6 dB/rt-Hz better input dynamic range than competing devices. The AD9276 dissipates 190 mW per channel at 12 bits and 40 MSPS, while the AD9277 dissipates 190mW per channel at 14 bits and 40 MSPS.

Pricing: In a 100-lead TQFP and in 1,000-piece quantities, the AD9276 is $62, and the AD9277 is $68.
Availability: Sampling now, with volume production scheduled for June 2009.

Datasheets: AD9276 and AD9277.

Analog Devices, www.analog.com

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