Analog front end improves ultrasound images

Norwood, Mass. — Analog Devices Inc. rolled out a quad variable gain amplifier (VGA) and two quad analog-to-digital converters (A/D converters) that are said to dramatically improve image quality in advanced medical ultrasound equipment.

The new components, while available separately, together provide a complete, optimized analog front end (AFE) that not only increases dynamic range and image resolution in ultrasound equipment, but reduces package size, per-channel power consumption and bill of materials costs, said Bill Riedel, ADI's product line manager, precision signal processing group.

The quad VGA and 10- and 12-bit quad A/D converters also feature serial, low-voltage differential signaling (LVDS) data outputs that simplify board layout and further enhance image quality by enabling more data conversion paths to be routed within a given printed circuit board area, Riedel said.

The AD8334 quad VGA achieves a 101-dB signal-to-noise ratio (SNR) at 5 MHz, which is twice the SNR of the nearest competing VGA, according to Riedel.

The AD8334 also features an input-noise voltage level of 0.74 nV/√ Hz, while overload protection shields the device from ultrasound near-field signals and a selectable output clamping feature allows the VGA to protect the A/D converters from signal saturation.

The 10-bit AD9219 and the 12-bit AD9228 quad A/D converters are available in both 40- and 65-Msamples/second speed grades and achieve a 70-dB SNR and 82-dB spurious free dynamic range (SFDR).

The AD8334 quad VGA sells for $14.49 per unit and is available in a 64-lead LFCSP. Click here for the AD8334 data sheet.

The AD9219 and AD9228 quad A/D converters are available in a 48-lead LFCSP. The AD9219 is priced at $15.98 for the 40-Msamples/s speed grade and at $19.98 for the 65-Msamples/s.Click here for the AD9219 data sheet.

See related chart

The AD9228 is priced at $23.50 for the 40-Msamples/s speed grade and at $32.50 for the 65-Msamples/s version. Click here for the AD9228 data sheet. All pricing is in 1,000-piece quantities.

Analog Devices , 1-800-262-5643,

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