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AFE improves ultrasound images

Posted: 21 Sep 2005     Print Version  Bookmark and Share

Keywords:analog devices  adi  ad8334  variable gain amplifier  vga 

Analog Devices Inc. rolled out a quad variable gain amplifier (VGA) and two quad adcs save 85% board space" target=_blank>analog-to-digital converters (ADCs) 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 10bit and 12bit quad ADCs 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 101dB signal-to-noise ratio (SNR) at 5MHz, which is twice the SNR of the nearest competing VGA, according to Riedel.

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

The 10bit AD9219 and the 12bit AD9228 quad A/D converters are available in both 40MS/s and 65MS/s speed grades and achieve a 70dB 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, while the AD9219 and AD9228 quad ADCs are available in a 48-lead LFCSP. The AD9219 is priced at $15.98 for the 40MS/s speed grade and at $19.98 for the 65MS/s. The AD9228 is priced at $23.50 for the 40MS/s speed grade and at $32.50 for the 65MS/s version. All pricing is in 1,000-piece quantities.

- Bettyann Liotta


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