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12-bit A/D converter consumes less power

Norwood, Mass. — Analog Devices, Inc. is touting a 12-bit monolithic analog-to-digital converter that is said to consume 40 percent less power than comparable devices.

The analog-to-digital converter (A/D converter) consumes 190 mW of power at 65 Msamples/s, 135 mW at 40 Msamples/s and 90 mW at 20 Msamples/s, allowing for a higher channel count and simplified signal path to portable 12-bit systems. Further power savings is available with a scaling feature, which lowers the power as the speed of the converter is reduced. The A/D converter operates from a single 3-V power supply and features a separate digital output driver supply to accommodate 2.5-V and 3-V logic families.

The A/D converter is suitable for multiplexed systems that switch full-scale voltage levels in successive channels and for sampling single-channel inputs at
frequencies well above the Nyquist rate. Applications include portable instrumentation, ultrasound, high-end imaging, digital still cameras, scanner and low-power communications applications.

The AD9237 is pin-to-pin compatible with the company's 10-bit AD9215, 12-bit AD9235 and 14-bit AD9245 20/40/65 Msamples/s A/D converters, and also with the 12-bit AD9236 and 14-bit AD9245 80 Msamples/s A/D converters. This enables designers to easily change resolutions and speeds, or upgrade performance in next-generation systems, according to ADI. In addition, a patented sample-and-hold amplifier (SHA) input allows for a variety of user-selectable input ranges and offsets including single-ended applications.


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The AD9237 devices, offered in a -40°C to +85°C temperature range, are available now in a 5mm x 5mm 32-pin LFCSP.

Pricing ranges between $7.75 and $12.40 per unit in 1,000-piece quantities. Click here for the AD9327 data sheet.

Analog Devices , 1-800-262-5643, www.Analog.com.

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