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12-bit ADC consumes less power

Posted: 22 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:analog devices? adi? analog-to-digital converter? adc? converter?

Analog Devices Inc. released a 12-bit monolithic analog-to-digital converter (ADC) that is said to consume 40 percent less power than comparable devices.

The new product consumes 190mW of power at 65Ms/s, 135mW at 40Ms/s and 90mW at 20Ms/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 ADC operates from a single 3V power supply and features a separate digital output driver supply to accommodate 2.5V and 3V logic families.

The ADC 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-/65MS/s ADCs, and also with the 12-bit AD9236 and 14-bit AD9245 80MS/s ADCs. 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.

Rated for operation between the -40C to 85C temperature range, the AD9237 devices are available in a 5-by-5mm 32-pin LFCSP. Pricing ranges between $7.75 and $12.40 per unit in 1,000-piece quantities. A data sheet on the AD9237 can be found online.

- Bettyann Liotta


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