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Low-power ADCs target portable industrial, medical apps

Dallas, Tex. — Texas Instruments Inc. (TI) has introduced a pair of 16-bit analog-to-digital converters (ADCs) that it claims to offer 2x better linearity (±1.5 LSB maximum INL) than competing devices. The low-power ADS8317 and ADS8326 ADCs are said to provide an easy performance upgrade for portable, battery-powered applications including industrial data acquisition and portable medical instrumentation. They are available in industry-standard MSOP-8 or 3 x 3-mm SON-8 packages.

When operating at the full data rate of 250 kSPS, the ADCs require very little power (10 mW at 5V). At 200 kSPS, power dissipation is less than 4 mW at 2.7 V. When operating at lower data rates, the high-speed operation enables the devices to spend most of the time in a power-down mode. For example, the average power dissipation is less than 0. 2 mW at a 10 kSPS data rate (2.7 V), said TI.

Both devices offer “best-in-class” temperature drift specifications for reliable measurements across the operating temperature range. The ADS8317 (true differential input) features 0.1 ppm/C gain error drift and 0.2 ppm/C offset error drift. The ADS8326 (single-ended input) delivers 0.3 ppm/C gain error drift and 0.2 ppm/C offset error drift.

The ADS8317 and ADS8326 are based on a successive approximation (SAR) capacitive charge redistribution architecture that inherently includes a sample/hold function. Each offers a high-speed, wide-voltage SPI/SSI serial interface that can be used in a multi-device, daisy-chain configuration. Both devices operate over a wide supply voltage range of 2.7 V to 5.5 V.

Pricing: Starts at $5.00 in 1,000-piece quantities (suggested resale pricing) for both devices.
Availability: The ADS8317 and ADS8326 are available now in a MSOP-8 package. The 3 x 3-mm SON-8 package will be available in first quarter 2008. Evaluation modules (EVMs) are also available.
Product information: ADS8317, ADS8326 and Amplifier and Data Converter Selection Guide

Texas Instruments Inc. , 1-800-477-8924, www.ti.com

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