Industry’s Fastest SAR Analog-to-Digital Converter

TUCSON, Ariz. (October 9, 2003) Texas Instruments (TI) Incorporated unveiled the first successive approximation (SAR) analog-to-digital converter (ADC) at any resolution to achieve four mega samples per second (MSPS). “The ADS7881 gives customers an unparalleled solution by combining 12-bit no missing codes at 4MHZ sampling rate, 1LSB linearity, 1.5mV offset, -91dB harmonic distortion, 71.5dB signal-to-noise and only 95mW power dissipation,” said Tony Chang, strategic marketing engineer for TI's data acquisition products.. This is the only device available that can address high speed data acquisition needs by providing specification with an input signal frequency as high as 1.8MHz.” SAR-based architecture, in contrast to high-speed pipeline and delta-sigma architectures, has the advantage of no latency conversion, which is ideal for multiplexed or servo-control applications. Additionally, the DC performance of these devices, especially offset and offset drift, is far superior to other high-speed ADCs currently available. The ADS7881 offers designers a complete solution by integrating an internal reference and reference buffer. The device has a pseudo-differential, unipolar input range (0V to 2.5V) common to many high speed ADCs. It offers a 12-bit interface with an additional byte mode that provides easy interface with 8-bit processors. A nap mode reduces power dissipation to 10mW and a power down mode consumes only 10uW. All members of TI's high-speed 12-bit, 16-bit and 18-bit SAR ADC family are offered in pin-compatible packages, providing designers with comprehensive upgrade options from 1.25MSPS to 4MSPS and from 12-bit to 18-bit resolution. The ADS7881 is optimized to work with TI's high-performance amplifiers (THS4031 and THS4211). The ADS7881 comes in a 48-lead TQFP package, and is available now from TI and its authorized distributors. The device is priced at $7.00 in 1,000 piece quantities (suggested resale pricing). Evaluation modules (EVMs) are also available Texas Instruments Incorporated Semiconductor Group, SC-03220 Literature Response Center P.O. Box 954 Santa Clara, CA 91380 1-800-477-8924 ADS7881 data sheet

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