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TI 18-bit SAR ADC performs 500kSa/s

Posted: 12 Jul 2002 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ads8381? sar adc? successive approximation register adc? analog signal converter?

Texas Instruments Inc. has released the ADS8381, claimed by the company to be industry's first monolithic 18-bit, 500kSa/s successive approximation register (SAR) ADC.

The device is suitable for use in high-end instrumentation and medical equipment, chromatography, advanced IC test equipment, optical power monitoring, and wide dynamic range data acquisition systems.

"Historically, SAR and Delta-Sigma converters have provided the necessary dynamic range and linearity for data acquisition and medical equipment. Higher speed may be achieved by a hybrid solution. However, emerging high-end applications can not afford the latency, limited resolution or the price tag associated with these devices," said Tony Chang, strategic marketing engineer for TI's data acquisition products.

"In response to this market demand, TI has developed a new performance point for SAR converters. The ADS8381 will allow customers to develop advanced systems with breakthrough resolution, performance and price," he added.

The ADS8381's 18-bit no missing code performance is claimed by the company to improve image resolution, while the high dynamic range improves the overall efficiency of the data acquisition system. In addition, the converter has incorporated a high-performance on-chip reference buffer that reduces the need for external components, thereby reducing system complexity, circuitry area and total system cost.

The 48-pin TQFP device has a nonlinearity <19.5ppm over the first octal input range (12.5LSB at the 18-bit level). It consumes 100mW (500kHz sampling rate) and offers a full 18-bit interface, a 16-bit option where data is read using two read cycles, or an 8-bit bus using three read cycles.

The ADS8381 operates on a single 5V supply and is specified over the industrial temperature range of -400C to 850C.

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