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18bit DAC transforms system performance, designs

Posted: 17 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:DAC 18bit? converter digital analog?

Texas Instruments Inc. introduces what the company touts as the industry's highest accuracy digital-to-analog converter (DAC), which features 18bit monotonic performance, 2 LSB integral nonlinearity (INL) and 1 LSB differential nonlinearity. Delivered in a small QFN-24 package, the DAC9881 enables customers to increase system performance and simplify designs in precision industrial applications such as automatic test equipment, instrumentation, process control, data acquisition and communications systems, says TI.

Developed on TI's HPA07 high-performance analog CMOS process technology, the DAC9881 enables customers to achieve higher levels of system performance in industrial applications, such as the following:

? 18bit monotonic performance guarantees stability in closed-loop applications, such as industrial process control;
? Low linearity error, low noise and 4x more granularity than 16bit DACs increase accuracy of open-loop applications, such as automatic test equipment; and
? 18bit DAC with integrated low-noise output buffer reduces external components required to achieve 18bit performance by 75 percent.

The DAC9881 is a single-channel, voltage-output DAC with an on-chip, low-noise output buffer, which reduces the number of external components required, claims TI. The device supports a SPI serial interface capable of operating with input data clock frequencies up to 50MHz for a fast and flexible interface to the most popular DSPs, MCUs and FPGAs. The DAC combines low power consumption (4mW at 5V) and small packaging (QFN-24) to allow higher density board layouts.

Other features include 24nV/rtHz noise, 5?s settling time, rail-to-rail output swing over the full supply range of 2.7V to 5.5V and selectable power-on reset to zero-scale or midscale.

The DAC9881 is available now from TI and its authorized distributors in a QFN-24 package (4mm x 4mm). Suggested resale pricing starts at $16.90 each in 1,000-piece quantities.

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