Texas Instrument's has extended its range of high accuracy digital-to-analog converters (DAC) with an 18bit monotonic DAC that targets what is considered by industry analyst Databeans as the largest segment of the data converter market, industrial applications.
Boasting +/-2 LSB integral nonlinearity (INL) and +/-1 LSB differential nonlinearity (DNL), the DAC9881 has been designed with precision applications in mind, such as automatic test equipment, instrumentation, process control, data acquisition and communications systems.
This DAC owes its accuracy to TI''s HPA07 high-performance analog CMOS process technology, on which both it and the INA333 zero-drift amplifier launched earlier this year, was developed. “This is why we see such a bright future for analog ” this is the kind of accuracy that will never be integrated into any controller or dsp,” said Christoph Gromann, commenting on the specialty process technology employed by TI at the product's launch.
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. The device supports a SPI serial interface capable of operating with input data clock frequencies up to 50 MHz, enabling it to interface with the most popular DSPs, MCUs and FPGAs. With low power consumption (4mW at 5V) and small packaging (QFN-24), this part enables higher density board layouts. It is also pin-compatible with the 16bit DAC8881, thus offering a potential downgrade/upgrade path.
Other key features include 24 nV/rtHz noise, 5-us settling time, rail-to-rail output swing over the full supply range of 2.7 V to 5.5 V, plus selectable power-on reset to zero-scale or midscale. A high voltage extension up to 40V will be made available.