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DACs tout low power

Posted: 14 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? digital-to-analog converter? dac? dac121s101?

National Semiconductor Corp. expanded its data conversion offering with three low-power, pin- and function-compatible 8-, 10- and 12-bit digital-to-analog converters (DACs).

Each of the three DACs provides rail-to-rail output swing and input clock rates of 30MHz over the entire supply range of 2.7V to 5.25V. The reference for each is derived from the power supply, resulting in the widest possible dynamic output range, said Andrew Jue, product marketing director for National's Data Conversion Division. A power-down feature reduces power consumption to less than 0.2?W, which is especially important for portable, battery-powered applications, he said.

Aimed at portable industrial instruments, the DAC121S101 can be used to trim offset or gain, or generate high-performance analog output signals for control or display.

Combined with National's ADCs, amplifiers and other analog products, customers can build a complete signal-path solution around the microprocessor, field programmable gate array or digital signal processor that meets specific performance and power requirements, Jue said.

The single-channel DACs, with a settling time of 10?s, are designed to optimize performance and minimize power, Jue said. For example, the 12bit DAC provides typical performance of 0.25, -0.15 LSB differential non-linearity (DNL), 2.6LSB integral non-linearity (INL) and power consumption of 0.64mW at 3.6V.

The 10-bit DAC provides typical performance of +.15, -0.05LSB DNL, 0.6LSB INL and power consumption of 0.64mW at 3.6V (30MHz clock rate). The 8-bit DAC provides typical performance of 0.04, -0.02LSB DNL, 0.16, -0.12 LSB INL and power consumption of .64mW at 3.6V (30MHz clock rate).

Available in either a TSOT-6, or MSOP-8 package, pricing starts at $1.35 for the DAC121S101.

- Bettyann Liotta


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