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Compact DACs power up versatile functionality

Posted: 22 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:DAC? RFID systems? converter?

Linear Technology Corp. introduced the LTC2631, a family of pin- and software-compatible 12bit, 10bit and 8bit DACs in a tiny TSOT-23 package, making it the smallest I?C DAC family with an internal reference on the market today. DACs in such small packages are ideal for fine tuning bias voltages in applications such as optical networking and RFID systems. The LTC2631 makes the integrated 10ppm/C reference output available to drive the reference inputs for all other data converters on the board, while maintaining good stability over temperature.

The LTC2631 releases alongside an SPI-equivalent LTC2640 12-/10-/8-bit family, each offering the choice of a 2.5V or 4.096V full-scale output range. Alternatively, an external reference can be applied if more accuracy or a non-standard voltage range is required. The LTC2631/LTC2640 DAC outputs can power up to zero-scale or midscale with the internal or external reference, allowing more flexibility for designs that cannot be forced to ground when power is first applied.

The DACs both offer excellent 12bit DC performance of 1LSB (max) integral nonlinearity error, enabling operation in open-loop as well as closed-loop systems. The LTC2631 and LTC2640 complement a family of ultratiny DACs that includes the previously released LTC2630 (SPI-compatible, SC70 6-pin package, internal reference not bonded out). These low-power DACs draw only 180uA of supply current at 3V, making them ideal for portable equipment.

The LTC2631/LTC2640 are ideal for automotive voltage adjustment, as they have guaranteed specifications for the H-grade temperature range (-40C to +125C), in addition to the industrial (-40C to +85C) and commercial (0C to +70C) temperature ranges. The LTC2631 and LTC2640 12bit, 10bit and 8bit options are now available in 8-pin TSOT23 packages.

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