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Small DACs feature selectable internal reference

Posted: 08 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:small DACs? internal reference? SPI?

LTC2630 DACs from Linear Tech

Linear Technology Corp. introduces the LTC2630, a family of 12-, 10- and 8bit DACs in tiny 2.1-by-2mm SC70 packagesthe smallest available DACs with an internal reference.

LTC2630 offers the choice of an internal 2.5V or 4.096V 10ppm/C full-scale reference, providing nearly a 50 percent board space reduction over competing DACs with an internal reference. These single voltage output DACs achieve 12bit DC performance of 1LSB(max) integral nonlinearity error.

LTC2630 is suitable for "under the hood" automotive voltage adjustment, as it is guaranteed for operation over the H-grade temperature range (-40C to 125C), in addition to the I grade (-40C to 85C) and C-grade (0C to 70C) temperature ranges. With its tiny SC70 package, internal reference and resolution options, the LTC2630 family can be used in a wide range of portable and space-constrained applications including battery-powered, consumer and process control equipment.

The low-power LTC2630 draws only 160?A of supply current at 3V and 180?A at 5V. Communicating via a three-wire SPI-compatible serial interface at clock rates up to 50MHz, the LTC2630 DAC output settles for a half-scale step in less than 5?s. Operating from a single 2.7-5.5V supply, the output can swing to the internal reference voltage or rail-to-rail to the supply voltage. DAC outputs can power up to zero-scale or mid-scale, allowing more flexibility for designs that cannot be forced to ground when power is first applied.

LTC2630-12, LTC2630-10 and LTC2630-8 are pin-compatible 12-, 10- and 8-bit DACs, respectively. They are all available today in 6-pin SC70 packages, offering a pin- and software-compatible family for performance/cost optimization. Pricing begins at $1.43 each for the LTC2630-12, $1.24 each for the LTC2630-10 and $0.98 each for the LTC2630-8 in 1,000-piece quantities.

- Henri Arnold
EE Times-Europe

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