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DACs with internal reference allow 50% board space reduction

Posted: 08 Jun 2007     Print Version  Bookmark and Share

Keywords:small DACs  internal reference  SPI 

LTC2630 DACs from Linear Tech

Linear Technology Corp. has introduced the a family of 12-, 10- and 8bit DACs that achieve 12bit DC performance of ±1LSB(max) integral non-linearity error. Available in tiny 2.1-by-2mm SC70 packages, these single voltage output DACs are the 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 per cent board space reduction over competing DACs with an internal reference.

LTC2630 is suitable for "under the hood" automotive voltage adjustment, as it is guaranteed for operation over the H-grade temperature range (-40°C to 125°C), in addition to the I grade (-40°C to 85°C) and C-grade (0°C to 70°C) 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 160µA of supply current at 3V and 180µA 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 5µs. 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 optimisation. Pricing begins at Rs.58.44 ($1.43) each for the LTC2630-12, Rs.50.67 ($1.24) each for the LTC2630-10 and Rs.40.05 ($0.98) each for the LTC2630-8 in 1,000-piece quantities.

- Henri Arnold
EE Times Europe

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