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12-Bit/10-Bit/8-Bit I2C and SPI DAC Families with Integrated Reference in Tiny TSOT-23 Packages

Linear Technology Corporation introduces the LTC2631, a family of pin- and software-compatible 12-bit, 10-bit and 8-bit DACs in a tiny TSOT-23 package, making it the smallest I2C 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 mid-scale with the internal or external reference, allowing more flexibility for designs that cannot be forced to ground when power is first applied.

The LTC2631 and LTC2640 DACs both offer excellent 12-bit DC performance of ±1LSB(max) integral nonlinearity error, enabling operation in open-loop as well as closed-loop systems.

The LTC2631/LTC2640 are ideal for automotive voltage adjustment, as they have guaranteed specifications for the H-grade temperature range (-40°C to +125°C), in addition to the industrial (-40°C to +85°C) and commercial (0°C to +70°C) temperature ranges. The LTC2631 and LTC2640 12-bit, 10-bit, and 8-bit options are now available in 8-pin TSOT23 packages. Pricing begins at $1.03 each, in 1,000-piece quantities.



Summary of Features: LTC2631/LTC2640
Integrated Precision Reference:
        •2.5V Full-Scale 10ppm/°C (LTC2631-L/LTC2640-L)
        •4.096V Full-Scale 10ppm/°C (LTC2631-H/LTC2640-H)
Maximum A-Grade 12-Bit INL Error: 1LSB
Pin- and Software-Compatible I2C DACs (LTC2631)
Pin- and Software-Compatible SPI DACs (LTC2640)
Low Noise (0.7mVp-p, 0.1Hz to 200kHz)
Guaranteed Monotonic over Temperature
Bidirectional Reference
2.7V to 5.5V Supply Range (LTC2630-L)
Low Power Operation: 180uA at 3V
Nine Selectable I2C Addresses (LTC2631-Z)
Power-on Reset to Zero or Midscale Options
Tiny 8-Lead Thin SOT-23 Packages




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