Mixed Signal/Analog

Quad 12-Bit/10-Bit/8-Bit Rail-to-Rail I2C DACs with Internal Reference Include Reset to High Impedance Outputs for Power Supply Margining

9th December 2009
ES Admin
Linear Technology has announced the LTC2635 quad 12-bit, 10-bit and 8-bit rail-to-rail digital-to-analog converters (DACs), which integrate a precision 10ppm/ºC reference in tiny 3mm x 3mm QFN and MSOP packages. Ordering options include 2.5V (LTC2635-L) and 4.096V (LTC2635-H) DAC full-scale outputs. In addition to offering power-on reset to zero and mid-scale options, the LTC2635-L also includes ordering options for high impedance outputs at power-on reset and during shutdown. This allows the DAC to be used in applications such as power supply margining where the DAC outputs must be electrically isolated from the power supply at power-on, before being called to action to adjust supply voltages up and down.
The LTC2635's small size and internal reference are important for a variety of industrial, automotive and ATE applications. The LTC2635 offers 12-bit performance of ±2.5LSB (max) INL error and 3nV•s crosstalk, ensuring that a voltage change on one DAC has minimal effect on the other DACs. Operating from a single 2.7V to 5.5V supply, supply current is a low 125µA per DAC.

In addition to selecting one of three resolution options, designers can also choose between a 2.5V or 4.096V full-scale range, as well as power-up options for zero-scale, mid-scale or Hi-Z. The 16-pin 3mm x 3mm QFN package includes a hardware load-DAC (LDAC) pin, three address pins for selecting 27 unique I2C addresses, and a REFLO pin. The 10-pin MSOP package has just one address pin for selection of up to 3 unique addresses on the I2C bus. All LTC2635 options are guaranteed over the automotive (-40ºC to +125ºC) and commercial (0ºC to +70ºC) temperature ranges.

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