Features

• Tiny 3mm × 3mm 8-Pin DFN Package
• Maximum 16-Bit INL Error: ±1LSB over Temperature
• Low 120µA Supply Current
• Guaranteed Monotonic over Temperature
• Low 0.5nV•sec Glitch Impulse
• 2.7V to 5.5V Single Supply Operation
• Fast 1µs Settling Time to 16 Bits
• Unbuffered Voltage Output Directly Drives 60k Loads
• 50MHz SPI™/QSPI™/MICROWIRE™ Compatible Serial Interface
• Power-On Reset Clears DAC Output to Zero Scale(LTC2641) or Midscale (LTC2642)
• Schmitt-Trigger Inputs for Direct Optocoupler Interface
• Asynchronous CLR Pin
• 8-Lead MSOP, 3mm × 3mm DFN, and 8-Lead SO
  Packages (LTC2641)
• 10-Lead MSOP and 3mm × 3mm DFN Packages(LTC2642)

Typical Application

Description

The LTC2641/LTC2642 are families of 16-, 14- and 12-bit unbuffered voltage output DACs. These DACs operate from a single 2.7V to 5.5V supply and are guaranteed monotonic over temperature. The LTC2641A-16/LTC2642A-16 provide 16-bit performance (±1LSB INL and ±1LSB DNL) over temperature. Unbuffered DAC outputs result in low supply current of 120µA and a low offset error of ±1LSB.

Both the LTC2641 and LTC2642 feature a reference input range of 2V to V_DD. V_OUT swings from 0V to V_REF. For bipolar operation, the LTC2642 includes matched scaling resistors for use with an external precision op amp (such as the LT1678), generating a ±V_REF output swing at R_FB.

The LTC2641/LTC2642 use a simple SPI/MICROWIRE compatible 3-wire serial interface which can be operated at clock rates up to 50MHz and can interface directly with optocouplers for applications requiring isolation. A power-on reset circuit clears the LTC2641’s DAC output to zero scale and the LTC2642’s DAC output to midscale when power is initially applied. A logic low on the CLR pin asynchronously clears the DAC to zero scale (LTC2641) or midscale (LTC2642). These DACs are all specified over the commercial and industrial ranges.