LTC2641CMS8-12#PBF

Overview

The Analog Devices LTC2641CMS8-12#PBF is a 12-bit unbuffered voltage output digital-to-analog converter (DAC) housed in an 8-lead MSOP package. It operates on a single supply voltage ranging from 2.7V to 5.5V and consumes a typical supply current of 120µA. The device features a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) and differential nonlinearity (DNL) of ±0.5 LSB, a settling time of 1µs to 0.5LSB, and a glitch impulse of 0.5nV·sec. The DAC output swings from 0V to the external reference voltage.

Feature Summary

• 12-bit resolution with guaranteed monotonic operation over temperature
• Low power consumption of 120µA typical supply current
• Fast 1µs settling time to within 0.5LSB of full scale
• Unbuffered voltage output capable of driving loads greater than 60kΩ

Applications

• Process control and industrial automation systems
• Automatic test equipment
• Data acquisition systems

Procurement Notes

Verify the specific ordering suffix CMS8 corresponds to the 8-lead MSOP package and the -12 designation for 12-bit resolution. Confirm the commercial temperature grade (0°C to 70°C) matches the design requirements. Ensure the external reference voltage applied to the REF pin remains between 2V and VDD to maintain proper operation.

Selection Notes

Select this component when low power and high accuracy are required in a small footprint. The unbuffered output architecture minimizes offset error but requires careful consideration of load impedance; loads must exceed 60kΩ to prevent degradation of linearity performance. For bipolar output applications, the LTC2642 variant with internal scaling resistors should be considered instead.

Part Context

This part belongs to the LTC2641/LTC2642 family of 16-, 14-, and 12-bit voltage output DACs. The LTC2641 series provides unipolar output, while the LTC2642 series supports bipolar configurations via matched internal resistors. The CMS8 suffix indicates the MSOP package option, distinct from the DFN package variants available in the same family.

Replacement Considerations

Direct replacements within the same package and resolution include other LTC2641CMS8-12#PBF units or the industrial grade LTC2641IMS8-12#PBF if extended temperature range is needed. Cross-model substitution with LTC2642 requires circuit modification for bipolar operation.