LTC2641CDD-16#PBF

Overview

The LTC2641CDD-16#PBF is a single-channel, 16-bit unbuffered voltage output digital-to-analog converter (DAC) from Analog Devices. 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 serial interface compatible with SPI, QSPI, and Microwire standards, supporting clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±1LSB over temperature, a settling time of 1µs to 16 bits, and a glitch impulse of 0.5nV·sec. The DAC output swings from 0V to the reference voltage (VREF), which must be between 2V and VDD.

Feature Summary

• 16-bit resolution with guaranteed monotonic operation over temperature
• Unbuffered voltage output with low offset error of ±1LSB
• Fast 1µs settling time and 50MHz serial clock rate
• Power-on reset clears DAC output to zero scale

Applications

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

Procurement Notes

Verify the package type matches the design requirements, as this specific part number uses an 8-lead DFN package. Confirm that the commercial temperature range (0°C to 70°C) aligns with the system's operational environment. Ensure the external reference voltage stays within the specified 2V to VDD range for proper functionality.

Selection Notes

Select this component when high linearity (±1LSB INL) and low power consumption are critical. The unbuffered output requires loads greater than 60kΩ to maintain accuracy; use an external op-amp buffer if driving lower impedance loads. For bipolar output requirements, consider the LTC2642 family instead, as the LTC2641 provides only unipolar output.

Part Context

This part belongs to the LTC2641/LTC2642 family of precision DACs. The 'C' suffix indicates the commercial temperature grade (0°C to 70°C). The 'D' in CDD denotes the 3mm × 3mm DFN package. The '#PBF' suffix signifies lead-free finish and tube packaging. Other variants exist with different resolutions (12/14-bit) or industrial temperature grades ('I').

Replacement Considerations

Direct pin-compatible replacements within the same package include other LTC2641 variants such as LTC2641CDD-14#PBF or LTC2641CDD-12#PBF, though these offer lower resolution. Industrial grade equivalents like LTC2641IDD-16#PBF provide the same electrical performance but over a wider temperature range (-40°C to 85°C).