LTC2642CDD-14#TRPBF

Overview

The LTC2642CDD-14#TRPBF is a 14-bit unbuffered voltage output digital-to-analog converter (DAC) from Analog Devices, housed in a 10-lead 3mm × 3mm plastic DFN package. It operates on a single 2.7V to 5.5V supply with a typical current consumption of 120µA. The device features a 3-wire SPI/MICROWIRE compatible serial interface supporting 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 0.5 LSB, and a glitch impulse of 0.5 nV·sec. The part guarantees monotonic operation over temperature and includes an asynchronous clear pin that resets the output to midscale.

Feature Summary

• 14-bit resolution with ±0.5 LSB INL and DNL errors
• Unbuffered voltage output driving loads >60kΩ without linearity degradation
• Bipolar capability via internal matched scaling resistors for external op amp configuration
• Power-on reset clears DAC output to midscale; CLR pin provides asynchronous midscale reset

Applications

• Process control and industrial automation systems
• Automatic test equipment requiring high precision
• Data acquisition systems needing low power consumption

Procurement Notes

Verify the #TRPBF suffix indicates tape and reel packaging rather than tube packaging. Confirm the C grade corresponds to the commercial operating temperature range of 0°C to 70°C. Ensure the 10-lead DFN footprint matches the PCB layout requirements, specifically noting the exposed ground pad connection.

Selection Notes

Select this model for applications requiring bipolar output swings using an external amplifier, as the LTC2642 includes internal RFB and INV pins for this purpose. Choose the 14-bit variant when full 16-bit accuracy is unnecessary but higher resolution than 12-bit is required. Verify that the system can accommodate the unbuffered output impedance of approximately 6.2kΩ or provide buffering if lower output impedance is needed.

Part Context

This component belongs to the LTC2642 family of 16-, 14-, and 12-bit voltage output DACs. The 'C' designation specifies the commercial temperature range, while 'IDD' would indicate the industrial range (-40°C to 85°C). The 'DD' suffix identifies the 10-lead 3mm × 3mm DFN package, distinct from the MSOP or obsolete SO packages available in the same series.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.