LTC2642ACDD-16#TRPBF

Overview

The LTC2642ACDD-16#TRPBF is a 16-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 supply of 2.7V to 5.5V with a typical supply current of 120µA. The device features an external reference input range of 2V to VDD and provides a bipolar output capability via internal matched scaling resistors connected to an external op amp. It utilizes a 3-wire SPI/Microwire compatible serial interface with clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) of ±1LSB and differential nonlinearity (DNL) of ±1LSB over temperature, a settling time of 1µs to 16 bits, and a glitch impulse of 0.5nV·sec.

Feature Summary

• 16-bit resolution with ±1LSB INL and DNL guaranteed over temperature
• Bipolar operation support via internal matched scaling resistors for external amplifier configuration
• Low power consumption with 120µA typical supply current and 1µs settling time
• 50MHz SPI/Microwire compatible 3-wire serial interface with Schmitt-trigger inputs

Applications

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

Procurement Notes

Verify the ordering suffix #TRPBF indicates tape and reel packaging, distinct from the tube-packaged #PBF variant. Confirm the 'A' grade designation corresponds to the specified ±1LSB INL/DNL performance over the commercial temperature range. Ensure the 10-lead DFN footprint matches the PCB layout requirements, specifically noting the exposed ground pad connection.

Selection Notes

Select this component when bipolar output swing is required without external resistor networks, utilizing the internal RFB and INV pins. Compare against the LTC2641 if only unipolar output is needed, as the LTC2642 includes additional pins for bipolar scaling. Verify that the load impedance exceeds 60kΩ to maintain linearity specifications in unbuffered mode, or add an external buffer if lower impedance driving is necessary.

Part Context

This part belongs to the LTC2641/LTC2642 family of 16-/14-/12-bit DACs. The LTC2642 variant is distinguished by its 10-lead package and integrated bipolar scaling resistors, whereas the LTC2641 uses an 8-lead package for unipolar applications. Both share identical core architecture, serial interface protocols, and power characteristics within the same physical footprint constraints.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical parameter equivalence with other Analog Devices 16-bit DACs if cross-referencing is required.