LTC2642CDD-12#TRPBF

Overview

The LTC2642CDD-12#TRPBF is a 12-bit unbuffered voltage output digital-to-analog converter (DAC) from Analog Devices. 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 16-bit accuracy, and a glitch impulse of 0.5nV•sec. It is housed in a 10-lead 3mm × 3mm DFN package and includes an asynchronous clear pin that resets the output to midscale.

Feature Summary

• 12-bit resolution with ±0.5 LSB INL and DNL guarantees monotonic operation over temperature.
• Low power consumption of 120µA typical supply current enables battery-operated applications.
• Fast 1µs settling time and low 0.5nV•sec glitch impulse for high-speed signal processing.
• Integrated bipolar scaling resistors allow generation of ±VREF output swing with an external op amp.

Applications

• Process control and industrial automation systems
• Automatic test equipment requiring precise voltage references
• Data acquisition systems needing high-resolution analog outputs

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 for the exposed ground pad connection.

Selection Notes

Select this model for applications requiring bipolar output capability via external amplification, unlike the LTC2641 which is unipolar only. Choose the 12-bit variant when system noise or resolution requirements do not necessitate 14 or 16 bits, allowing for lower power usage. Verify that the load impedance connected to VOUT exceeds 60kΩ to maintain specified linearity without buffering.

Part Context

This component belongs to the LTC2641/LTC2642 family of high-performance DACs. The LTC2642 variant specifically distinguishes itself by including internal matched scaling resistors (RFB and INV) designed for bipolar operation with external operational amplifiers. The CDD suffix denotes the 10-lead 3mm × 3mm DFN package, while TRPBF specifies the tape and reel delivery format.

Replacement Considerations

LTC2642CDD-12#PBF: Identical electrical performance but supplied in tube packaging instead of tape and reel.