LTC2642ACDD-16#PBF

Overview

The LTC2642ACDD-16#PBF is a 16-bit unbuffered voltage output digital-to-analog converter (DAC) from Analog Devices, housed in a 10-lead 3mm × 3mm 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 ±0.5 LSB INL/DNL accuracy over temperature. Key specifications include a 1µs settling time, 92 dB SNR, and a glitch impulse of 0.5nV·sec. It supports SPI/Microwire interfaces up to 50MHz and includes power-on reset functionality that clears the DAC output to midscale.

Feature Summary

• 16-bit resolution with ±0.5 LSB integral and differential nonlinearity error
• Unbuffered voltage output capable of driving loads greater than 60kΩ
• Integrated bipolar scaling resistors for use with external op amps
• Power-on reset circuit initializes output to midscale

Applications

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

Procurement Notes

Verify the specific ordering suffix '#PBF' indicates lead-free finish and RoHS compliance as per manufacturer standards. Confirm the 'AC' grade corresponds to the commercial temperature range of 0°C to 70°C. Ensure the DFN-10 package footprint matches the PCB layout requirements, specifically noting the exposed ground pad connection.

Selection Notes

Select this component when bipolar output capability is required alongside high-resolution unbuffered performance. The internal matched resistors simplify bipolar design compared to the LTC2641. Verify that the application can tolerate the unbuffered output impedance of approximately 6.2kΩ or if buffering is necessary for lower impedance loads.

Part Context

This part belongs to the LTC2642 family of 16-/14-/12-bit DACs. The 'A' suffix denotes the AC grade with extended temperature specifications relative to the C grade, while 'DD' specifies the 10-lead DFN package. It differs from the LTC2641 by including internal bipolar resistors and initializing to midscale upon power-up rather than zero scale.

Replacement Considerations

The LTC2642CDD-16#PBF is a compatible alternative within the same family, differing primarily in the operating temperature range (commercial vs. potentially wider depending on specific sub-grade verification). Direct pin-for-pin replacement requires verifying temperature range compatibility.