LTC2642IDD-16#PBF

Overview

The LTC2642IDD-16#PBF is a 16-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) of ±1 LSB and differential nonlinearity (DNL) of ±1 LSB over temperature. It guarantees monotonic operation and includes an asynchronous clear pin that sets the output to midscale upon power-on reset or logic low activation.

Feature Summary

• 16-bit resolution with ±1 LSB INL and DNL guaranteed over temperature
• Unbuffered voltage output with 120µA typical supply current
• Bipolar capability via internal matched scaling resistors for external op amp configuration
• Asynchronous CLR pin clears DAC output to midscale

Applications

• Process control and industrial automation systems
• Automatic test equipment requiring high precision
• Data acquisition systems needing bipolar signal generation

Procurement Notes

Verify the package type matches the design requirements, as this specific part number corresponds to the 10-lead 3mm x 3mm DFN package. Confirm the operating temperature range aligns with the 'I' grade specification (-40°C to +85°C). Ensure the board layout accounts for the exposed ground pad thermal connection. Check for availability constraints as distribution status may vary by region.

Selection Notes

Select this component when bipolar output swing is required using an external amplifier, as the LTC2641 lacks the necessary RFB and INV pins. The unbuffered output architecture minimizes offset error but requires load resistance greater than 60kΩ to maintain linearity specifications. Verify that the system can accommodate the midscale power-up state if zero-scale initialization is critical at startup.

Part Context

This part belongs to the LTC2642 family, which offers 16-, 14-, and 12-bit resolutions. The 'IDD' suffix indicates the industrial temperature range and DFN package. The '#PBF' suffix denotes lead-free finish and RoHS compliance. It is distinct from the LTC2641, which provides only unipolar output without bipolar scaling resistors.

Replacement Considerations

The LTC2642ACDD-16#PBF serves as a commercial grade alternative with a 0°C to 70°C operating range. For tape and reel packaging, the LTC2642AIDD-16#TRPBF is available. Direct functional substitutes within the same family include lower resolution variants like the LTC2642CDD-14#PBF if 14-bit accuracy suffices.