LTC2644CMS-L12#PBF

Overview

The LTC2644CMS-L12#PBF is a dual 12-bit PWM-to-voltage output DAC featuring an integrated 10ppm/°C reference. It converts PWM input signals into stable analog voltages with rail-to-rail buffered outputs, eliminating the need for external filters. The device operates on a single 2.7V to 5.5V supply and supports PWM inputs from 1.71V to 5.5V. Key electrical parameters include a typical settling time of 7.8µs to 12-bit accuracy, ±2.5LSB maximum INL, and ±1LSB maximum DNL. Supply current is typically 4.6mA at 5V, reducing to less than 1µA in power-down mode.

Feature Summary

• No latency PWM-to-voltage conversion with updates occurring after each rising edge
• Integrated high-accuracy 10ppm/°C reference providing 2.5V full-scale output
• Rail-to-rail output buffers capable of sourcing/sinking up to 10mA (5V) or 5mA (3V)
• Pin-selectable internal or external reference modes

Applications

• Digital calibration systems
• Trimming and adjustment circuits
• Level setting applications
• Process control and industrial automation
• Instrumentation and automotive electronics

Procurement Notes

Verify the specific suffix #PBF indicates tube packaging rather than tape and reel. Confirm the temperature grade 'C' corresponds to the commercial range of 0°C to 70°C. Ensure the ordering code matches the 12-bit resolution variant. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm availability and revision status.

Selection Notes

Select this model for applications requiring 12-bit resolution and low drift. The internal reference provides a fixed 2.5V full-scale output; use external reference mode if a different voltage span is needed. Consider the 7.8µs settling time for dynamic signal requirements. Ensure the PWM input frequency does not exceed 6.25kHz for guaranteed 12-bit performance.

Part Context

This component belongs to the LTC2644 family, which includes 8-bit and 10-bit variants. The CMS designation identifies the 12-lead MSOP package and commercial temperature grade. It serves as a direct replacement for discrete PWM filtering solutions, offering higher precision and smaller footprint compared to passive RC filter networks.

Replacement Considerations

Publicly confirmed substitutes within the same family include LTC2644CMS-L10#PBF (10-bit) and LTC2644CMS-L8#PBF (8-bit). These share identical pinouts and functionality but offer lower resolution. Verify that the reduced bit depth meets the application's accuracy requirements before substitution.