LTC2645CMS-L12#PBF

Overview

The LTC2645CMS-L12#PBF is a quad 12-bit PWM-to-voltage output DAC in a 16-lead MSOP package. It features an integrated 10ppm/°C reference providing a 2.5V full-scale output. The device converts PWM inputs to buffered analog voltages within 8µs, eliminating the need for external filters. It operates on a single 2.7V to 5.5V supply with rail-to-rail outputs capable of sourcing/sinking up to 5mA at 3V or 10mA at 5V. Key specifications include ±2.5LSB max INL, guaranteed monotonicity, and pin-selectable idle states.

Feature Summary

• Quad 12-bit resolution with integrated 10ppm/°C reference (2.5V FS)
• Fast conversion: Settles to 12-bit accuracy within 8µs
• Rail-to-rail output buffers with 5mA/10mA drive capability
• Pin-selectable idle modes (Zero-Scale, Full-Scale, Hi-Z, Hold)

Applications

• Digital Calibration
• Trimming and Adjustment
• Level Setting
• Process Control and Industrial Automation

Procurement Notes

Verify the suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the 'C' temperature grade corresponds to the commercial range of 0°C to 70°C. Ensure the 'MS' package designation matches the required 16-lead MSOP footprint for PCB layout compatibility.

Selection Notes

Select this part for applications requiring direct PWM-to-analog conversion without latency. The 12-bit resolution suits precision calibration tasks. Consider the internal reference if board space is limited; otherwise, use REFSEL for external references. Ensure PWM input frequencies remain below 6.25kHz for optimal 12-bit accuracy.

Part Context

This component belongs to the LTC2645 family, which includes 10-bit and 8-bit variants. The CMS-L12 designation specifies the Commercial temperature grade, MSOP package, and 12-bit resolution. It serves as a drop-in replacement for discrete PWM filter solutions in industrial control systems.

Replacement Considerations

Direct substitutes include other parts from the LTC2645 family with different resolutions (e.g., LTC2645-L10) or temperature grades (e.g., LTC2645I). Cross-family replacements require verification of pin compatibility and electrical parameter alignment.