LTC2645IMS-L8#PBF

Overview

The Analog Devices LTC2645IMS-L8#PBF is a quad 8-bit PWM-to-voltage output DAC housed in a 16-lead MSOP package. It integrates a high-accuracy, low-drift 10ppm/°C reference, providing a full-scale output of 2.5V. The device measures PWM period and pulse width, updating outputs after each rising edge with typical settling to 8-bit accuracy within 7µs. It operates on a single 2.7V to 5.5V supply, supports rail-to-rail buffered voltage outputs capable of sourcing/sinking up to 5mA at 3V or 10mA at 5V, and features pin-selectable internal or external reference modes.

Feature Summary

• Quad 8-bit resolution with ±0.5 LSB maximum DNL and ±0.05 LSB maximum INL
• Integrated 10ppm/°C temperature coefficient reference yielding 2.5V full-scale output
• Fast update rate with typical 7µs settling time to 8-bit accuracy following PWM rising edges
• Rail-to-rail buffered voltage outputs with 5mA (3V) / 10mA (5V) drive capability

Applications

• Digital calibration systems
• Trimming and adjustment circuits
• Process control and industrial automation
• Automotive instrumentation

Procurement Notes

Verify the suffix #PBF indicates a lead-free tube package rather than tape and reel. Confirm the IMS designation corresponds to the 16-lead MSOP plastic package. Ensure the L8 suffix matches the required 8-bit resolution for the specific design needs.

Selection Notes

Select this part when an 8-bit resolution is sufficient for the application. Choose the internal reference mode by connecting REFSEL to GND for a fixed 2.5V full-scale range. Use external reference mode via VCC connection if a different full-scale voltage is required. Ensure PWM input frequencies remain below 100kHz for guaranteed performance.

Part Context

This component belongs to the LTC2645 family, which also includes 10-bit (LTC2645-L10) and 12-bit (LTC2645-L12) variants. All versions share the same 16-lead MSOP footprint and functional architecture, differing primarily in resolution and linearity specifications. The L8 variant offers the highest linearity precision among the three options.

Replacement Considerations

The LTC2645IMS-L8#TRPBF serves as a functional equivalent with identical electrical characteristics but differs in packaging format (tape and reel vs. tube). Other resolutions within the LTC2645 series are pin-compatible but offer different bit depths.