LTC2645CMS-L8#PBF

Overview

The LTC2645CMS-L8#PBF is a quad 8-bit PWM-to-voltage output DAC from Analog Devices Inc., 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 to update voltage outputs within 8µs typically. It operates on a single 2.7V to 5.5V supply with rail-to-rail buffered outputs capable of sourcing/sinking up to 5mA at 3V or 10mA at 5V. Key specifications include ±0.5LSB maximum DNL and ±0.05LSB maximum INL for the 8-bit variant.

Feature Summary

• Quad 8-bit resolution with pin-selectable internal (2.5V) or external reference
• No latency PWM-to-voltage conversion updating within 8µs
• Rail-to-rail output buffers supporting up to 10mA load current
• Guaranteed monotonic operation across temperature range

Applications

• Digital calibration systems
• Trimming and adjustment circuits
• Process control and industrial automation
• Instrumentation level setting

Procurement Notes

Verify the suffix #PBF indicates tube packaging rather than tape and reel. Confirm the 'C' grade corresponds to the commercial temperature range of 0°C to 70°C. Ensure the 'L8' designation matches the required 8-bit resolution and 2.5V full-scale specification.

Selection Notes

Select this part for applications requiring direct PWM input without external filters. The 8-bit resolution suits moderate precision needs. Consider the 'I' or 'H' grade if operating temperatures exceed 70°C or require -40°C start-up. External reference mode reduces power consumption compared to the internal reference.

Part Context

This component belongs to the LTC2645 family, which includes 12-bit and 10-bit variants. The CMS-L8#PBF specifically denotes the Commercial temperature grade, MSOP package, 8-bit resolution, and Tube packaging format. It replaces discrete filter solutions for PWM signal conditioning.

Replacement Considerations

The LTC2645IMS-L8#TRPBF offers identical electrical performance but differs in packaging (Tape & Reel vs. Tube) and temperature grade (Industrial vs. Commercial). Verify thermal requirements before substituting.