LTC2644IMS-L8#TRPBF

Overview

The LTC2644IMS-L8#TRPBF is a dual 8-bit PWM-to-voltage output DAC featuring an integrated 10ppm/°C reference. It converts PWM input signals into buffered voltage outputs with no latency, updating within 7.4µs typically. 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 ±0.5 LSB maximum DNL, ±0.05 LSB maximum INL, and a full-scale output of 2.5V using the internal reference. Supply current is 2.7mA at 3V, dropping below 1µA in power-down mode.

Feature Summary

• No latency PWM-to-voltage conversion with updates settling within 8µs
• Integrated 10ppm/°C reference providing 2.5V full-scale output
• Pin-selectable internal or external reference modes
• Rail-to-rail output buffers capable of sourcing/sinking up to 5mA (3V) or 10mA (5V)

Applications

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

Procurement Notes

Verify the suffix #TRPBF indicates a tape and reel packaging format containing 2,500 pieces. Confirm the IMS designation corresponds to the industrial temperature grade (-40°C to 85°C) and MSOP-12 package. Ensure compatibility with the required PWM input frequency range for 8-bit resolution, which extends up to 100kHz.

Selection Notes

Select this part for applications requiring direct PWM-to-voltage conversion without external filters. The 8-bit resolution supports PWM frequencies up to 100kHz, higher than the 10-bit or 12-bit variants. Choose the internal reference mode for simplified design or external reference mode if a specific full-scale voltage other than 2.5V is required via the REF pin.

Part Context

This component belongs to the LTC2644 family, which includes 12-bit (LTC2644-L12), 10-bit (LTC2644-L10), and 8-bit (LTC2644-L8) versions. All variants share the same 12-lead MSOP package and core architecture but differ in linearity specifications and maximum supported PWM input frequencies.

Replacement Considerations

Direct functional replacements within the same family include LTC2644IMS-L10#TRPBF and LTC2644IMS-L12#TRPBF, noting differences in resolution and max PWM frequency. Other Analog Devices dual PWM DACs may require interface and performance verification.