LTC2644HMS-L8#PBF

Overview

The LTC2644HMS-L8#PBF is a dual 8-bit PWM-to-voltage digital-to-analog converter (DAC) from Analog Devices, housed in a 12-lead MSOP package. It features an integrated 10ppm/°C reference providing a 2.5V full-scale output or supports external references. The device converts PWM input signals into buffered voltage outputs with no latency, updating within 7.4µs typically. It operates on a single 2.7V to 5.5V supply, draws 4.6mA at 5V, and guarantees monotonicity. Key specifications include ±0.5LSB maximum DNL, ±0.05LSB maximum INL, and rail-to-rail output capability sourcing/sinking up to 5mA at 3V.

Feature Summary

• Dual 8-bit resolution with pin-selectable internal (2.5V) or external reference
• No-latency PWM-to-voltage conversion settling within 7.4µs
• Rail-to-rail output buffers capable of ±5mA (3V) or ±10mA (5V)
• Guaranteed monotonic operation with ±0.5LSB max DNL and ±0.05LSB max INL

Applications

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

Procurement Notes

Verify the suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the H temperature grade (-40°C to 125°C) matches the operational environment requirements. Ensure the MSOP-12 package dimensions align with PCB footprint constraints. Check for specific shipping container labeling regarding temperature grades as noted in manufacturer documentation.

Selection Notes

Select this model for applications requiring high accuracy (±0.05LSB INL) and fast response times compared to higher-resolution variants. The 8-bit resolution limits output granularity but allows for higher PWM input frequencies up to 100kHz. Choose the H-grade variant for automotive or wide-temperature industrial environments. Consider the internal reference for simplified design or external reference for custom full-scale voltages.

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. The L8 variant offers the highest speed capability among the family.

Replacement Considerations

Direct functional substitutes within the same family include LTC2644HMS-L10#PBF and LTC2644HMS-L12#PBF, offering higher resolutions but lower maximum PWM frequencies. For quad-channel requirements, consider the LTC2645 series. Verify that any replacement maintains the 12-lead MSOP package and compatible thermal characteristics.