LTC2645HMS-L12#TRPBF

Overview

The LTC2645HMS-L12#TRPBF is a quad 12-bit PWM-to-voltage output DAC from Analog Devices, housed in a 16-lead MSOP package. It features an integrated 10ppm/°C reference providing a 2.5V full-scale output. The device converts PWM input signals to buffered voltage outputs with no latency, updating and settling within 8µs typically. It supports single supply voltages from 2.7V to 5.5V and digital inputs from 1.71V to 5.5V. Key electrical parameters include ±2.5LSB maximum INL, ±1LSB maximum DNL, and a typical supply current of 4mA at 3V. The part operates reliably across the automotive temperature range of –40°C to 125°C.

Feature Summary

• Quad 12-bit resolution with rail-to-rail buffered voltage outputs
• No latency PWM-to-voltage conversion with 8µs typical settling time
• Integrated 10ppm/°C reference yielding 2.5V full-scale output
• Pin-selectable internal or external reference modes
• Guaranteed monotonic operation over the full temperature range

Applications

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

Procurement Notes

Verify the #TRPBF suffix indicates a tape and reel packaging format containing 2,500 units per reel. Confirm the H suffix corresponds to the automotive temperature grade (–40°C to 125°C) and the L12 designation specifies the 12-bit resolution with a 2.5V internal reference full-scale voltage. Ensure compatibility with the 16-lead MSOP physical footprint during procurement planning.

Selection Notes

Select this component when a low-latency, multi-channel DAC is required directly from PWM signals without external filtering. The LTC2645HMS-L12#TRPBF is suitable for applications demanding high accuracy (±2.5LSB INL) and stability (10ppm/°C drift). Consider the 4mA typical current consumption and the ability to source/sink up to 10mA at 5V for load driving requirements. Verify that the PWM input frequency remains within the 6.25kHz limit for 12-bit accuracy.

Part Context

This part belongs to the LTC2645 family, which offers 12-, 10-, and 8-bit resolutions in the same 16-lead MSOP package. The 'H' denotes the extended automotive temperature range, while 'L12' specifies the 12-bit version with a 2.5V internal reference. The '#TRPBF' suffix identifies the specific tape-and-reel packaging variant manufactured by Analog Devices.

Replacement Considerations

Direct replacements within the same family include LTC2645HMS-L10#TRPBF (10-bit) and LTC2645HMS-L8#TRPBF (8-bit), which share pinouts and functionality but offer lower resolution. For external reference configurations, the LTC2645HMS-L12#PBF tube variant is available.