LTC2644CMS-L12#TRPBF

Overview

The LTC2644CMS-L12#TRPBF is a dual-channel, 12-bit PWM-to-voltage digital-to-analog converter (DAC) manufactured by Analog Devices. It integrates a high-accuracy reference with a temperature coefficient of 10ppm/°C, providing a full-scale output voltage of 2.5V in internal reference mode. The device accepts PWM input signals and converts them to buffered analog voltages without latency, updating outputs within 8µs typically. It operates on a single supply voltage ranging from 2.7V to 5.5V and supports digital input voltages from 1.71V to 5.5V. Key electrical specifications include a maximum integral nonlinearity (INL) of ±2.5 LSB and a maximum differential nonlinearity (DNL) of ±1 LSB for the 12-bit resolution variant.

Feature Summary

• Dual-channel 12-bit PWM-to-voltage conversion with no latency updates
• Integrated 10ppm/°C precision reference yielding 2.5V full-scale output
• Rail-to-rail output buffers capable of sourcing/sinking up to 10mA at 5V
• Pin-selectable internal or external reference modes

Applications

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

Procurement Notes

Verify the specific suffix #TRPBF indicates a tape and reel packaging configuration containing 2,500 units. Confirm that the 'C' designation corresponds to the commercial temperature range of 0°C to 70°C. Ensure compatibility with the required PCB footprint for the 12-lead MSOP package before procurement.

Selection Notes

Select this component when low-latency PWM-to-voltage conversion is required without external filtering components. The 12-bit resolution provides ±2.5 LSB INL accuracy suitable for precision applications. Consider the power-down current of less than 1µA for battery-operated designs. Verify that the input PWM frequency does not exceed 6.25kHz for optimal 12-bit performance.

Part Context

This part belongs to the LTC2644 family, which includes variants with 10-bit and 8-bit resolutions (LTC2644-L10 and LTC2644-L8). The family shares the same 12-lead MSOP package and functional architecture but differs in linearity specifications and maximum operating PWM frequencies. The L12 variant offers the highest resolution within this specific package form factor.

Replacement Considerations

Direct pin-compatible replacements within the same family include the LTC2644-L10 and LTC2644-L8, though these offer lower resolution. For quad-channel requirements, the LTC2645 series serves as a functional equivalent with four channels instead of two.