LTC2644CMS-L8#TRPBF

Overview

The LTC2644CMS-L8#TRPBF is a dual-channel, 8-bit PWM-to-voltage digital-to-analog converter (DAC) manufactured by Analog Devices. It features an integrated 10ppm/°C precision reference that establishes a 2.5V full-scale output range. The device converts pulse-width modulated signals into stable analog voltages with rail-to-rail buffered outputs capable of sourcing or sinking up to 5mA at 3V and 10mA at 5V. It operates on a single 2.7V to 5.5V supply and accepts PWM input frequencies up to 100kHz for the 8-bit resolution variant. The component settles to accuracy within 8µs and is housed in a 12-lead MSOP package.

Feature Summary

• Dual-channel 8-bit resolution with no latency PWM-to-voltage conversion
• Integrated 10ppm/°C reference providing 2.5V full-scale output
• Rail-to-rail output buffers supporting ±5mA (3V) or ±10mA (5V) load currents
• Pin-selectable idle mode states including power-down, hold, zero-scale, and full-scale

Applications

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

Procurement Notes

Verify the suffix #TRPBF indicates a tape and reel packaging format containing 2,500 pieces. Confirm the 'C' temperature grade designation corresponds to the commercial operating range of 0°C to 70°C. Ensure the ordering code matches the specific 8-bit resolution variant required for the design.

Selection Notes

Select this part when low-latency conversion from PWM signals is required without external filtering components. The 8-bit resolution supports PWM input frequencies up to 100kHz. Verify that the application requires the commercial temperature grade (0°C to 70°C); use the 'I' or 'H' suffixes if industrial or automotive ranges are necessary. Ensure the load current requirements do not exceed the specified sourcing and sinking capabilities.

Part Context

This component belongs to the LTC2644 family, which includes variants with 10-bit and 12-bit resolutions. The 'L8' designation specifically identifies the 8-bit resolution model with a 2.5V internal reference full-scale voltage. Other family members share similar pinouts and operational principles but offer higher resolution and different linearity specifications.

Replacement Considerations

Direct replacements within the same family include the LTC2644CMS-L10#TRPBF (10-bit) and LTC2644CMS-L12#TRPBF (12-bit). These parts maintain identical pin configurations and functionality but provide increased resolution. Verify that the system timing constraints accommodate the settling times associated with higher bit depths.