LTC2645CMS-L10#PBF

Overview

The LTC2645CMS-L10#PBF is a quad 10-bit PWM-to-voltage output DAC in a 16-lead MSOP package. It integrates a high-accuracy, low-drift 10ppm/°C reference with a full-scale output of 2.5V. The device converts PWM input signals to buffered voltage outputs within 8µs, eliminating the need for external analog filters. It operates on a single 2.7V to 5.5V supply and supports PWM input frequencies from 30Hz to 25kHz. Key electrical parameters include ±1LSB maximum DNL, ±1LSB maximum INL, and rail-to-rail output buffers capable of sourcing/sinking up to 5mA at 3V or 10mA at 5V.

Feature Summary

• Quad 10-bit resolution with integrated 10ppm/°C reference (2.5V full-scale)
• No-latency PWM-to-voltage conversion settling within 8µs
• Rail-to-rail output buffers with ±1LSB max DNL and ±1LSB max INL
• Pin-selectable idle mode states and internal/external reference options

Applications

• Digital calibration and trimming
• Process control and industrial automation
• Instrumentation level setting
• Automotive systems

Procurement Notes

Verify the suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the 'C' temperature grade corresponds to the commercial range of 0°C to 70°C. Ensure the ordering code matches the specific 10-bit resolution variant required for the design.

Selection Notes

Select this part when a compact solution for converting PWM signals to precise analog voltages is needed without external filtering components. The 10-bit resolution offers a balance between precision and speed. Consider the 2.5V internal reference limit; use external reference mode if higher output swings are required. Verify that the PWM input frequency stays within the 30Hz to 25kHz range for guaranteed accuracy.

Part Context

This component belongs to the LTC2645 family, which includes 12-bit, 10-bit, and 8-bit variants. All members share the same 16-lead MSOP footprint and functional architecture but differ in linearity specifications and update speeds. The CMS designation specifically identifies the commercial temperature grade version.

Replacement Considerations

Direct pin-compatible substitutes within the same family include the LTC2645CMS-L12#PBF (12-bit) and LTC2645CMS-L8#PBF (8-bit). These offer different resolution and linearity characteristics while maintaining identical pinouts and functionality.