LTC2645HMS-L10#TRPBF

Overview

The LTC2645HMS-L10#TRPBF is a quad 10-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 into stable analog voltages with typical settling times of 7.4µs to 10-bit accuracy. It operates on a single 2.7V to 5.5V supply and supports PWM inputs from 1.71V to 5.5V. Key specifications include ±1 LSB maximum DNL, ±2.5 LSB maximum INL, and rail-to-rail buffered outputs capable of sourcing/sinking up to 10mA at 5V.

Feature Summary

• Quad 10-bit resolution with no latency PWM-to-voltage conversion
• Integrated 10ppm/°C reference for 2.5V full-scale output
• Settles to 10-bit accuracy within 7.4µs after PWM rising edge
• Pin-selectable internal or external reference modes

Applications

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

Procurement Notes

Verify the specific suffix #TRPBF indicates a tape and reel packaging format containing 2,500 units. Confirm the 'H' temperature grade designation corresponds to the automotive range of –40°C to 125°C. Ensure compatibility with the required 16-lead MSOP footprint during procurement planning.

Selection Notes

Select this model for applications requiring four independent voltage outputs driven by PWM signals without external filters. The 10-bit resolution balances precision and speed. Consider the internal reference for space-constrained designs; otherwise, use external reference mode via REFSEL to match system voltage requirements.

Part Context

This component belongs to the LTC2645 family, which includes 12-bit (LTC2645-L12) and 8-bit (LTC2645-L8) variants. All variants share the same 16-lead MSOP package and functional architecture but differ in linearity specifications and maximum operating PWM frequencies.

Replacement Considerations

Direct substitutes within the same family include LTC2645HMS-L12#TRPBF for higher resolution or LTC2645HMS-L8#TRPBF for higher frequency tolerance. Cross-family replacements require verification of interface compatibility and pinout alignment.

FAQ

What is the maximum PWM input frequency for this 10-bit variant?

The maximum guaranteed PWM input frequency for the LTC2645-L10 is 25kHz.

How does the IDLSEL pin affect the output when the PWM signal stops?

Connecting IDLSEL to GND sets the output to zero-scale or full-scale based on the idle state. Connecting it to VCC holds the last updated voltage value indefinitely.

Can the device operate with an external reference voltage?

Yes, by connecting the REFSEL pin to VCC, the REF pin becomes an input allowing an external reference voltage between 1V and VCC to set the full-scale output.