LTC2645IMS-L12#TRPBF

Overview

The LTC2645IMS-L12#TRPBF is a quad 12-bit PWM-to-voltage output DAC from Analog Devices Inc., housed 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 measures PWM period and pulse width, updating outputs within 8µs typically. It operates on a single 2.7V to 5.5V supply, supports IOVCC from 1.71V to 5.5V, and features rail-to-rail buffered outputs capable of sourcing/sinking up to 5mA (3V) or 10mA (5V). Key specifications include ±2.5LSB max INL, ±1LSB max DNL, and guaranteed monotonicity over the industrial temperature range of –40°C to 85°C.

Feature Summary

• Quad 12-bit resolution with no latency PWM-to-voltage conversion
• Integrated 10ppm/°C precision reference providing 2.5V full-scale output
• Settles to 12-bit accuracy within 8µs after PWM rising edge
• Pin-selectable internal or external reference modes
• Guaranteed monotonic operation from –40°C to 85°C

Applications

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

Procurement Notes

Verify the suffix #TRPBF indicates a tape and reel packaging format containing 2,500 units. Confirm the IMS designation corresponds to the 16-lead MSOP package and the I grade specifies the –40°C to 85°C operating temperature range. Ensure compatibility with the required PWM input voltage levels relative to IOVCC.

Selection Notes

Select this part for applications requiring direct PWM input without external filtering or buffering. The 12-bit resolution suits high-precision needs, while the integrated reference simplifies board space. Consider the 8µs settling time for dynamic signal requirements. Verify that the load current stays within the 5mA (3V) or 10mA (5V) sourcing/sinking limits to maintain specified linearity.

Part Context

This component belongs to the LTC2645 family, which offers 12-, 10-, and 8-bit resolutions. The L12 variant provides the highest precision with ±2.5LSB INL. Other variants like LTC2645-L10 and LTC2645-L8 offer lower resolutions with tighter linearity specs (±1LSB and ±0.5LSB INL respectively) but share the same package and interface characteristics.

Replacement Considerations

Publicly confirmed substitutes include the LTC2645IMS-L12#PBF (tube packaging) and other resolution variants within the LTC2645 family such as LTC2645IMS-L10#TRPBF or LTC2645IMS-L8#TRPBF if lower resolution is acceptable.