LTC1968IMS8#PBF

Overview

The LTC1968IMS8#PBF is a true RMS-to-DC converter manufactured by Analog Devices Inc., utilizing delta-sigma computational techniques for high linearity and accuracy. It operates on a single power supply ranging from 4.5V to 5.5V, with a typical supply current of 2.3 mA. The device supports both single-ended and differential input signals, accommodating crest factors up to 4, with a common mode range that is rail-to-rail and a differential input range of 1V peak. It features a rail-to-rail output and includes a separate output reference pin for flexible level shifting. Packaged in an 8-MSOP format, it offers a bandwidth of 500 kHz for 1% additional gain error.

Feature Summary

• Utilizes delta-sigma conversion technology to achieve high linearity and amplitude-independent bandwidth
• Supports flexible input configurations including single-ended or differential signals with rail-to-rail common mode range
• Features a rail-to-rail output with a dedicated reference pin for easy system calibration and level shifting
• Includes an ultralow power shutdown mode reducing supply current significantly

Applications

• RMS current measurement for quartz crystal design circuits
• Precision signal conditioning in portable applications
• Power management systems requiring accurate RMS detection
• Industrial instrumentation requiring wide bandwidth and high linearity

Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the IMS8 variant corresponds to the industrial temperature range specifications. Ensure compatibility with the 8-MSOP package dimensions for PCB layout. Check for any recent product change notices regarding marking or material declarations. Validate availability status as distribution channels may report limited stock situations.

Selection Notes

Select this component when high linearity and wide bandwidth are critical for RMS conversion accuracy. The delta-sigma architecture provides superior performance compared to conventional log-antilog converters. Consider the 8-MSOP package size for space-constrained portable designs. Evaluate the need for differential inputs if common-mode noise rejection is required. Ensure the single-supply operation fits within the 4.5V to 5.5V system voltage constraints.

Part Context

The LTC1968 series represents Analog Devices' precision RMS-to-DC converter family. The IMS8#PBF designation specifies the industrial temperature grade and surface-mount MSOP packaging. This part belongs to the broader PMIC and signal conditioning portfolio, designed for applications demanding accurate power measurement and signal analysis without complex external calibration networks.

Replacement Considerations

Direct substitutes include other parts within the LTC1968 family such as the LTC1968CMS8#PBF, which shares identical electrical characteristics but differs in commercial temperature grading. Verify package compatibility and pinout alignment before substitution. No cross-model functional replacements are documented in official sources.