LTC1966IMS8

Overview

The LTC1966IMS8#PBF is a precision micro-power true RMS-to-DC converter manufactured by Analog Devices Inc. It utilizes an innovative patented delta-sigma computational technique to achieve high accuracy and low power consumption. The device accepts single-ended or differential inputs with a rail-to-rail common-mode range and supports peak factors up to 4. It operates on a single supply voltage ranging from 2.7V to 5.5V, or dual supplies up to ±5.5V. Key electrical parameters include a typical supply current of 155µA (maximum 170µA) and an ultra-low shutdown current of 0.1µA. Gain accuracy is specified at 0.1% between 50Hz and 1kHz, with a total error of 0.25%. The component features a constant bandwidth of 800kHz (-3dB) and 6kHz (±1%), unaffected by input voltage. It is housed in a space-saving 8-pin MSOP package.

Feature Summary

• Employs patented delta-sigma computational technology for true RMS-to-DC conversion, eliminating the need for complex external circuitry.
• Offers superior linearity with 0.02% distortion, allowing for simplified system calibration across all input voltages.
• Provides flexible input and output configurations, including rail-to-rail outputs and independent output reference pins for level shifting.
• Features extremely low power consumption with a standard operating current of 155µA and a shutdown mode drawing only 0.1µA.

Applications

• True RMS digital multimeters
• Panel meters requiring AC+DC measurement
• Portable battery-powered instrumentation

Procurement Notes

Verify the complete part number includes the suffix #PBF to ensure compliance with RoHS directives and lead-free manufacturing standards. Confirm the package variant matches the required 8-MSOP footprint for PCB layout compatibility. Check the specific temperature grade suffix if operation outside the commercial range is required. Ensure the ordering quantity aligns with tube packaging specifications provided by authorized distributors. Validate that the source document corresponds directly to Analog Devices Inc. to avoid counterfeit components.

Selection Notes

Select this component when high accuracy and low power are critical for RMS measurements. The delta-sigma architecture simplifies design compared to traditional log-antilog converters. Consider the 8-MSOP package for space-constrained portable applications. Evaluate the 2.7V to 5.5V supply range against system power constraints. The differential input option provides EMI/RFI suppression capabilities for noisy environments.

Part Context

The LTC1966 belongs to Analog Devices' family of signal conditioning integrated circuits designed for precision measurement applications. It replaces older logarithmic RMS-to-DC converters by offering improved accuracy and lower power usage through computational techniques. The IMS8 suffix denotes the specific surface-mount package style used in compact electronic designs.

Replacement Considerations

Publicly confirmed substitute part numbers were not identified in the provided documentation. Verify compatibility with existing circuit designs before considering alternative manufacturers.