LTC1966CMS8#TRPBF

Overview

The LTC1966CMS8#TRPBF is a precision micro-power true RMS-to-DC converter utilizing patented delta-sigma computation technology. It operates on a single supply voltage ranging from 2.7V to 5.5V or dual supplies up to ±5.5V, with a typical supply current of 155µA and a maximum of 170µA. The device features a rail-to-rail common-mode input range and supports differential inputs up to 1V peak for superior linearity. It offers a constant bandwidth of 800kHz (-3dB) and 6kHz (±1%), independent of input voltage. Gain accuracy is specified at 0.1% between 50Hz and 1kHz, with total error at 0.25%. The component is housed in an 8-pin MSOP package.

Feature Summary

• Employs delta-sigma calculation technology for accurate true RMS conversion with simplified external requirements.
• Provides high linearity allowing for straightforward system calibration across various input voltages.
• Features flexible input options supporting both single-ended and differential signals for EMI/RFI suppression.
• Includes rail-to-rail output with an independent reference pin to enable flexible level shifting.

Applications

• True RMS digital multimeters
• Panel meters requiring precise AC+DC measurements
• Portable instrumentation systems

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing. Confirm the manufacturer is Analog Devices Inc., formerly Linear Technology. Ensure the order matches the exact part number to guarantee the correct package type and operational specifications. Cross-reference datasheets for any recent product change notifications regarding material declarations or marking changes.

Selection Notes

Select this component for applications demanding high accuracy and low power consumption in portable devices. The delta-sigma architecture simplifies design by reducing external component count compared to traditional log-antilog converters. Consider the wide supply voltage range and low shutdown current for battery-operated systems requiring extended life and flexible power management.

Part Context

This part belongs to the LTC1966 series of RMS-to-DC converters manufactured by Analog Devices Inc. It is designed as a drop-in replacement for older logarithmic converters while offering improved performance metrics. The device is actively produced and available in surface-mount packages suitable for automated assembly processes in modern electronic manufacturing.

Replacement Considerations

Direct substitutes include other parts within the LTC1966 family, such as the LTC1966CMS8#PBF, which shares identical electrical characteristics but differs in packaging format. Verify compatibility with existing PCB footprints when switching between tube and reel variants.

FAQ

Does the LTC1966 support differential inputs?

Yes, the device accepts differential inputs up to 1V peak, which helps suppress EMI/RFI noise and provides superior linearity compared to single-ended configurations.

What is the shutdown current specification?

The LTC1966 features a low-power shutdown mode that reduces the supply current to 0.5µA, with some documentation citing a maximum of 0.1µA in this state.