LTC1966CMS8#PBF

Overview

The LTC1966CMS8#PBF is a precision, micropower true RMS-to-DC converter utilizing patented delta-sigma computational technology. It operates on a single supply voltage ranging from 2.7V to 5.5V or dual supplies up to ±5.5V. The device features a typical supply current of 155µA and reduces to 0.5µA in shutdown mode. It accepts single-ended or differential inputs with rail-to-rail common-mode range and supports peak factors up to 4. The component provides a rail-to-rail output with an independent reference pin for level shifting. It is housed in an 8-pin MSOP package.

Feature Summary

• Employs delta-sigma computational technique for high-accuracy true RMS-to-DC conversion
• Supports both single-ended and differential input configurations for EMI/RFI suppression
• Features flexible power options including single or dual supply operation
• Includes independent output reference pin enabling flexible level shifting

Applications

• True RMS digital multimeters
• Panel meters
• Handheld measurement devices
• AC+DC true RMS measurements

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and tube packaging when sourcing. Confirm the manufacturer is Analog Devices Inc., formerly Linear Technology. Ensure the operating temperature range matches the application requirements. Check for active status availability through authorized distributors. Validate that the 8-MSOP package dimensions fit the PCB layout constraints.

Selection Notes

Select this component for applications requiring high linearity and low power consumption in RMS-to-DC conversion tasks. The delta-sigma architecture simplifies system calibration compared to traditional log-antilog converters. Consider the 155µA supply current for battery-operated portable devices. The wide input dynamic range and support for differential signals make it suitable for noisy environments. Evaluate the need for level shifting capabilities provided by the independent output reference.

Part Context

This part belongs to the LTC1966 family of precision RMS-to-DC converters manufactured by Analog Devices Inc. It represents a modern solution replacing older logarithmic amplifier-based designs. The device integrates advanced computational techniques to achieve superior accuracy and flexibility. It is designed for use in measurement instrumentation where size and power efficiency are critical constraints.

Replacement Considerations

Check for direct substitutes within the Analog Devices portfolio that share the same functional specifications and pinout compatibility. Verify if alternative packages such as SOIC-8 variants exist for the same core device. Ensure any replacement maintains the required RMS-to-DC conversion accuracy and bandwidth characteristics.