The LTC1967 is a precision, micropower RMS-to-DC converter from Linear Technology (now Analog Devices). It computes the true RMS value of any complex input waveform. Its performance rivals that of expensive benchtop instruments, making accurate RMS measurement available in space-sensitive and power-conscious applications. The CMS8 indicates the package type: Ceramic Micro Small Outline Package (MSOP) with 8 leads.

Applications:

• Portable Instrumentation: Accurate RMS measurement in handheld multimeters and data loggers.
• Process Control: Monitoring and control of AC signals in industrial automation systems.
• Power Monitoring: Measuring AC line voltage and current for power management applications.
• Vibration Analysis: Computing RMS values of accelerometer signals for condition monitoring.
• Audio Level Measurement: Precisely determining the RMS power of audio signals.

Features:

• True RMS-to-DC Conversion: Accurately measures the RMS value of complex waveforms, regardless of shape.
• Wide Input Voltage Range: Handles input signals from millivolts to several volts RMS.
• Micropower Operation: Low supply current (typically 170μA) maximizes battery life in portable applications.
• High Accuracy: Provides accurate RMS measurements with minimal error.
• Low External Component Count: Requires only a few external components for operation.
• Adjustable Averaging Time: Allows for optimizing the response time based on the application requirements.
• 8-Lead MSOP Package: Small package size is suitable for space-constrained applications.

Benefits:

• Accurate RMS Measurement: Provides reliable and accurate measurement of RMS values, crucial for precise signal analysis.
• Long Battery Life: Micropower operation extends the operating time of battery-powered devices.
• Simplified Design: Low external component count simplifies the design process and reduces development time.
• Versatile Application: Suitable for a wide range of applications requiring accurate RMS measurement.

Additional Details:

The LTC1967 typically operates from a single 2.7V to 5.5V power supply. The output voltage is proportional to the RMS value of the input signal. The averaging time can be adjusted using an external capacitor, allowing for optimizing the response time and ripple. The MSOP package provides excellent thermal performance for its size. The device incorporates internal trimming for high accuracy and minimal offset. The datasheet provides detailed specifications including pin configurations, electrical characteristics, and application circuit examples.