Features

• High Linearity:
  0.02% Linearity Allows Simple System Calibration
• Wide Input Bandwidth:
  Bandwidth to 0.1% Additional Gain Error: 40kHz
  Bandwidth Independent of Input Voltage Amplitude
• No-Hassle Simplicity:
  True RMS-DC Conversion with Only One External Capacitor
  Delta Sigma Conversion Technology
• Low Supply Current:
  330µA Typ
• Ultralow Shutdown Current:
  0.1µA
• Flexible Inputs:
  Differential or Single Ended
  Rail-to-Rail Common Mode Voltage Range
  Up to 1V_PEAK Differential Voltage
• Flexible Output:
  Rail-to-Rail Output
  Separate Output Reference Pin Allows Level Shifting
• Small Size:
  Space Saving 8-Pin MSOP Package

Typical Application

Description

The LTC1967 is a true RMS-to-DC converter that uses an innovative delta-sigma computational technique. The benefits of the LTC1967 proprietary architecture when compared to conventional log-antilog RMS-to-DC converters are higher linearity and accuracy, bandwidth independent of amplitude and improved temperature behavior.

The LTC1967 operates with single-ended or differential input signals (for EMI/RFI rejection) and supports crest factors up to 4. Common mode input range is rail-to-rail. Differential input range is 1V_PEAK, and offers unprecedented linearity. The LTC1967 allows hassle-free system calibration at any input voltage.

The LTC1967 has a rail-to-rail output with a separate output reference pin providing flexible level shifting; it operates on a single power supply from 4.5V to 5.5V. A low power shutdown mode reduces supply current to 0.1µA.

The LTC1967 is packaged in the space-saving MSOP package, which is ideal for portable applications.

Protected under U.S. Patent Numbers 6,359,576, 6,362,677 and 6,516,291