LTC1968 Datasheet

• High Linearity:
  • 0.02% Linearity Allows Simple System Calibration
• Wide Input Bandwidth:
  • Bandwidth to 1% Additional Gain Error: 500kHz
  • Bandwidth to 0.1% Additional Gain Error: 150kHz
  • 3dB Bandwidth Independent of Input Voltage Amplitude
• No-Hassle Simplicity:
  • True RMS-DC Conversion with Only One External Capacitor
  • Delta Sigma Conversion Technology
• 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

• True RMS Digital Multimeters and Panel Meters
• True RMS AC + DC Measurements

The LTC1968 is a true RMS-to-DC converter that uses an innovative delta-sigma computational technique. The benefits of the LTC1968 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 LTC1968 operates with single-ended or differential input signals and accurately 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 LTC1968 allows hassle-free system calibration at any input voltage.

The LTC1968 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 LTC1968 is packaged in the space-saving MSOP package, which is ideal for portable applications.