LTC1966 RMS-to-DC Converter with ∆Σ Technology

LTC1966 RMS-to-DC Converter with ∆Σ Technology

LTC’s LTC1966 power management integrated circuit (PMIC) is a true RMS-to-DC converter that uses ∆Σ (delta sigma) technology. The internal delta sigma circuitry of the LTC1966 makes it simpler to use, more accurate, lower power, and dramatically more flexible than conventional log analog RMS-to-DC converters. This converter accepts 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 1 VPEAK, and offers unprecedented linearity. The LTC1966 also has a rail-to-rail output with a separate output reference pin providing flexible level shifting. The converter operates on a single power supply from 2.7 V to 5.5 V or dual supplies up to 5.5 V. A low power shutdown mode reduces supply current to 0.5 μA. The LTC1966 is ideal for precision multimeters, panel meters, and true RMS measurements of AC and DC applications.

Features
  • Ease of use, requires one capacitor
  • High accuracy:
    • 0.1% gain accuracy from 50 Hz to 1 kHz
    • 0.25% total error from 50 Hz to 1 kHz
  • High linearity: 0.02%
  • Voltage supply: 2.7 V to 5.5 V
  • Current supply: 155 µA
  • Temperature operating range: -55°C to +125°C
  • Package/case: 8-MSOP
Applications
  • Precision multimeters
  • Panel meters
  • True RMS measurements of AC and DC
Manufacturer