The LTC® 1966 is a true RMS-to-DC converter that utilizes an innovative patented ∆Σ computational technique. The internal delta-sigma circuitry of the LTC1966IMS8 makes it simpler to use, more accurate, lower power and dramatically more flexible than conventional log-antilog RMS-to-DC converters.
The LTC1966IMS8 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 1VPEAK, and offers unprecedented linearity. Unlike previously available RMS-to-DC converters, the superior linearity of the LTC1966IMS8 allows hassle-free system calibration at any input voltage.
The LTC1966IMS8 also has a rail-to-rail output with a separate output reference pin providing flexible level shifting. The LTC1966IMS8 operates on a single power supply from 2.7V to 5.5V or dual supplies up to ±5.5V. A low power shutdown mode reduces supply current to 0.5µA.
The LTC1966IMS8 is insensitive to PC board soldering and stresses, as well as operating temperature. The LTC1966 is packaged in the space-saving MSOP package which is ideal for portable applications.
Features
■ No-Hassle Simplicity:
- True RMS-DC Conversion with Only One External
- Capacitor
- Delta Sigma Conversion Technology
■ High Accuracy:
- 0.1% Gain Accuracy from 50Hz to 1kHz
- 0.25% Total Error from 50Hz to 1kHz
■ High Linearity:
- 0.02% Linearity Allows Simple System Calibration
■ Low Supply Current:
- 155µA Typ, 170µA Max
■ Ultralow Shutdown Current:
- 0.1µA
■ Constant Bandwidth:
- Independent of Input Voltage
- 800kHz –3dB, 6kHz ±1%
■ Flexible Supplies:
- 2.7V to 5.5V Single Supply
- Up to ±5.5V Dual Supply
■ Flexible Inputs:
- Differential or Single Ended
- Rail-to-Rail Common Mode Voltage Range
- Up to 1VPEAK Differential Voltage
■ Flexible Output:
- Rail-to-Rail Output
- Separate Output Reference Pin Allows Level Shifting
■ Small Size:
- Space Saving 8-Pin MSOP Package
Applications
• Military and Industrial Data Acquisition Systems
• Electronic Test and Scientific Instrumentation
• Process Control Systems
Feature
- Simple to Use, Requires One Capacitor
- True RMS DC Conversion Using ∆Σ Technology
- High Accuracy:
- 0.1% Gain Accuracy from 50Hz to 1kHz
- 0.25% Total Error from 50Hz to 1kHz
- High Linearity:
- 0.02% Linearity Allows Simple System Calibration
- Low Supply Current:
- 155μA Typ, 170μA Max
- Ultralow Shutdown Current:
- 0.1μA
- Constant Bandwidth:
- Independent of Input Voltage
- 800kHz –3dB, 6kHz ±1%
- Flexible Supplies:
- 2.7V to 5.5V Single Supply
- Up to ±5.5V Dual Supply
- Flexible Inputs:
- Differential or Single-Ended
- Rail-to-Rail Common Mode Voltage Range
- Up to 1VPEAK Differential Voltage
- Flexible Output:
- Rail-to-Rail Output
- Separate Output Reference Pin Allows Level Shifting
- Wide Temperature Range:
- –55°C to 125°C
- Small Size:
- Space Saving 8-Pin MSOP Package
Applications
- True RMS Digital Multimeters and Panel Meters
- True RMS AC + DC Measurements
(Picture: Pinout)
