LTC1966: Precision Micropower ΔΣ RMS-to-DC Converter Data Sheet5/18/2011391K
Features and Benefits
- 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:
- 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
The LTC1966 is a true RMS-to-DC converter that utilizes an innovative patented ∆Σ computational technique. The internal delta sigma circuitry of the LTC1966 makes it simpler to use, more accurate, lower power and dramatically more flexible than conventional log antilog RMS-to-DC converters.
The LTC1966 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 LTC1966 allows hassle free system calibration at any input voltage.
The LTC1966 also has a rail-to-rail output with a separate output reference pin providing flexible level shifting. The LTC1966 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 LTC1966 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.
- True RMS Digital Multimeters and Panel Meters
- True RMS AC + DC Measurements
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
DC427B-A: Demo Board for the LTC1966 Precision Micropower, Delta Sigma RMS-to-DC Converter.
Documentation & Resources
R448 Reliability Data3/26/201820 K
AN106 - Instrumentation Circuitry Using RMS-to-DC Converters10/15/2007345K
AN-105: Current Sense Circuit Collection Making Sense of Current12/1/2005
DC427B - Demo Manual9/24/2009153K
DN339 - An Autoranging True RMS Converter8/6/201475K
DN288 - RMS-to-DC Conversion Just Got Easy8/6/201480K
Tools & Simulations
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Models for the following parts are available in LTspice:
LTC1966 Companion Parts
Recommended Related Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LTC1966CMS8#PBF||Material Declaration||Reliability Data||8-Lead MSOP|
|LTC1966CMS8#TRPBF||Material Declaration||Reliability Data||8-Lead MSOP|
|LTC1966HMS8#PBF||Material Declaration||Reliability Data||8-Lead MSOP|
|LTC1966HMS8#TRPBF||Material Declaration||Reliability Data||8-Lead MSOP|
|LTC1966IMS8#PBF||Material Declaration||Reliability Data||8-Lead MSOP|
|LTC1966IMS8#TRPBF||Material Declaration||Reliability Data||8-Lead MSOP|
|LTC1966MPMS8#PBF||Material Declaration||Reliability Data||8-Lead MSOP|
|LTC1966MPMS8#TRPBF||Material Declaration||Reliability Data||8-Lead MSOP|
|Wafer Fabrication Data||R448 Reliability Data|
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.