LTC1966IMS8 Datasheet

PMIC - RMS to DC Converters


The LTC1966IMS8 is a true RMS-to-DC converter that utilizesan innovative patentedΣ computational technique. Theinternal delta-sigma circuitry of the LTC1966 makes it sim-pler to use, more accurate, lower power and dramaticallymore flexible than conventional log-antilog RMS-to-DCconverters.The LTC1966IMS8 accepts single ended or differential inputsignals (for EMI/RFI rejection) and supports crest factorsup to 4. Common mode input range is rail-to-rail. Differ-ential input range is 1VPEAK, and offers unprecedented lin-earity. Unlike previously available RMS-to-DC converters,the superior linearity of the LTC1966 allows hassle-freesystem calibration at any input voltage. LTC1966IMS8 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 Voltage800kHz –3dB, 6kHz±1%• Flexible Supplies: 2.7V to 5.5V Single SupplyUp 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 OutputSeparate Output Reference Pin Allows Level Shifting• Small Size:Space Saving 8-Pin MSOP Package LTC1966IMS8 Applications • True RMS Digital Multimeters and Panel Meters• True RMS AC + DC Measurements


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