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LTC1966CMS8 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1966CMS8 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  1 LTC1966 sn1966 1966fas Precision Micropower, ∆Σ RMS-to-DC Converter s No-Hassle Simplicity: True RMS-DC Conversion with Only One External Capacitor Delta Sigma Conversion Technology s High Accuracy: 0.1% Gain Accuracy from 50Hz to 1kHz 0.25% Total Error from 50Hz to 1kHz s High Linearity: 0.02% Linearity Allows Simple System Calibration s Low Supply Current: 155 µA Typ, 170µA Max s Ultralow Shutdown Current: 0.1 µA s Constant Bandwidth: Independent of Input Voltage 800kHz –3dB, 6kHz ±1% s Flexible Supplies: 2.7V to 5.5V Single Supply Up to ±5.5V Dual Supply s Flexible Inputs: Differential or Single Ended Rail-to-Rail Common Mode Voltage Range Up to 1VPEAK Differential Voltage s Flexible Output: Rail-to-Rail Output Separate Output Reference Pin Allows Level Shifting s Small Size: Space Saving 8-Pin MSOP Package s True RMS Digital Multimeters and Panel Meters s True RMS AC + DC Measurements DESCRIPTIO FEATURES APPLICATIO S 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 LTC1966 makes it sim- pler 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. 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-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 0.5 µA. 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. Single Supply RMS-to-DC Converter CAVE 1 µF VOUT + – 1966 TA01 2.7V TO 5.5V OUTPUT DIFFERENTIAL INPUT LTC1966 VDD 0.1 µF OPT. AC COUPLING VSS EN GND OUT RTN IN1 IN2 TYPICAL APPLICATIO VIN (mV ACRMS) –1.0 –0.6 –0.2 0.2 –0.8 –0.4 0 100 200 300 400 1966 TA01b 500 50 0 150 250 350 450 LTC1966, ∆Σ 60Hz SINEWAVES CONVENTIONAL LOG/ANTILOG Quantum Leap in Linearity Performance , LTC and LT are registered trademarks of Linear Technology Corporation. Protected under U.S. Patent Numbers 6,359,576 and 6,362,677 |
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