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LTC1967 Datasheet(PDF) 1 Page - Linear Integrated Systems |
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LTC1967 Datasheet(HTML) 1 Page - Linear Integrated Systems |
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1 / 28 page  1 LTC1967 1967f Precision Extended Bandwidth, RMS-to-DC Converter s High Linearity: 0.02% Linearity Allows Simple System Calibration s Wide Input Bandwidth: Bandwidth to 0.1% Additional Gain Error: 40kHz Bandwidth Independent of Input Voltage Amplitude s No-Hassle Simplicity: True RMS-DC Conversion with Only One External Capacitor Delta Sigma Conversion Technology s Low Supply Current: 330 µA Typ s Ultralow Shutdown Current: 0.1 µA 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 ®1967 is a true RMS-to-DC converter that uses an innovative delta-sigma computational technique. The ben- efits of the LTC1967 proprietary architecture when com- pared to conventional log-antilog RMS-to-DC converters are higher linearity and accuracy, bandwidth independent of amplitude and improved temperature behavior. The LTC1967 operates with single-ended or differential in- put signals (for EMI/RFI rejection) and supports crest fac- tors up to 4. Common mode input range is rail-to-rail. Dif- ferential input range is 1VPEAK, and offers unprecedented linearity. The LTC1967 allows hassle-free system calibra- tion at any input voltage. The LTC1967 has a rail-to-rail output with a separate out- put reference pin providing flexible level shifting; it oper- ates on a single power supply from 4.5V to 5.5V. A low power shutdown mode reduces supply current to 0.1 µA. The LTC1967 is packaged in the space-saving MSOP pack- age, which is ideal for portable applications. Single Supply RMS-to-DC Converter CAVE 1 µF VOUT + – 1967 TA01 4.5V TO 5.5V OUTPUT DIFFERENTIAL INPUT LTC1967 V+ 0.1 µF OPT. AC COUPLING EN GND OUT RTN IN1 IN2 TYPICAL APPLICATIO VIN (mV ACRMS) 0 –1.0 –0.8 –0.6 –0.4 –0.2 0 0.2 100 200 300 400 1967 TA01b 500 LTC1967, ∆Σ 60Hz SINEWAVE CONVENTIONAL LOG/ANTILOG Linearity Performance , LTC and LT are registered trademarks of Linear Technology Corporation. Protected under U.S. Patent Numbers 6,359,576, 6,362,677 and 6,516,291 |
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