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LTC1968IMS8 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1968IMS8 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC1968 1968f Precision Wide Bandwidth, RMS-to-DC Converter ■ High Linearity: 0.02% Linearity Allows Simple System Calibration ■ Wide Input Bandwidth: Bandwidth to 1% Additional Gain Error: 500kHz Bandwidth to 0.1% Additional Gain Error: 150kHz 3dB Bandwidth Independent of Input Voltage Amplitude ■ No-Hassle Simplicity: True RMS-DC Conversion with Only One External Capacitor Delta Sigma Conversion Technology ■ Ultralow Shutdown Current: 0.1µA ■ 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 ■ True RMS Digital Multimeters and Panel Meters ■ True RMS AC + DC Measurements DESCRIPTIO FEATURES APPLICATIO S The LTC ®1968 is a true RMS-to-DC converter that uses an innovative delta-sigma computational technique. The ben- efits of the LTC1968 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 LTC1968 operates with single-ended or differential in- put signals and accurately supports crest factors up to 4. Common mode input range is rail-to-rail. Differential in- put range is 1VPEAK,andoffersunprecedentedlinearity.The LTC1968 allows hassle-free system calibration at any in- put voltage. The LTC1968 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 0.1µA. The LTC1968 is packaged in the space-saving MSOP pack- age, which is ideal for portable applications. Single Supply RMS-to-DC Converter CAVE 10µF VOUT + – 1968 TA01 4.5V TO 5.5V OUTPUT DIFFERENTIAL INPUT LTC1968 V+ 0.1µF 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 1968 TA01b 500 LTC1968, ∆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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