{"id":8344,"date":"2026-06-28T12:26:39","date_gmt":"2026-06-28T12:26:39","guid":{"rendered":"https:\/\/materialparts.com\/ltc1966cms8trpbf\/"},"modified":"2026-06-28T12:26:39","modified_gmt":"2026-06-28T12:26:39","slug":"ltc1966cms8trpbf","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/ltc1966cms8trpbf\/","title":{"rendered":"LTC1966CMS8#TRPBF"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The LTC1966CMS8#TRPBF from Analog Devices is a precision micropower delta-sigma RMS-to-DC converter in an 8-lead MSOP package. Using a patented delta-sigma computational technique, it achieves 0.1% gain accuracy from 50 Hz to 1 kHz and 0.02% linearity while consuming only 155 \u00b5A supply current, requiring just a single external capacitor for operation.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
Gain Accuracy<\/td>\n0.1% (50 Hz to 1 kHz)<\/td>\n<\/tr>\n
Total Error<\/td>\n0.25% (50 Hz to 1 kHz)<\/td>\n<\/tr>\n
Linearity<\/td>\n0.02%<\/td>\n<\/tr>\n
Bandwidth (-3 dB)<\/td>\n800 kHz<\/td>\n<\/tr>\n
Supply Current<\/td>\n155 \u00b5A (typ)<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0625\u064a\u0642\u0627\u0641 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n0.1 \u00b5A<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n2.7 V to 5.5 V single, or up to +\/-5.5 V dual<\/td>\n<\/tr>\n
Crest Factor Support<\/td>\nUp to 4<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n0\u00b0C to +70\u00b0C (C-grade)<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\n8-MSOP<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Patented delta-sigma RMS computation eliminates log-antilog errors<\/li>\n
  • 0.02% linearity enables simple system calibration at any input voltage<\/li>\n
  • Rail-to-rail input common mode and differential input support<\/li>\n
  • Separate output reference pin for flexible level shifting<\/li>\n
  • Only one external averaging capacitor required<\/li>\n
  • Ultralow 0.1 \u00b5A shutdown current<\/li>\n
  • Insensitive to PCB soldering stresses and temperature<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • True RMS digital multimeters and panel meters<\/li>\n
    • AC + DC true RMS measurements<\/li>\n
    • Power monitoring and energy metering<\/li>\n
    • Audio level detection and VU metering<\/li>\n
    • Variable-speed drive current sensing<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LTC1966CMS8#TRPBF from Analog Devices is a precision micropower delta-sigma RMS-to-DC converter in an 8-lead MSOP package. Using a patented delta-sigma computational technique, it achieves 0.1% gain accuracy from 50 Hz to 1 kHz and 0.02% linearity while consuming only 155 \u00b5A supply current, requiring just a single external capacitor for operation. Key […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,13],"tags":[],"chip_brand":[165],"class_list":["post-8344","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-adi"],"acf":{"brief_explanation":"Precision delta-sigma RMS-to-DC converter, 0.1% accuracy, 800kHz BW, 155uA Iq, MSOP-8","date_code":"","package_case":"MSOP-8 (3.00 x 3.00 x 0.85 mm)","in_stock":13411,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/1966fb.pdf","price":"$4.47 @ 1ku","product_introduction":"The LTC1966CMS8#TRPBF is a precision micropower RMS-to-DC converter from Analog Devices that uses an innovative patented delta-sigma computational technique instead of conventional log-antilog methods. This approach delivers 0.1% gain accuracy from 50 Hz to 1 kHz, 0.25% total error, and 0.02% linearity, enabling simple single-point system calibration. The device accepts single-ended or differential input signals with rail-to-rail common mode range and supports crest factors up to 4. The rail-to-rail output features a separate reference pin for flexible level shifting. Operating from a 2.7 V to 5.5 V single supply or up to +\/-5.5 V dual supplies, the LTC1966 draws only 155 \u00b5A typical supply current and features a 0.1 \u00b5A shutdown mode. The 800 kHz -3 dB bandwidth is constant and independent of input voltage, a significant advantage over log-antilog converters. Packaged in a space-saving 8-lead MSOP, it requires only one external averaging capacitor.","working_principle":"The LTC1966 employs a delta-sigma modulator as the computational core for RMS-to-DC conversion, replacing traditional log-antilog circuits. The input signal is applied to a second-order delta-sigma modulator whose reference is derived from the output voltage. The modulator produces a single-bit stream whose average duty cycle equals VIN\/VOUT. This bit stream controls a polarity switch that selectively buffers or inverts the input signal, effectively performing the multiplication VIN x (VIN\/VOUT) = VIN^2\/VOUT before a low-pass averaging filter. The steady-state output satisfies VOUT = RMS(VIN), completing the implicit RMS computation. Unlike log-antilog methods, the delta-sigma approach operates at only two gain states (+1 and -1), providing exceptional linearity of 0.02% that is independent of amplitude. The low-pass filter is implemented with a single external capacitor across the high-impedance (85 kohm) output, and its corner frequency determines the measurement bandwidth and settling time.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>VDD<\/td>Power<\/td>Positive supply voltage (2.7 V to 5.5 V)<\/td><\/tr>
      2<\/td>IN1<\/td>Input<\/td>Differential input, non-inverting (VIN+)<\/td><\/tr>
      3<\/td>IN2<\/td>Input<\/td>Differential input, inverting (VIN-)<\/td><\/tr>
      4<\/td>VSS<\/td>Power<\/td>Negative supply (GND for single supply, -5.5 V max for dual)<\/td><\/tr>
      5<\/td>OUTRTN<\/td>Output<\/td>Output return (reference) pin for level shifting<\/td><\/tr>
      6<\/td>OUT<\/td>Output<\/td>RMS DC output voltage<\/td><\/tr>
      7<\/td>CAVE<\/td>Output<\/td>Averaging capacitor connection (connect to OUT via external cap)<\/td><\/tr>
      8<\/td>ENABLE<\/td>Input<\/td>Shutdown control; high = active, low = shutdown (0.1 \u00b5A)<\/td><\/tr><\/table>","application_scenarios":"
      • Digital Multimeters<\/strong>: True RMS AC voltage and current measurement in handheld and bench DMMs<\/li>
      • Power Monitoring<\/strong>: Real-time RMS current and voltage measurement in energy metering systems<\/li>
      • Audio Level Detection<\/strong>: VU metering and audio signal RMS level measurement in professional audio equipment<\/li>
      • Industrial Process Control<\/strong>: Variable-speed drive current sensing and motor load monitoring<\/li>
      • AC + DC RMS Measurement<\/strong>: Combined AC and DC RMS measurement in precision instrumentation<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Accuracy<\/th>Bandwidth<\/th>Supply<\/th>Package<\/th>Notes<\/th><\/tr>
        LTC1967IMS8#TRPBF<\/td>Analog Devices<\/td>0.1%<\/td>800 kHz<\/td>2.7-5.5 V<\/td>MSOP-8<\/td>Industrial temp range<\/td><\/tr>
        AD736JRZ<\/td>Analog Devices<\/td>0.3%<\/td>400 kHz<\/td>2.8-16.5 V<\/td>SOIC-8<\/td>Log-antilog, wider supply<\/td><\/tr>
        AD8436JCPZ<\/td>Analog Devices<\/td>0.1%<\/td>1 MHz<\/td>2.7-12 V<\/td>LFCSP-16<\/td>Higher bandwidth<\/td><\/tr>
        LTC1966HMS8#TRPBF<\/td>Analog Devices<\/td>0.1%<\/td>800 kHz<\/td>2.7-5.5 V<\/td>MSOP-8<\/td>Extended temp -40 to 125C<\/td><\/tr>
        MX536AJCWE<\/td>Maxim (ADI)<\/td>0.2%<\/td>600 kHz<\/td>4-36 V<\/td>SOIC-16<\/td>Log-antilog legacy part<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/8344","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=8344"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/8344\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=8344"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=8344"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=8344"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=8344"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}