AD641* PRODUCT PAGE QUICK LINKS Last Content Update: 02/23/2017COMPARABLE PARTSDESIGN RESOURCES View a parametric search of comparable parts. • AD641 Material Declaration • PCN-PDN Information DOCUMENTATION • Quality And Reliability Data Sheet • Symbols and Footprints • AD641: 250 MHz Demodulating Logarithmic Amplifier Data Sheet DISCUSSIONS • AD641: Military Data Sheet View all AD641 EngineerZone Discussions. Product Highlight • Industrial Applications SAMPLE AND BUY Visit the product page to see pricing options. TOOLS AND SIMULATIONS • ADIsimPLL™ TECHNICAL SUPPORT • ADIsimRF Submit a technical question or find your regional support number. REFERENCE MATERIALSInformationalDOCUMENT FEEDBACK • ADI Warns Against Misuse of COTS Integrated Circuits Submit feedback for this data sheet. Product Selection Guide • RF Source Booklet • Space Qualified Parts List Technical Articles • Design a Logamp RF Pulse Detector • Detecting Fast RF Bursts using Log Amps • Log Amps and Directional Couplers Enable VSWR Detection • Make Precise Base-Station Power Measurements • Measurement and Control of RF Power, Part I • Measurement and Control of RF Power, Part II • Measurement and Control of RF Power, Part III • Measuring the RF Power in CDMA2000 and W-CDMA High Power Amplifiers (HPAs) • Measuring VSWR and Gain in Wireless Systems This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. A dynamic change to the content on this page will not trigger a change to either the revision number or the content of the product data sheet. This dynamic page may be frequently modified. Document Outline FEATURES PRODUCT DESCRIPTION PIN CONFIGURATIONS AD641--SPECIFICATIONS ELECTRICAL CHARACTERISTICS THERMAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS ESD CAUTION REVISION HISTORY AD641--TYPICAL DC PERFORMANCE CHARACTERISTICS TYPICAL AC PERFORMANCE CHARACTERISTICS CIRCUIT DESCRIPTION CIRCUIT OPERATION FUNDAMENTALS OF LOGARITHMIC CONVERSION INTERCEPT STABILIZATION CONVERSION RANGE EFFECT OF WAVEFORM ON INTERCEPT LOGARITHMIC CONFORMANCE AND WAVEFORM SIGNAL MAGNITUDE INTERCEPT AND LOGARITHMIC OFFSET OPERATION OF A SINGLE AD641 ACTIVE CURENT-TO-VOLTAGE CONVERSION EFFECT OF FREQUENCY ON CALIBRATION SOURCE RESISTANCE AND INPUT OFFSET USING HIGHER SUPPLY VOLTAGES USING THE ATTENUATOR OPERATION OF CASCADED AD641s ELIMINATING THE EFFECT OF FIRST STAGE OFFSET PRACTICAL APPLICATIONS RSSI APPLICATIONS 250 MHz RSSI CONVERTER WITH 58 dB DYNAMIC RANGE OUTLINE DIMENSIONS ORDERING GUIDE