LF to 2.5 GHz TruPwr Detector Data Sheet AD8361 FEATURES FUNCTIONAL BLOCK DIAGRAMS Calibrated rms response VPOS INTERNAL FILTER i Excellent temperature stability 2 RFIN FLTR Up to 30 dB input range at 2.5 GHz TRANS- AD8361 CONDUCTANCE 700 mV rms, 10 dBm, re 50 maximum input CELLS ERROR i AMP 0.25 dB linear response up to 2.5 GHz 2 7.5 VRMS BUFFER Single-supply operation: 2.7 V to 5.5 V ADD Low power: 3.3 mW at 3 V supply OFFSET BAND-GAP PWDN SREF Rapid power-down to less than 1 A REFERENCE COMM APPLICATIONS IREF Measurement of CDMA, W-CDMA, QAM, other complex modulation waveforms Figure 2. 8-Lead MSOP RF transmitter or receiver power measurement VPOS INTERNAL FILTER i 2 RFIN FLTR GENERAL DESCRIPTION TRANS- AD8361 CONDUCTANCE CELLS The AD8361 is a mean-responding power detector for use in ERROR i AMP 2 7.5 high frequency receiver and transmitter signal chains, up to VRMS BUFFER 2.5 GHz. It is very easy to apply. It requires a single supply only between 2.7 V and 5.5 V, a power supply decoupling capacitor, BAND-GAP PWDN REFERENCE and an input coupling capacitor in most applications. The COMM output is a linear-responding dc voltage with a conversion gain of 7.5 V/V rms. An external filter capacitor can be added to IREF increase the averaging time constant. Figure 3. 6-Lead SOT-23 3.0 2.8 The AD8361 is intended for true power measurement of simple SUPPLY 2.6 REFERENCE MODE and complex waveforms. The device is particularly useful for 2.4 measuring high crest-factor (high peak-to-rms ratio) signals, 2.2 INTERNAL 2.0 such as CDMA and W-CDMA. REFERENCE MODE 1.8 The AD8361 has three operating modes to accommodate a 1.6 1.4 variety of analog-to-digital converter requirements: GROUND 1.2 REFERENCE MODE 1. Ground reference mode, in which the origin is zero. 1.0 0.8 2. Internal reference mode, which offsets the output 350 mV 0.6 above ground. 0.4 0.2 3. Supply reference mode, which offsets the output to VS/7.5. 0.0 0 The AD8361 is specified for operation from 40C to +85C 0.1 0.2 0.3 0.4 0.5 RFIN (V rms) and is available in 8-lead MSOP and 6-lead SOT-23 packages. It Figure 1. Output in the Three Reference Modes, Supply 3 V, Frequency 1.9 GHz is fabricated on a proprietary high f silicon bipolar process. T (6-Lead SOT-23 Package Ground Reference Mode Only) Rev. F Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 19992015 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 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Technical Support www.analog.com V rms (Volts) 01088-C-001 01088-C-003 01088-C-002AD8361 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................6 Applications ....................................................................................... 1 Circuit Description......................................................................... 11 General Description ......................................................................... 1 Application Information ................................................................ 12 Functional Block Diagrams ............................................................. 1 Output Reference Temperature Drift Compensation ........... 16 Revision History ............................................................................... 2 Evaluation Board ............................................................................ 19 Specifications ..................................................................................... 3 Characterization Setups............................................................. 21 Absolute Maximum Ratings ............................................................ 4 Outline Dimensions ....................................................................... 22 ESD Caution .................................................................................. 4 Ordering Guide .......................................................................... 22 Pin Configuration and Function Descriptions ............................. 5 REVISION HISTORY 7/15Rev. E to Rev. F 8/04Rev. B to Rev. C Change to Ordering Guide ............................................................ 22 Changed Trimpots to Trimmable Potentiometers ......... Universal Changes to Specifications ................................................................. 3 5/15Rev. D to Rev. E Changed Using the AD8361 Section Title to Applications ....... 12 Deleted Dynamic Range Extension for the AD8361 Section, Changes to Figure 43...................................................................... 14 Figure 60, Renumbered Sequentially ........................................... 19 Changes to Ordering Guide .......................................................... 24 Deleted Figure 61, Figure 62, Figure 63, and Figure 64 ............ 20 Updated Outline Dimensions ....................................................... 24 3/14Rev. C to Rev. D Changes to Ordering Guide .......................................................... 24 Updated Outline Dimensions ....................................................... 24 Rev. F Page 2 of 22